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sdauth
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Joined: 19 Sep 2018
Posts: 569
Location: Ásgarðr
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 Posted: Fri Jan 05, 2024 8:38 pm Post subject: [SOLVED]qemu - use seabios runtime config with -fw_cfg |
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Hello,
I'd like to use this seabios runtime config option (https://www.seabios.org/Runtime_config) :
with value "1"
Controls option ROM execution for roms found on PCI devices (as opposed to roms found in CBFS/fw_cfg). Valid values are 0: Execute no ROMs, 1: Execute only VGA ROMs, 2: Execute all ROMs. The default is 2 (execute all ROMs).
The seabios page says :
When SeaBIOS runs natively on QEMU the files are passed from QEMU via the fw_cfg interface.
What's the correct syntax ?
I found this example (using ovmf) :
| Code: | | -fw_cfg name=opt/ovmf/X-PciMmio64Mb,string=65536 |
But I can't make it work with seabios, I tried
| Code: | | -fw_cfg name=opt/seabios/etc/pci-optionrom-exec,string=1 |
but the optionrom on my PCI card (a 4 SATA ports "RAID" card with SIL3114 chipset) is still loading when seabios starts on my vm. (vfio-pci)
edit:
As a workaround, I compiled my own seabios (loaded with -bios switch) with :
| Code: | | # CONFIG_OPTIONROMS is not set |
in Makefile
The VM boots fine, although obviously with no video output until Windows starts.
Thanks.
Last edited by sdauth on Sat Jan 06, 2024 1:53 pm; edited 1 time in total |
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sdauth
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Joined: 19 Sep 2018
Posts: 569
Location: Ásgarðr
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| Posted: Fri Jan 05, 2024 11:24 pm Post subject: |
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I tried on my laptop, can't try now on my desktop. (busy with updates)
seabios debug output (using -fw_cfg name=etc/pci-optionrom-exec,string=1)
| Code: | | qemu-system-x86_64 -M q35 -m 1G -nic none -boot menu=on -bios seabios/out/bios.bin -chardev pipe,path=seabios.log,id=seabios -device isa-debugcon,iobase=0x402,chardev=seabios -fw_cfg name=etc/pci-optionrom-exec,string=1 |
| Code: | SeaBIOS (version rel-1.16.3-0-ga6ed6b70)
BUILD: gcc: (Gentoo Hardened 12.3.1_p20230825 p2) 12.3.1 20230825 binutils: (Gentoo 2.41 p2) 2.41.0
No Xen hypervisor found.
enabling shadow ram
Running on QEMU (q35)
physbits: signature="AuthenticAMD", pae=yes, lm=yes, phys-bits=40, valid=yes
cpuid 0x40000000: eax 40000001, signature 'TCGTCGTCGTCG'
Found QEMU fw_cfg
QEMU fw_cfg DMA interface supported
qemu/e820: addr 0x000000fd00000000 len 0x0000000300000000 [reserved]
qemu/e820: addr 0x0000000000000000 len 0x0000000040000000 [RAM]
qemu/e820: RamSize: 0x40000000
qemu/e820: RamSizeOver4G: 0x0000000000000000
malloc preinit
Relocating init from 0x000d0280 to 0x3efea120 (size 89664)
malloc init
Add romfile: etc/show-boot-menu (size=2)
Add romfile: etc/irq0-override (size=1)
Add romfile: etc/max-cpus (size=2)
Add romfile: etc/numa-cpu-map (size=8)
Add romfile: etc/numa-nodes (size=0)
Add romfile: bios-geometry (size=0)
Add romfile: bootorder (size=0)
Add romfile: etc/acpi/rsdp (size=20)
Add romfile: etc/acpi/tables (size=131072)
Add romfile: etc/boot-fail-wait (size=4)
Add romfile: etc/e820 (size=40)
Add romfile: etc/pci-optionrom-exec (size=1)
Add romfile: etc/smbios/smbios-anchor (size=31)
Add romfile: etc/smbios/smbios-tables (size=309)
Add romfile: etc/smi/features-ok (size=1)
Add romfile: etc/smi/requested-features (size=8)
Add romfile: etc/smi/supported-features (size=8)
Add romfile: etc/system-states (size=6)
Add romfile: etc/table-loader (size=4096)
Add romfile: etc/tpm/log (size=0)
Add romfile: genroms/kvmvapic.bin (size=9216)
Moving pm_base to 0x600
init ivt
init bda
init bios32
init PMM
init PNPBIOS table
init keyboard
init mouse
init pic
math cp init
pci setup
[...]
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With a little warning :
| Code: | | qemu-system-x86_64: -fw_cfg name=etc/pci-optionrom-exec,string=1: warning: externally provided fw_cfg item names should be prefixed with "opt/" |
It seems to be correctly registered as you can see:
| Code: | | Add romfile: etc/pci-optionrom-exec (size=1) |
I will update this post later. |
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sdauth
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Joined: 19 Sep 2018
Posts: 569
Location: Ásgarðr
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| Posted: Sat Jan 06, 2024 3:22 am Post subject: |
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Success!
I used :
| Code: | | -fw_cfg name=etc/pci-optionrom-exec,file=pci-optionrom-exec |
As you can see, the "string" option is gone and was not correct, seabios still loaded the optionrom with a warning in the log:
| Code: | | WARNING! Found unaligned PCI rom (vd=1095:3114) |
So to make it work, you need to replace it with the "file" option
Use encoderint.py (in seabios/scripts) to create the file with the value desired.
Example:
| Code: | | python3 encodeint.py pci-optionrom-exec 1 |
The VM starts fine, the "raid" configuration menu doesn't show up anymore in seabios.
The drive attached to the card works just fine as well without the optionrom.  |
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