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== BIOS modding == I checked the VGA output and it seems fine when Linux uses it, but during boot it just doesn't use VGA out at all. It's seemingly likely that the BIOS is deciding not to output to VGA. I decided to try flashing a known good BIOS, and if that didn't help I'd tweak the settings using a BIOS editor. I installed FreeDOS 1.2 and used the following commands in AUTOEXEC.BAT to output over serial: MODE COM1: 9600,N,8,1,P CTTY COM1 This didn't work in FreeDOS 1.3 for some reason, perhaps its serial is broken. I downloaded the following tools: * [http://awdbedit.sourceforge.net/ awdbedit-1.0_bin.zip] *[http://www.lejabeach.com/CBROM.html CBROM32_198.EXE] (listed as CBROM 1.98) * [http://www.lejabeach.com/Modbin6.html modbin62.04.03.exe] * [http://ftp.emacinc.com/LegacyProducts/SBC/pcm-9375/Drivers/BIOS/ awd829.EXE] * [https://www.wimsbios.com/awardflasher.jsp awdflash899.exe] * [https://downloadt.advantech.com/download/downloadsr.aspx?File_Id=1-1E1MK Awdflash.exe] I downloaded the following BIOS versions: * [http://ftp.emacinc.com/LegacyProducts/SBC/pcm-9375/Drivers/BIOS/9375f113.zip 9375f113.zip] * [http://ftp.emacinc.com/LegacyProducts/SBC/pcm-9375/Drivers/BIOS/9375f114.zip 9375f114.zip] * [http://ftp.emacinc.com/LegacyProducts/SBC/pcm-9375/Drivers/BIOS/9375v115.zip 9375v115.zip] * [http://ftp.emacinc.com/LegacyProducts/SBC/pcm-9375/Drivers/BIOS/9375v117.zip 9375v117.zip] * [https://www.advantech.com/support/details/bios?id=1-22Y526 9375V115.BIN] * [https://www.advantech.com/support/details/bios?id=1-2DYMY1 9375V116.BIN] * [https://www.advantech.com/support/details/bios?id=1-2DYMZE 9375V117.BIN] * [https://www.advantech.com/support/details/bios?id=1-2DYN1X 9375V118.BIN] I also found [http://ftp.emacinc.com/LegacyProducts/SBC/pcm-9375/Drivers/BIOS/readme.txt a warning on CRT support with BIOS 1.17] and [https://www.advantech.com/support/details/faq?id=1+FY+68 how to make a CRT-only PCM-5862E BIOS]. Using modbin6 I was able to check the BIOS settings and found that it's already set to CRT and doesn't have the broken default 1.17 has, so I'm not even sure this method is going to work. Using awdbedit I was able to decompress and extract parts of the BIOS. I wasn't able to use any version of awdflash to flash any BIOS, at least I didn't think it worked. It requires VGA output to display its menus. I might try Uniflash or flashrom in the future. This is also risky in case I break the BIOS. The chip is a PM49FL004TJ chip and I don't have a flasher for it. I ordered 5 of those chips off eBay, my plan is to hot swap the chip and use that for BIOS foolery and keep the current one as a known good.
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