[syslinux] Using memdisk with grub2 and a compressed iso

[Ady]

> Hello,
> 
> I'm having a problem booting a compressed ISO image using memdisk via grub2 (version 2.02).  The entry in my grub.cfg looks like:
> 
> menuentry 'boot ISO image' {
>     linux16 /memdisk iso
>     initrd16 /my-image.iso.gz
>   }
> 
> When selected, this starts to boot and then fails with:
> 
>    Ramdisk at 0x37979000, length 0x0033b298
>    gzip image: decompressed addr 0x7f7f7000, len 0x00008f58: failed
>    Decompression error: output buffer overrun
> 
> FWIW, my-image.iso.gz is 3388055 bytes long compressed, and 9394176 bytes long uncompressed.  The box in question has 8GiB of RAM.
> 
> 1) I have tried this with memdisk from syslinux 4.02, 4.05, and 6.03.  Same failure each time.
> 2) Changing the level of compression (i.e. gzip -1 instead of gzip -9) does not make it work.
> 3) Doing the same thing with grub1 (version 0.97), but using the same image and same version of memdisk, *does* work.
> 4) Uncompressing the ISO *does* make it work.
> 
> Any suggestions on where to look next?
> 
> David
> 
 
Your report suggests that the issue might be related to grub2. The 
problem could be related to some key word / syntax (e.g. some possible 
change between grub legacy and grub2), or it could be related to the 
source code itself (bug? dropped feature?), or some combination of 
them.

Regards,
Ady.
 
> 
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