Dear Paul,
I ran newest GRUB2 atop SeaBIOS. It contains MMIO serial patch.
I also provided etc/grub.cfg in the coreboot payload
Last readable serial output output is:
'
Run img/grub2
Calling addr 0x00009000
'
and after ~1s i get those bytes:
0x88 0x88 0x0C 0x0A 0x0A 0x00
I assume those bytes comes from GRUB
Kind regards,
Łukasz
W dniu 6.02.2023 o 14:54, Paul Menzel pisze:
Dear Łukasz,
Am 03.02.23 um 10:24 schrieb Łukasz Jeleń:
i've tried to turn on logging on serial console with:
serial --port=0xA0019000 --speed=115200 --word=8 --parity=no --stop=1
terminal_input --append serial
terminal_output --append serial
added to grub.cfg, but it does not work.
The thing I found: Quark soc has HSUART connected to MMIO32 at
0xA0019000, but GRUB expects serial to be at standard IO port e.g.:
0x03F8
Is there a way to make use MMIO32 serial with GRUB?
I just know of the patches posted to the mailing list [1], but never
dealt with that topic.
In SeaBIOS I can choose MMIO32 port at building stage with
CONFIG_DEBUG_SERIAL_MMIO and CONFIG_DEBUG_SERIAL_MEM_ADDRESS and it
works.
Where does it fail with SeaBIOS?
Kind regards,
Paul
[1]: https://lists.gnu.org/archive/html/grub-devel/2022-12/msg00261.html
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