Re: [coreboot] Question on VGA BIOS extraction
* Iru Cai mytbk920...@gmail.com [150330 18:24]: Hi, I'm trying to build Coreboot for ThinkPad X220. I first backup the vendor BIOS, then use UEFITool to extract a VBIOS. The romheader program detects the ROM's PCI data structure and reports the device id is 8086:0106, but the VGA controller's device id is 8086:0126. I extracted the video ROM from a running X220 memory and use romheader to test it, the result is still 8086:0106. How could this happen? The same VGA OPROM binary is used for a whole set of different chipsets. However, the PCI header specification does not have a way to express that. The main system firmware has to know that, for a 0x0126 device it has to look for the 0x0106 OPROM. Hence coreboot has a mapping function for most newer (Intel) chipsets. Stefan -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot
[coreboot] Question on VGA BIOS extraction
Hi, I'm trying to build Coreboot for ThinkPad X220. I first backup the vendor BIOS, then use UEFITool to extract a VBIOS. The romheader program detects the ROM's PCI data structure and reports the device id is 8086:0106, but the VGA controller's device id is 8086:0126. I extracted the video ROM from a running X220 memory and use romheader to test it, the result is still 8086:0106. How could this happen? Iru -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot
Re: [coreboot] Question on VGA BIOS extraction
On 03/30/2015 11:24 AM, Iru Cai wrote: Hi, I'm trying to build Coreboot for ThinkPad X220. I first backup the vendor BIOS, then use UEFITool to extract a VBIOS. The romheader program detects the ROM's PCI data structure and reports the device id is 8086:0106, but the VGA controller's device id is 8086:0126. I extracted the video ROM from a running X220 memory and use romheader to test it, the result is still 8086:0106. How could this happen? Iru Some PCI devices can change their device ID based on a configuration register or two (I know the XGI Volari can do this for instance). It is possible that the proprietary BIOS changes the ID for some reason. -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 http://www.raptorengineeringinc.com -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot
Re: [coreboot] Question on VGA BIOS extraction
Likewise on thinkpad tablets the name of the digitizer (WACF004) can be changed by the ACPI DSDT depending on things detected by the BIOS or not. You may want to check the DSDT On Mon, Mar 30, 2015 at 12:29 PM, Timothy Pearson tpear...@raptorengineeringinc.com wrote: On 03/30/2015 11:24 AM, Iru Cai wrote: Hi, I'm trying to build Coreboot for ThinkPad X220. I first backup the vendor BIOS, then use UEFITool to extract a VBIOS. The romheader program detects the ROM's PCI data structure and reports the device id is 8086:0106, but the VGA controller's device id is 8086:0126. I extracted the video ROM from a running X220 memory and use romheader to test it, the result is still 8086:0106. How could this happen? Iru Some PCI devices can change their device ID based on a configuration register or two (I know the XGI Volari can do this for instance). It is possible that the proprietary BIOS changes the ID for some reason. -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 http://www.raptorengineeringinc.com -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot
Re: [coreboot] Question on VGA BIOS extraction
TP X220 suppose to have a UEFI compatible BIOS, is it possible it has a UEFI DXE VGA driver (not sure what's the proper name of it) except a legacy video? Maybe you should boot up system with original BIOS and check the content in 0xC000 segment, is it a legacy VBIOS or it's empty... On Mon, Mar 30, 2015 at 7:10 PM, Charles Devereaux coreb...@guylhem.net wrote: Likewise on thinkpad tablets the name of the digitizer (WACF004) can be changed by the ACPI DSDT depending on things detected by the BIOS or not. You may want to check the DSDT On Mon, Mar 30, 2015 at 12:29 PM, Timothy Pearson tpear...@raptorengineeringinc.com wrote: On 03/30/2015 11:24 AM, Iru Cai wrote: Hi, I'm trying to build Coreboot for ThinkPad X220. I first backup the vendor BIOS, then use UEFITool to extract a VBIOS. The romheader program detects the ROM's PCI data structure and reports the device id is 8086:0106, but the VGA controller's device id is 8086:0126. I extracted the video ROM from a running X220 memory and use romheader to test it, the result is still 8086:0106. How could this happen? Iru Some PCI devices can change their device ID based on a configuration register or two (I know the XGI Volari can do this for instance). It is possible that the proprietary BIOS changes the ID for some reason. -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 http://www.raptorengineeringinc.com -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot
