iM 4,1-14,4 EnableGop: Pre-OpenCore GOP support for EFI-era iMacs and Mac Pros

Macschrauber · Feb 7, 2024

webtrialsgeek said:
Unfortunately, pulling everything gave the same result. Nothing. Currently running on hdmi, I might try and borrow a displayport cable and see if that makes a difference (earlier in the thread someone had the issue on displayport but resolved on hdmi)

If I put the oc drive back in it gets to the opencore boot picker no problem and if I hold option beforehand it gets to the apple boot picker (doesn’t progress to the oc picker) but no signal to the monitor.

Is it possible my gpu has non standard firmware? (How can I check?) Can you flash the enablegopdirect.ffs to the bootrom?

Sounds like the GPU gives a wrong resolution to the monitor. You might try to power circle when you are in this ‚invisible bootpicker‘.

Bmju · Feb 8, 2024

startergo said:
Are you keeping pressed the Option (⌥) key during start up? If Yes you might have not flashed the upgraded firmware . You need to enter programming mode on the cMP to be able to flash the firmware.

@webtrialsgeek - If it works in OpenCore then it should work in the firmware. @startergo 's answer seems best to me. Are you absolutely sure you've successfully burnt the updated ROM to the firmware? And are you pressing and holding the alt/option key for long enough? Timing might matter too, start to press and hold it as soon as you hear the first sound of the chime (assuming you have a chime) and then keep holding it for potentially a loooooong time (not just until the screen flashes, but until some icons appear).

startergo · Feb 8, 2024

One can also inspect the loaded UEFI drivers in openshell environment.

Code:

dh -d -v -b

should display loaded drivers one screen at a time.

Code:

dh -d -v > drivers.txt

Should record all loaded drivers in a file drivers.txt

webtrialsgeek · Feb 9, 2024

Using the dump rom app shows the enablegop module in there, so I guess its there. The flash and check were successful.

cycling the monitor in the invisible bootpicker doesn't do anything either, haven't found a displayport cable so can't try that yet (not that I think that will help).

EDIT: interestingly, I just updated opencore to 1.3 and now my legacy windows install is showing up in the OC bootpicker (yes definitely the oc one!) and it worked to get into windows - have they added legacy windows support, or what is going on here ?! 🤣

startergo · Feb 9, 2024

webtrialsgeek said:
have they added legacy windows support

OpenCorePkg/Include/Apple/IndustryStandard/AppleFeatures.h at f61841445b99f40c01af45acaa29db9cd59a81db · acidanthera/OpenCorePkg

OpenCore bootloader. Contribute to acidanthera/OpenCorePkg development by creating an account on GitHub.

github.com

tsialex · Feb 10, 2024

webtrialsgeek said:
Using the dump rom app shows the enablegop module in there, so I guess its there. The flash and check were successful.

cycling the monitor in the invisible bootpicker doesn't do anything either, haven't found a displayport cable so can't try that yet (not that I think that will help).

EDIT: interestingly, I just updated opencore to 1.3 and now my legacy windows install is showing up in the OC bootpicker (yes definitely the oc one!) and it worked to get into windows - have they added legacy windows support, or what is going on here ?! 🤣

You can reset the NVRAM with your keyboard?

Some keyboards, even some Apple keyboards does not work for pre-boot configuration support with a MacPro5,1, like this first generation Apple Keyboard with Numerical Keys made from August 2007 to sometime in 2008 that does not work for pre-boot configuration support with a MacPro5,1, the issue is the ProductId 0x0220 with 0.69 firmware:

Code:

Apple Keyboard:

  Product ID:    0x0220
  Vendor ID:    0x05ac (Apple Inc.)
  Version:     0.69
  Speed:    Up to 1.5 Mb/s
  Manufacturer:    Apple, Inc
  Location ID:    0xfd120000 / 4
  Current Available (mA):    100
  Current Required (mA):    20

This second (or third?!?) generation with ProductID 0x024f and firmware 0.74 works perfectly:

Code:

Apple Keyboard:

  Product ID:	0x024f
  Vendor ID:	0x05ac (Apple Inc.)
  Version:	0.74
  Speed:	Up to 1.5 Mb/s
  Manufacturer:	Apple Inc.
  Location ID:	0xfa232000 / 4
  Current Available (mA):	500
  Current Required (mA):	20
  Extra Operating Current (mA):	0

There are other keyboards made by Apple that have issues with pre-boot configuration support with a MacPro5,1 too, but AFAIK no one compiled a list.

