p8h61-m pro gfx no init sandybridge

[Simon Newton]

Hi folks,

For some reason, gfx wont init on Sandybridge P8H61-M PRO with i5-2500T 
on coreboot 4.9

Following a recommendation from Icon in coreboot IRC chat, the following 
debug was added to check the value of reg16

diff ../core2/src/northbridge/intel/sandybridge/early_init.c 
./src/northbridge/intel/sandybridge/early_init.c
86c86
<
---
>

102a103
> printk(BIOS_DEBUG, "%lx\n", (long)reg16);

The serial log shows

coreboot-4.9-1050-gebd8a4f90c-dirty Sat Mar 16 16:22:16 UTC 2019 
romstage starting (log level: 7)...
Setting up static southbridge registers... done.
Disabling Watchdog reboot... done.
Setting up static northbridge registers... done.
ffff
Graphics not supported by this CPU/chipset.
Back from sandybridge_early_initialization()

lspci with manufacturers BIOS and linux shows the display controller at 
00:02.0 as 8086:0102 . There are no other display controllers connected 
to the system.

Build log, defconfig, flash log and boot log are attached

Any pointers are greatly appreciated!

[Simon Newton]

Thanks Hellsenberg in IRC chat. This resolves the issue and VGA lights now

$ diff ../core2/src/mainboard/asus/p8h61-m_pro/Kconfig 
src/mainboard/asus/p8h61-m_pro/Kconfig
24c24
<     select NORTHBRIDGE_INTEL_IVYBRIDGE
---
> select NORTHBRIDGE_INTEL_SANDYBRIDGE

$ make olddefconfig && make

On 17/03/2019 17:35, Simon Newton wrote:
> Hi folks,
>
> For some reason, gfx wont init on Sandybridge P8H61-M PRO with 
> i5-2500T on coreboot 4.9
>
> Following a recommendation from Icon in coreboot IRC chat, the 
> following debug was added to check the value of reg16
>
> diff ../core2/src/northbridge/intel/sandybridge/early_init.c 
> ./src/northbridge/intel/sandybridge/early_init.c
> 86c86
> <
> >
>
> 102a103
> > printk(BIOS_DEBUG, "%lx\n", (long)reg16);
>
> The serial log shows
>
> coreboot-4.9-1050-gebd8a4f90c-dirty Sat Mar 16 16:22:16 UTC 2019 
> romstage starting (log level: 7)...
> Setting up static southbridge registers... done.
> Disabling Watchdog reboot... done.
> Setting up static northbridge registers... done.
> ffff
> Graphics not supported by this CPU/chipset.
> Back from sandybridge_early_initialization()
>
> lspci with manufacturers BIOS and linux shows the display controller 
> at 00:02.0 as 8086:0102 . There are no other display controllers 
> connected to the system.
>
> Build log, defconfig, flash log and boot log are attached
>
> Any pointers are greatly appreciated!

[Angel Pons]

Hello,

This is Hellsenberg from IRC.

On Sun, Mar 17, 2019, 18:53 Simon Newton <[e-mail] wrote:
> Thanks Hellsenberg in IRC chat. This resolves the issue and VGA lights now
>
> $ diff ../core2/src/mainboard/asus/p8h61-m_pro/Kconfig
> src/mainboard/asus/p8h61-m_pro/Kconfig
> 24c24
> <     select NORTHBRIDGE_INTEL_IVYBRIDGE
> > select NORTHBRIDGE_INTEL_SANDYBRIDGE
>
> $ make olddefconfig && make

This change is needed because the northbridge setting (the "northbridge" is
part of the CPU on SNB/IVB) must match the installed CPU for libgfxinit to
work properly. This can be changed on any SNB/IVB board as well.

I hope the libgfxinit patches that fix this issue get merged soon, but for
now this workaround will have to do.

Best regards,

Angel Pons
>