On Thu, Jan 21, 2016 at 11:48:27PM +0000, Steve McIntyre wrote: > > See > > http://www.syslinux.org/wiki/index.php/Doc/menu > > for docs on isolinux menus. Grub's support for isolinux menus is > clearly not complete/correct here, and that's your problem I'm > afraid. Isolinux parses these menus just fine.
I digged deeper, and I guess this is correct. There are three problems around here AFAICS: 1) Grub's implementation of invoking isolinux doesn't work correctly. 2) Grub's chainloading depends on BIOS/UEFI: http://www.gnu.org/software/grub/manual/grub.html | Chain-loading is only supported on PC BIOS and EFI platforms. > It looks like a (design?) bug that Libreboot won't do normal boot > sector booting like a conventional BIOS. 3) Libreboot doesn't provide the information for chainloading the same way as BIOS/UEFI. Most likely those issues have to be fixed in Grub. Maybe there is a workaround to mitigate the problem with an intermediate USB-stick by invoking SmartBootManager as payload (kernel), which doesn't depend on chainloading at all. There are hints that this was done a couple of years ago, but it looks difficult to reproduce this solution. Some tests indicate that there might be more issues with 16bit vs. 32bit mode. -- regards Frank
