[SeaBIOS] Problems with Linux payload
Curt Brune
curt at cumulusnetworks.com
Sat Aug 16 00:38:30 CEST 2014
Hello -
First time poster, so take it easy on me :)
This is a great project -- I was able to get a kvm+coreboot+SeaBIOS
environment going pretty easily. I started with the master branch of
coreboot and went from there.
I am having a problem trying to load a Linux kernel+initramfs payload
from SeaBIOS.
I can successfully boot the same kernel+initramfs straight from
coreboot (without SeaBIOS) as a payload. Also I can boot the same
kernel+initramfs from the hard disk using SeaBIOS when GRUB is
installed on the hard disk. So I'm pretty sure my kernel+initramfs is
OK.
My rom looks like this:
coreboot.rom: 16384 kB, bootblocksize 1416, romsize 16777216, offset 0x0
alignment: 64 bytes
Name Offset Type Size
cmos_layout.bin 0x0 cmos_layout 1160
fallback/romstage 0x4c0 stage 19569
fallback/ramstage 0x5180 stage 55849
config 0x12c00 raw 3132
fallback/payload 0x13880 payload 57928
vgaroms/sgabios.bin 0x21b00 raw 4096
etc/boot-menu-wait 0x22b40 raw 8
etc/boot-menu-key 0x22b80 raw 8
etc/boot-menu-message 0x22bc0 raw 34
etc/screen-and-debug 0x22c40 raw 8
img/LINUX 0x22c80 payload 8474826
(empty) 0x837d80 null 8158360
When I break into SeaBIOS during the boot I get this menu:
Select boot device:
1. DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
2. Virtio disk PCI:0:4
3. Legacy option rom
4. iPXE (PCI 00:03.0)
5. Payload [LINUX]
When I select "5" I get this:
Searching bootorder for: HALT
drive 0x000f4d50: PCHS=16383/16/63 translation=lba LCHS=1024/255/63 s=33554432
Running option rom at cc80:0003
Booting from CBFS...
Run img/LINUX
Calling addr 0x00040000
...
[System Reboots]
I turned on some debug in coreboot and SeaBIOS and compared the
successful boot (coreboot+Linux) to the unsuccessful boot
(coreboot+SeaBIOS+Linux). I compared the segment offsets and sizes
between the two cases and they were the same. Also the 0x00040000
entry point was the same.
I am mostly stuck now. Is this even a supported boot option? I'm new
to SeaBIOS, so any help is much appreciated.
Thanks again for a great project -- I had pretty smooth sailing up to
this point.
Cheers,
Curt
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