[coreboot] T60 with ATI has black screen

[Richard Simpson]

Huzzah, it works!  My T60 with ATI graphics is now booting coreboot and
SeaBIOS and I have BUCTS set back to 0.

Thank you, Carl-Daniel, for your prompt assistance.  I can now proceed
to install my final operating system.

I bought a T60 because I read that it was one of the easiest coreboot
laptops.  I dread to think how I would have managed with a difficult one :-)

On 28/06/15 15:51, Richard Simpson wrote:
> Carl-Daniel,
> 
> I am back in the factory BIOS.  I have gathered the data for Łukasz and
> can upload it as soon as you send me a location.
> 
> For some reason I couldn't get the option ROM via the Linux kernel, but
> only from the mapped memory.  Basically, there didn't seem to be any rom
> file in the relevant /sys directory.  See below:
> 
> [rsimpson at newpercy Libreboot]$ lspci -tv
> -[0000:00]-+-00.0  Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and
> 945GT Express Memory Controller Hub
>            +-01.0-[01]----00.0  Advanced Micro Devices, Inc. [AMD/ATI]
> RV515/M54 [Mobility Radeon X1400]
>            +-1b.0  Intel Corporation NM10/ICH7 Family High Definition
> Audio Controller
>            +-1c.0-[02]----00.0  Intel Corporation 82573L Gigabit
> Ethernet Controller
>            +-1c.1-[03]----00.0  Intel Corporation PRO/Wireless 3945ABG
> [Golan] Network Connection
>            +-1c.2-[04-0b]--
>            +-1c.3-[0c-13]--
>            +-1d.0  Intel Corporation NM10/ICH7 Family USB UHCI Controller #1
>            +-1d.1  Intel Corporation NM10/ICH7 Family USB UHCI Controller #2
>            +-1d.2  Intel Corporation NM10/ICH7 Family USB UHCI Controller #3
>            +-1d.3  Intel Corporation NM10/ICH7 Family USB UHCI Controller #4
>            +-1d.7  Intel Corporation NM10/ICH7 Family USB2 EHCI Controller
>            +-1e.0-[15-18]----00.0  Texas Instruments PCI1510 PC card
> Cardbus Controller
>            +-1f.0  Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge
>            +-1f.1  Intel Corporation 82801G (ICH7 Family) IDE Controller
>            +-1f.2  Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA
> Controller [AHCI mode]
>            \-1f.3  Intel Corporation NM10/ICH7 Family SMBus Controller
> [rsimpson at newpercy Libreboot]$ ls /sys/devices/pci0000\:00/0000\:00\:01.0/
> 0000:00:01.0:pcie01   config                    driver
> local_cpus  pci_bus  resource          vendor
> 0000:00:01.0:pcie08   consistent_dma_mask_bits  enable         modalias
>    power    subsystem
> 0000:01:00.0          d3cold_allowed            firmware_node  msi_bus
>    remove   subsystem_device
> broken_parity_status  device                    irq            msi_irqs
>    rescan   subsystem_vendor
> class                 dma_mask_bits             local_cpulist  numa_node
>   reset    uevent
> [rsimpson at newpercy Libreboot]$
> 
> I'll try switching back to coreboot later today.
> 
> Cheers,
> 
> 	Richard
> 
> On 28/06/15 13:45, Carl-Daniel Hailfinger wrote:
>> Hi Richard,
>>
>> On 28.06.2015 12:58, Richard Simpson wrote:
>>> I have to say that knowing that you have the same T60 and that it is
>>> working is a big moral boost!
>>
>> Imagine how I felt when it happened to me. Fortunately that was at a
>> coreboot developer meeting and we had the tools to recover in case it
>> wouldn't have worked.
>>
>>
>>> Yes, the VGA port is working.
>>>
>>> Can you possibly expand on your instructions below?
>>>
>>> 1) You suggest that I patch the option ROM myself.  Where would I find
>>> instructions on how to do this?
>>
>> I had hoped that the option ROM patching was straightforward, e.g.
>> having LVDS data or somesuch in there. Comparing hexdumps of a
>> memory-extracted and a biosimage-extracted option ROM showed me that
>> while the differences are clearly visible, their meaning is not obvious
>> (it's not EDID). So this method is probably not going to fly.
>>
>>
>>> 2) If I decide that I need to extract it from a running system then I
>>> presume that I need to re-flash the factory BIOS.  Can I just do this
>>> with the same flashrom command that I used to flash coreboot?
>>
>> You can do this with the same flashrom command you used to flash the
>> image a second time. Please don't use bucts for flashing back from
>> coreboot to factory BIOS, you only need it in the BIOS->coreboot direction.
>> That said, I think Vladimir Serbinenko (phcoder) had a trick on how to
>> modify the original BIOS so that bucts wouldn't be needed any more in
>> either direction.
>>
>> Łukasz Dmitrowski is one of our GSoC students and part of his project is
>> to try to make such stuff easier in the future. He needs data for that,
>> though.
>> Richard, could you please collect the following data (as root) from the
>> system while it's running the factory BIOS?
>> lspci -nnvvvxxxx
>> dmidecode
>> video BIOS via both extraction methods (please make sure that we can
>> find out which is which)
>> superiotool -deV
>> dmesg
>> /var/log/Xorg.0.log (name may be a bit different, I want a log file from
>> Xorg running on the machine while the factory BIOS is active)
>> flashrom dump of the factory BIOS
>>
>> Please don't send that data to the mailing list, I'll provide some space
>> for you to upload it.
>>
>>
>>> 3) On this page (http://www.coreboot.org/VGA_support) two ways of
>>> getting the video BIOS from a running system are listed ('Retrieval via
>>> Linux kernel' and 'Extraction from mapped memory').  Does it matter
>>> which one I try?
>>
>> AFAICS the images you get should be identical. Better check them to make
>> sure.
>>
>>
>>> 4) Can you be a lot more specific about what I should do about the checksum?
>>
>> Either let SeaBIOS ignore the checksum:
>> # cbfstool build/coreboot.rom add-int -i 0 -n etc/optionroms-checksum
>> Or you correct the checksum of the option ROM itself. IIRC there is some
>> tool to do that, but I coudln't find it in my bash history.
>>
>>
>>> Apologies if all these instructions are in the Wiki and I have been too
>>> dumb to find them.
>>
>> Not sure if all of this is in the wiki. If you think anything is
>> missing, please tell me so I can add it.
>>
>> Regards,
>> Carl-Daniel
>>
>>
>>> On 27/06/15 23:19, Carl-Daniel Hailfinger wrote:
>>>> On 27.06.2015 23:39, Richard Simpson wrote:
>>>>> I have finally successfully flashed the BIOS on my T60 with coreboot.
>>>>> Sadly, my ATI controlled screen remains completely black.  Fortunately I
>>>>> can still get in via ssh.  Here is what I can deduce so far.+
>>>> AFAICS you have exactly the same T60 as I have.
>>>>
>>>>
>>>>> lspci says:
>>>>> 01:00.0 0300: 1002:7145 (prog-if 00 [VGA controller])
>>>>> [...]
>>>>> The vgabios which I extracted from the factory bios
>>>> Ah yes. Bad idea. AFAIK the factory BIOS patches the VGA optionrom at
>>>> runtime with the correct values for the LVDS panel. This means you
>>>> either have to patch the VGA optionrom yourself or you have to extract
>>>> the VGA optionrom from the memory of the running system. If you extract
>>>> it from memory, please note that the runtime patching causes the
>>>> checksum to be incorrect, and you either have to fix the checksum or
>>>> tell SeaBIOS to ignore the checksum.
>>>>
>>
>>
> 
>