On 06/18/2010 03:44 PM, KESHAV P.R. wrote: > The problem seems to be related to the way grub2 allocates the memory > for the kernel and initramfs. Both my Archlinux x86_64 kernel and its > corresponding initramfs are LZMA compressed (which is now Archlinux > default). > > Can you try experimental branch? > I guess the problem is as follows :- > > 1. First load the LZMA compressed x86_64 kernel bzImage into memory. > 2. Then load the LZMA compressed initramfs cpio archive into memory. > 3. Launch the linux kernel. > 4. The kernel decompresses itself and then takes in all the boot > parameters passed by grub2 and the memory location of loaded initramfs > image (which is still LZMA compressed as in memory). > > The kernel might have overwritten parts of the initramfs LZMA archive > in the memory and once the kernel tries to create the rootfs it find a > corrupted initramfs in the memory. If I am right grub2 does not > decompress either the kernel or the initramfs. It is the job of the > kernel. > > This kernel panic or error somehow doee not occur with BIOS version of > GRUB2. It occurs in the x86_64 UEFI version only as of now (not sure > about i386 UEFI GRUB2). As I mentioned before Fedora's grub-legacy > grub.efi boots Archlinux without any problem. Archlinux does not > include any disk-controller driver or filesystem driver built-in the > kernel by default and it is impossible to boot without the initramfs > (atleast in GRUB2 UEFI x86_64 for now). > > Is this in anyway related to assumption of a compression ratio of 50% > for kernel/initramfs in the file > (grub2-source-dir)/loader/i386/efi/linux.c ? LZMA generally produces > even smaller compression ratios (between 20 to 30 %). I think adequate > contiguous memory should be allocated for uncompressed kernel alone so > that after its own decompression it finds a not-corrupted initramfs in > the memory. > > I am attaching the memory map reported by the UEFI firmware used (both > EDK and EDK2 of tianocore.sourceforge.net) if it is of help in any > case. Output using "memmap > fs0:\edk2_duet_memmap.txt" and "memmap > > fs0:\edk_duet_memmap.txt" in EFI shell. > > Regards > > > > _______________________________________________ > Bug-grub mailing list > Bug-grub@gnu.org > http://lists.gnu.org/mailman/listinfo/bug-grub >
-- Regards Vladimir 'φ-coder/phcoder' Serbinenko
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