Macschrauber · Feb 10, 2024

tsialex said:
You can reset the NVRAM with your keyboard?

Some keyboards, even some Apple keyboards does not work for pre-boot configuration support with a MacPro5,1, like this first generation Apple Keyboard with Numerical Keys made from August 2007 to sometime in 2008 that does not work for pre-boot configuration support with a MacPro5,1, the issue is the 0.69 firmware:

Code:

Apple Keyboard: Product ID: 0x0220 Vendor ID: 0x05ac (Apple Inc.) Version: 0.69 Speed: Up to 1.5 Mb/s Manufacturer: Apple, Inc Location ID: 0xfd120000 / 4 Current Available (mA): 100 Current Required (mA): 20

This second generation with ProductID 0x024f and firmware 0.74 works perfectly:

Code:

Apple Keyboard: Product ID: 0x024f Vendor ID: 0x05ac (Apple Inc.) Version: 0.74 Speed: Up to 1.5 Mb/s Manufacturer: Apple Inc. Location ID: 0xfa232000 / 4 Current Available (mA): 500 Current Required (mA): 20 Extra Operating Current (mA): 0

There are other keyboards made by Apple that have issues with pre-boot configuration support with a MacPro5,1 too.

But, seems not the 0.69 firmware alone is for this.

Here is a 0x0221 Product ID (German) Keyboard what I use for a long time on my test box, of course with continuous use of preboot keys:

Code:

Apple Keyboard:

  Product ID:	0x0221
  Vendor ID:	0x05ac (Apple Inc.)
  Version:	0.69
  Speed:	Up to 1.5Mb/sec
  Manufacturer:	Apple, Inc
  Location ID:	0x14113200 / 26
  Current Available (mA):	500
  Current Required (mA):	20
  Extra Operating Current (mA):	0

tsialex · Feb 10, 2024

Macschrauber said:
But, seems not the 0.69 firmware alone is for this.

Here is a 0x0221 Product ID (German) Keyboard what I use for a long time on my test box, of course with continuous use of preboot keys:

Code:

Apple Keyboard: Product ID: 0x0221 Vendor ID: 0x05ac (Apple Inc.) Version: 0.69 Speed: Up to 1.5Mb/sec Manufacturer: Apple, Inc Location ID: 0x14113200 / 26 Current Available (mA): 500 Current Required (mA): 20 Extra Operating Current (mA): 0

Yes, ProductId 0x0220 with firmware 0.69, I forgot to add that. I'll edit the post.

webtrialsgeek · Feb 14, 2024

tsialex said:
You can reset the NVRAM with your keyboard?

Some keyboards, even some Apple keyboards does not work for pre-boot configuration support with a MacPro5,1, like this first generation Apple Keyboard with Numerical Keys made from August 2007 to sometime in 2008 that does not work for pre-boot configuration support with a MacPro5,1, the issue is the ProductId 0x0220 with 0.69 firmware:

Code:

Apple Keyboard: Product ID: 0x0220 Vendor ID: 0x05ac (Apple Inc.) Version: 0.69 Speed: Up to 1.5 Mb/s Manufacturer: Apple, Inc Location ID: 0xfd120000 / 4 Current Available (mA): 100 Current Required (mA): 20

This second (or third?!?) generation with ProductID 0x024f and firmware 0.74 works perfectly:

Code:

Apple Keyboard: Product ID: 0x024f Vendor ID: 0x05ac (Apple Inc.) Version: 0.74 Speed: Up to 1.5 Mb/s Manufacturer: Apple Inc. Location ID: 0xfa232000 / 4 Current Available (mA): 500 Current Required (mA): 20 Extra Operating Current (mA): 0

There are other keyboards made by Apple that have issues with pre-boot configuration support with a MacPro5,1 too, but AFAIK no one compiled a list.

yeah I can reset the Nvram no problem, Im using a generic usb keyboard as the apple bt one never works before it makes it into macOS. Im pretty sure its getting to the bootpicker, I just can't see it. Its annoying for things like Nvram resets when it no longer goes straight into open core, but now that oc supports my legacy win10 install its kind of ok. I tried the display port - same thing and my monitor has no DVI port on it. I don't really want to reflash the boot rom so for now - Thankyou everyone for the replies.

