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Bug #590
openWith GRUB payload cbmem in GNU/Linux fails with `Table not found.`
Start date:
04/10/2025
Due date:
% Done:
0%
Estimated time:
Affected versions:
Needs backport to:
Affected hardware:
Affected OS:
Description
See emulation/qemu-i440fx/25.03-154-g9e757b3396/2025-04-10T04_35_41Z in the board status repository for the configuration.
Building coreboot (25.03-154-g9e757b3396) for emulation/qemu-i440fx with GRUB (master) as payload, cbmem does not find the CBMEM tables and aborts with Table not found..
qemu-system-x86_64 -bios /dev/shm/coreboot/build/coreboot.rom -L /dev/shm -enable-kvm -smp cpus=2 -m 1G -hda /dev/shm/debian-32.img -serial stdio -net nic -net user,hostfwd=tcp::22222-:22
Using SeaBIOS, it works.
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In the GRUB command line, running GRUB’s cbmemc, it outputs the CBMEM console content. So, it seems to be overwritten later somehow.
Updated by Paul Menzel 1 day ago
I faintly remember something about E820 tables. Found it, for FILO, commit 389be2bdf8ee (x86/linux_load: Map E820 types) addressed this.
Updated by Paul Menzel 1 day ago
- File 0001-kern-coreboot-mmap-Map-to-reserved.patch 0001-kern-coreboot-mmap-Map-to-reserved.patch added
- Subject changed from emulation/qemu-i440fx with GRUB payload: cbmem fails with `Table not found.` to With GRUB payload cbmem in GNU/Linux fails with `Table not found.`
Indeed, adding iomem=relaxed to the Linux kernel command line, cbmem -c works. Untested(?) GRUB patch attached.
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