You guys are amazing, thank you!
The 00 00 00 80 part corresponds to the ECX register holding a binary value of 10...0 (31 zeroes). That single 1 is the VMM flag bit.
This makes a lot of sense now, thank you.
Next, the GPU DeviceProperty:
Code:
<key>PciRoot(0x0)/Pci(0x3,0x0)/Pci(0x0,0x0)</key>
<dict>
<key>agdpmod</key>
<data>cGlrZXJhAA==</data>
<key>rebuild-device-tree</key>
<data>AA==</data>
<key>shikigva</key>
<data>UA==</data>
</dict>
I'm looking at Whatevergreen documentation and:
-
agdpmod is set to pikera, default for external GPUs
OK
-
rebuild-device-tree is a new property not yet documented, I don't know what values to use, why 00?
-
shikigva has a
proposed chart but does not not match
@cdf choice, why 50?
Off-topic, related to Data manipulation:
One interesting detail, Hackintool does not support the character constant
\0. At least, I do not know how to paste it or enable it. If you know how to do it, please let me know. Otherwise, is safe to stick with the good old terminal.
In C programming:
The character constant '\0' represents the character with value zero, the null character. '\0' is often written instead of 0 to emphasize the character nature of some expression, but the numeric value is just 0.
@h9826790 if I enter ASCII pikera into Hackintool, I get a different Base64 value. If I use Apple's library plistlib, I need to pass the correct Data, otherwise I will get an invalid Base64 value.
These would be the correct values:
Code:
device_properties = {
'Add': {
'PciRoot(0x0)/Pci(0x3,0x0)/Pci(0x0,0x0)': {
'agdpmod': Data('pikera\0'),
'rebuild-device-tree': Data('00'),
'shikigva': Data('50')
}
},
'Block': {}
}
In other words, ASCII strings passed to Data should always end with a character constant '\0', while Hex values should be escaped with a '\x':
Code:
$ printf 'pikera\0' | base64
cGlrZXJhAA==
$ printf '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x00\x00\x00\x00' | base64
AAAAAAAAAAAAAACAAAAAAA==
If I paste the Base64 value, it will show ASCII pikera with a hidden character at the end (the character constant '\0'):
Code:
$ printf 'pikera\0' | base64
cGlrZXJhAA==
If I press delete once at end of ASCII pikera field,
cGlrZXJhAA== will turn
cGlrZXJh and Hex
70 69 6B 65 72 61 00 will turn
70 69 6B 65 72 61. It is missing a
00, which is the character constant '\0'.
Code:
$ printf 'pikera' | base64
cGlrZXJh
Now that I understand how to manipulate transformations, let's focus on the learning.