Bmju · Feb 15, 2024

webtrialsgeek said:
So Ive got a MacPro 5,1, that I used to run Mojave and Win10 with a legacy install that I could switch between the two with the bootcamp bits. For whatever reason I had to upgrade to Monterey using open core legacy patcher. That worked fine but I lost the ability to switch between windows and macOS easily...

I have an rx580 4GB card and it shows the open core bootpicker with Enable AMD GOP in the settings for open core, so I thought I could do the bootrom enablegop injection to get the pre open core picker to have easy switching again. I used the Macschrauber Rom dump with dosdude DXEInject to insert the Enablegop1.4.ffs into the bottom and it all flashed ok. a rescan of the bootrom shows it in there - "EnableGop 1.4 EFI module identified". But Im not getting anything before the open core boot picker any ideas?

Someone else has kindly pointed out to me (finally, sorry!) that the issue here is Enable AMD GOP in OCLP. If that is required to get a menu in OpenCore on your card, then it won't work as-is before OpenCore with EnableGop. Your card needs the GOP driver on it in order to work pre-OpenCore. Apparently GopUpdater from WinRAID is what you need. (After which EnableGop should work, and you wouldn't need Enable AMD GOP in OCLP any more, either.)

toke lahti · Feb 15, 2024

h9826790 said:
A few members asked about any guide to flash the Mac Pro 5,1 with EnableGop. TBH, the readme file contain all the required info already, but it seems some users perfer a more detailed guidence. So, I would like to make a more "step by step" guide here about how to create the ROM, double check, and flash it etc.

This is not the only way to do it, and it's a bit over complicated. However, this procedure contain a lot of safety precausions and checking steps. Therefore, if you straightly follow this guide. The risk of bricking the cMP should be very low.

A)

Before start, the user is recommended to download all these

ROMTool (credit to dosdude. Password to unzip is rom)

UEFITool (credit to LongSoft)

DXEInject (credit to dosdude)

Hex Friend (credit to kainjow)

RomDump Macschrauber (credit to Macschrauber)

EnableGop.ffs (credit to Bmju, unzip the file, then go to Utilities/EnableGop)

B)

Prepare your Mac Pro 5,1's ROM image. Ideally, you already has a clean / reconstructed 144.0.0.0.0 ROM image to start with. Then you can skip this section, and jump to section C below. Otherwise, there are few ways to dump the existing ROM, but the recommended way in this post is to use RomDump Macschrauber.

When you open the DMG file, you should see something like this. All we need is just run the app.View attachment 2196376

When you run the app, you should see something like this, the default option should be backup firmware, just press "Enter" to continue
View attachment 2196377

It will show you a window about require admin password, please follow the onsreen instruction and enter your admin password. Depends on your Gatekeeper setting. macOS may ask you to restart your cMP.
View attachment 2196378

Then RomDump will read the ROM image from the chip, and save it in your Download folder
View attachment 2196379

Once it's done, you should see something like this
View attachment 2196380

As you can see, the file name is XXXXXXXXXXXX_144.0.0.0.0_Gop_SST25VF032B_DD.DD.DDDD_TT-TT-TT.bin in my case. Your dump will have a different name (XXXXXXXXXXXX is the full serial number of your Mac, DD.DD.DDDD is the date, TT-TT-TT is the time).

In finder, right click the bin file, and select "Get Info", check the file size, it MUST be 4,194,304 bytes. If not, something is wrong. Stop here.

Apart from that, please take some time to read the report.

The firmware MUST be 144.0.0.0.0. If NOT, stop here, update your cMP's BootROM first.

There should be zero Microsoft certificates. If NOT, stop here, fix the bootROM first. My suggestion is to request help in this thread.

Similarly, check the BootROM's free space. In my case, 25190 avail. If that's lower than 20000, please perform a 4x NVRAM reset, then re-do step B1-B5 to dump the ROM, and check again. If the free space still low, then something is wrong, please go to this thread and ask for help.

Since I've already flashed by cMP. Therefore, in my example, EnableGopDirect 1.2 is already there. In your case, it shouldn't be there yet.

