On 08.07.2014 15:39, Raif S. Berent wrote: > Not to beat a dead horse, but I'd like to clarify a few issues that > seem to be not working. > You're confused as to what GRUB's responsibility is. > 1. I compiled and installed Grub_trunk on an old laptop, then copied > the debian.iso to a folder under (hd0,gpt*). Modified the grub.cfg and > tried to use "syslinux_configfile -i (loop)/isolinux/isolinux.cfg -r > (loop)" I got the exact same result as PXE booting (No CD-ROM). From > what I can tell, debian needs the loopback module from the iso loaded > and the iso to be loop-mounted as a second device in order to get this > working (have not asked the debian folk). Debian can't access GRUB's loopback. It has to find iso itself using special parameters. Use /boot/grub/loopback.cfg for those. Don't forget to set and export iso_path. > > 2. Most Debian-based iso's fail to properly boot with loopback over > PXE, including the likes of GParted and Inquisitor. They mostly fail > with kernel panic: can't mount root. > Ditto.
> 3. MEMDISK: There were several programs I can boot from my USB setup by
> including syslinux memdisk. These now fail due to memdisk error - for
> example (<...> means options I have tried): menuentry "HDT: hardware
> diagnostics tool" { set root="http,192.168.2.100" set
> memfile="/pub/tftp/rescue/rscd/memdisk" set
> isofile="/pub/tftp/rescue/rscd/hdt.img" linux16 ($root)$memfile
> <keeppxe floppy raw safeint> initrd16 ($root)$isofile }
> With PXE, memdisk may need to be replaced with gpxelinux.0, but that
> will require using Grub's broken pxechain. Is there a better way to do
> this? syslinux apparently can also use memdisk for iso booting KERNEL
> memdisk \ APPEND iso initrd=http://192.168.2.100/path/isofile.iso
>
memdisk isn't good idea for anything over few MiB or anything that uses
own drivers. Again Linux will not be able to access this memdisk.
> 4. I think it would be a great idea if known grub.cfg entries could be
> listed in the official Grub-wiki.
Nobody volunteered to host an "official wiki".
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