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[REQUEST] Asus eeepc 1025C
Thank you Xenon, for your excellent work. I'm installing Linux Mint 20.1 x64. My 1025C gets a second chance!
(04-14-2014, 06:24 AM)xenon Wrote: I got it! The culprit is the code that does this in BIOS: [MSR 0x122] |= 3;
So, just blank (NOP) out that piece of code in BIOS and have fun with x64. I don't have any experience with BIOS modding, but I am familiar with assembly language programming and almost everything in Intel SDM.
It took me quite some time to figure out there are 2 places to patch (for bootstrap processor and application processors).
Below are some notes to help you gain confidence that nothing fishy is being added. Use your hex editor compare function to compare between the BIOS file from Asus and my patched version.

Original (starting point):
2097152 bytes
SHA-256: 73bae3b7e061e4d6054e70b0405150ed93258d39b5561bdfb902554edd3e0a4f

//32-bit mode
53        push  ebx
6aff      push  0xffffffff
53        push  ebx
6a03      push  0x3
6822010000 push  0x122
e85c240000 call  func //NOP out this instruction
83c414    add    esp,0x14

//32-bit mode
b922010000 mov    ecx,0x122
0f32      rdmsr
0c03      or    al,0x3
0f30      wrmsr //NOP out this instruction

After NOP out the 2 locations with 0x90 (7 bytes in total),
SHA-256: af673c221dd145ea9faa495b5fac21d945541396a72cec3943ec1581e4a7167b

With that, you can enjoy your x64 system.
Optionally, you can update the microcode as well. I discovered Acer AOD270 BIOS has a newer version of the microcode.
In Asus 1025C (and old BIOS version of Acer AOD270): Version 0x010C, 2011-11-23
In Acer AOD270: Version 0x010D, 2011-12-22

With new microcode,
SHA-256: f568ec0f4ec31cc0a12b469a5092a233285bcfb018c6bdbd05a3ba5b765ad347

Note the hashes are on 2097152-byte ROM file, not zip file.

Immense thanks for the custom BIOS! I can confirm it worked for an old Asus Eee PC 1025C.

The only issue I had is that the ethernet does not work at all, but I didn't try it before flashing the BIOS, so it may already have been the case.

The processor is antiquated, so it's pretty hard to get a system that won't make it run at 100% all the time. I went with Linux Mint XFCE 20.2, and it works very well, while still being user-friendly.

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