C)

Once you have the original 144.0.0.0.0 BootROM ready, we can start to patch the ROM

In Finder, we open a new folder inside the download folder, and name it EnableGopROM

Move your 144.0.0.0.0 ROM image (e.g. the bin file dump from step B5) into the EnableGopROM folder

Rename the bin file to 144.bin

Move DXEInject to the EnableGopROM folder

Move EnableGop.ffs (or EnableGopDirect.ffs if required) to the EnableGopROM folder

The result should looks like this
View attachment 2196473

Open Terminal

enter "cd " (cd with a space)

drag the EnableGopROM folder into the terminal window

It should looks like this
View attachment 2196471

Press enter
View attachment 2196472

Enter the following command into terminal (please enter the exact file name of EnableGop.ffs, e.g. including the version number if EnableGop.ffs is updated)

Code:

./DXEInject 144.bin 144Gop.bin EnableGop.ffs

Nothing will return in terminal. However, if you check your EnableGopROM folder now, you will see the new 144Gop.bin file is created
View attachment 2196476

D)

Now we can varify if the 144Gop.bin is created correctly

Open the UEFITool

Drag the 144Gop.bin into the UEFITool window
View attachment 2196485

Press Command + F to bring up the search window

Choose GUID

Choose Header only

enter BAE7599F-3C6B-43B7-BDF0-9CE07AA91AA6
View attachment 2196487

press OK

Double-click on the search result (the blue line in the screen capture)
View attachment 2196491

As you can see from the above screen capture, the BAE7599F... entry will be highlighted automatically. This is NOT what we want. Instead, we expend the one BELOW it (3FBA58B1....), then you should able to see the User interface section. Click this line, and you should able to see the EnableGop version in the right hand side window. [The link in this post already updated to EnableGop 1.4]
View attachment 2196495

This is the first check. And now we can close UEFITool, and go for the second check

Go back to the Macschrauber's CMP Rom Dump dmg, double click the test_nvram.app
View attachment 2196502

Drag 144Gop.bin into the window
View attachment 2196503

Click Choose, wait for a few seconds, then you should see the result
View attachment 2196504

In the above example, I inject the EnableGop 1.3 on top of my existing ROM dump that already has EnableGopDirect 1.2. Therefore, both entries show up. But in your case, there should be one and only one entry related to EnableGop(Direct). If not, delete the 144Gop.bin, do NOT use it. And start from the beginning again. If you start from a clean / reconstructed ROM, the final result should looks like this
View attachment 2196511

Last but not least, check the 144Gop.bin file size in Finder, it MUST be exactly 4,194,304 bytes

With this triple checks, the 144Gop.bin should be safe to use.

E)

We can now flash the Mac.

Shutdown the Mac

Press and HOLD power button to turn on the Mac. Do NOT release the power button until the long beep (after the normal start up chime) is finished.

Once the beep sound completed, you can release the power button, and let the cMP boot back to normal desktop again.

Open ROMTool (RomDump Macschrauber should able to do the same thing. But we use ROMTool here).

Select Dump System ROM, enter password as per on screen instruction, and save your existing ROM image (as backup)
View attachment 2196515

Select Flash System ROM

Drag 144Gop.bin into the window
View attachment 2196516

Click Open

It will ask you to put the Mac into firmware flashing mode, which should be done already
View attachment 2196521

Click Continue, and enter admin password as per onscreen instrcution, let it finish the job. Do NOT use your computer to do anything, do not browse the web, do not play video / music. Please just don't do anything and wait for a few seconds.

Once it's done. Do NOT reboot your Mac. It's our last chance to fix the problem if we did anything wrong.

F)

Final check before reboot.

Re-do steps B1-B5. Now, you should see EnableGop(Direct) is detected in step B5

Open Hex Freind

drag 144Gop.bin into the window
View attachment 2196523

Press Command + O

Drag the latest dump from step F1 into the window

Click Open

Press Command + Shift + D

You should see "Documents are identical"
View attachment 2196528

This should be good enough to confirm the ROM is correctly flashed

If any of the steps above shows abnormal result (e.g. no EnableGop detected in step F1, or the documents are not identical in step F8), do NOT reboot. But flash the Untitled.bin (from step E5) back into the cMP. This is the last known good bootable ROM.

