On 21.06.2013 11:23, Michael Chang wrote: > Hi, > > The i386/pc/chainloader.c hangs when attempting to chainload other > disk's boot sector (or mbr) with a syntax like this. Say if current > environment setting root=hd0,msdos2. > > $ chainloader (hd1,msdos1)+1 > > However doing it this way always works. > > $ set root=hd1,msdos1 > $ chainloader +1 > > I suppose the first syntax is valid as it should override $root [1] > thus two cases should have identical result. But looking into the > chainloader source it seems that the $root is always used to obtain > the boot drive number and partition table. So there's a discrepancy if > root is not set to the chainloader device which is explicitly > specified in file. No, the behaviour you see is intended consider someone copying bootsector from (hd1,1) to (hd0,2)/boot.bin. It can still be booted with: root=hd1,1 chainloader (hd0,2)/boot.bin The disk passed in %dl and where the sector is loaded from isn't necessarily the same. > > The attached file fixes the problem for me, I'd like to contribute if > you think this is a problem or how to improve the patch. > > [1] http://www.gnu.org/software/grub/manual/grub.html#root > [2] http://www.gnu.org/software/grub/manual/grub.html#chainloader > > Thanks, > Michael > > > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel >
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