[N.B. If you flash Untitled.bin back into the cMP, please use RomDump Macschrauber to dump the ROM, and use Hex Friend to compare this dump vs Untitled.bin. They should be identical]

Never ever shutdown / reboot your Mac until you get this "Documents are identical". This is your final safety net.

F) Reboot. And now your cMP should able to give you native UEFI GOP boot screen

Does this "Enable GOP" method only affects to GPU card's bios/efi or does it do something to Macs EFI?
Maybe this could be cleared out at least in the second sentence of the guide?
"WHAT IT DOES TO WHAT"?

Bmju · Feb 15, 2024

toke lahti said:
Does this "Enable GOP" method only affects to GPU card's bios/efi or does it do something to Macs EFI?
Maybe this could be cleared out at least in the second sentence of the guide?
"WHAT IT DOES TO WHAT"?

OpenCorePkg/Staging/EnableGop at master · acidanthera/OpenCorePkg

OpenCore bootloader. Contribute to acidanthera/OpenCorePkg development by creating an account on GitHub.

github.com

"The driver may be installed to vBIOS or to main firmware. It is expected that most Mac Pro users will use firmware insertion and most iMac users will chose vBIOS insertion, however both techniques work on both systems (but it is harder to modify the iMac firmware, since there is no simple way to enable writing to it)."

Macschrauber · Feb 15, 2024

toke lahti said:
Does this "Enable GOP" method only affects to GPU card's bios/efi or does it do something to Macs EFI?
Maybe this could be cleared out at least in the second sentence of the guide?
"WHAT IT DOES TO WHAT"?

Seems you do not noticed that there are 2 variants:

- one for the vBios of the graphics card
- one for the Mac firmware

both are independent and don't affect the other variant.

toke lahti · Feb 15, 2024

Bmju said:
OpenCorePkg/Staging/EnableGop at master · acidanthera/OpenCorePkg

OpenCore bootloader. Contribute to acidanthera/OpenCorePkg development by creating an account on GitHub.

github.com

"The driver may be installed to vBIOS or to main firmware. It is expected that most Mac Pro users will use firmware insertion and most iMac users will chose vBIOS insertion, however both techniques work on both systems (but it is harder to modify the iMac firmware, since there is no simple way to enable writing to it)."

Why "it is expected that most Mac Pro users will use firmware insertion"?

If I do not need to mess MP's firmware, why would I want to do that?
If I can have the boot screen with just messing my GPU's firmware?

Confusing part (for me) is that when they both have "firmware" or "bootROM", just one of them is called firmware.
And it's also called EFI. Also in GPU card there is EFI. Or bios. Or both.
VBIOS is a good term. There's no confusion where it lies.

Bmju · Feb 15, 2024

toke lahti said:
Why "it is expected that most Mac Pro users will use firmware insertion"?

If I do not need to mess MP's firmware, why would I want to do that?
If I can have the boot screen with just messing my GPU's firmware?

Confusing part (for me) is that when they both have "firmware" or "bootROM", just one of them is called firmware.
And it's also called EFI. Also in GPU card there is EFI. Or bios. Or both.
VBIOS is a good term. There's no confusion where it lies.

They are both firmware, and both 'bios' (at least speaking loosely), and both EFI.

Why not mess with your MacPro's main firmware? Either way you are messing with the EFI drivers which the Mac loads, very early. In fact, you are inserting exactly the same driver, which gets loaded and then does exactly the same thing, from either place.

If you've already burnt your MacPro firmware, when upgrading from 4,1 to 5,1, or after boot rom cleaning service from @tsialex, then why not do the same again? You also get the advantage that very many different GPUs will all work for the native firmware UI (incl. native boot picker) from then on. But if you prefer to burn it to the GPU (and if it's not an AMD with too little space), then go ahead - it's your machine.

tsialex · Feb 15, 2024

Bmju said:
They are both firmware, and both 'bios' (at least speaking loosely), and both EFI.

vBIOS was very loosely used here, no? It's one of the ancient tech terms from the original IBM PC that continue to be used to this day but essentialy there is no real meaning since at least GPUs compatible with UEFI 2.x.

A better term to avoid any confusion could be GPU firmware, no?

tsialex · Feb 15, 2024

Further reading the readme, also the usage of "NVRAM chip" is not correct. There is no NVRAM chip as in SRAM or EEPROM/Flash for storing the NVRAM since probably 2007ish and only some of the very early Intel Macs ever had it, not all.

Seems you want to refer to the SPI flash memory that stores the BootROM.

Bmju · Feb 15, 2024

Bmju said:
They are both firmware, and both 'bios' (at least speaking loosely), and both EFI.

tsialex said:
vBIOS was very loosely used here, no? It's one of the ancient tech terms from the original IBM PC that continue to be used to this day but essentialy there is no real meaning since at least GPUs compatible with UEFI 2.x.

I didn't say they are both vBIOS! But both 'bios' in the (loose) sense where it's still used to mean firmware, even though (device or main) firmware is (U)EFI, not BIOS, now.

tsialex · Feb 15, 2024

Bmju said:
I didn't say they are both vBIOS! But both 'bios' in the (loose) sense where it's still used to mean firmware, even though (device or main) firmware is (U)EFI, not BIOS, now.

I should have add that I'm talking about the readme, when you refer to the GPU firmware as vBIOS.

Bmju · Feb 15, 2024

tsialex said:
vBIOS was very loosely used here, no? It's one of the ancient tech terms from the original IBM PC that continue to be used to this day but essentialy there is no real meaning since at least GPUs compatible with UEFI 2.x.

tsialex said:
Further reading the readme, also the usage of "NVRAM chip" is not correct. There is no NVRAM chip as in SRAM or EEPROM/Flash for storing the NVRAM since probably 2007ish and only some of the very early Intel Macs ever had it, not all.

Seems you want to refer to the SPI flash memory that stores the BootROM.

@tsialex - How about this:

https://github.com/mikebeaton/OpenCorePkg/tree/enablegop-greadme-updates/Staging/EnableGop

https://github.com/mikebeaton/OpenCorePkg/commit/32c33e96f41f0b15e89cd695b0a08a60eabd33e8

EDIT: Now at -

https://github.com/acidanthera/OpenCorePkg/tree/master/Staging/EnableGop

https://github.com/acidanthera/OpenCorePkg/commit/32c33e96f41f0b15e89cd695b0a08a60eabd33e8

tsialex · Feb 15, 2024

Bmju said:
@tsialex - How about this:

OpenCorePkg/Staging/EnableGop at enablegop-greadme-updates · mikebeaton/OpenCorePkg

OpenCore bootloader. Contribute to mikebeaton/OpenCorePkg development by creating an account on GitHub.

github.com

EnableGop: Update README.md wording · mikebeaton/OpenCorePkg@c3debf5

OpenCore bootloader. Contribute to mikebeaton/OpenCorePkg development by creating an account on GitHub.

github.com

Yep, seems good, easier to understand, with less ambiguities and a proper usage of terms.

If you don't mind, I'll make further suggestions down the road or send a PR.

Bmju · Feb 15, 2024

tsialex said:
If you don't mind, I'll make further suggestions down the road or send a PR.

PR might be good, sure.

Bmju · Feb 15, 2024

@tsialex - I just made a similar round of updates to the p.1 post of this thread.

roobarb! · Feb 16, 2024

Bmju said:
Happy New Year, Radeon VII users!

Thank you, @Bmju!

I've just caught up with the Radeon VII Pro BIOS solution to the choppy boot screens. Flashed the Radeon VII with the Pro BIOS using amdvbflash on Debian Linux and it worked perfectly straight away, even with the earlier EnableGopDirect v1.2 in my EFI ROM. ❤️

Went back to my original EFI backup, added EnableGop v1.4 using DXEinject, flashed it and this machine is just perfect now, much faster getting to the picker too. Really appreciate all the effort that's been put into straightening out the VII!

For reference, my card is also an XFX model like @h9826790's, no issues whatsoever under macOS, Linux or Windows. 👍

toke lahti · Feb 17, 2024

tsialex said:
Further reading the readme, also the usage of "NVRAM chip" is not correct. There is no NVRAM chip as in SRAM or EEPROM/Flash for storing the NVRAM since probably 2007ish and only some of the very early Intel Macs ever had it, not all.

Seems you want to refer to the SPI flash memory that stores the BootROM.

And BootROM is not read-only-memory! 🤯

iM 4,1-14,4 EnableGop: Pre-OpenCore GOP support for EFI-era iMacs and Mac Pros

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