On Fri, 7 Jul 2023 00:39:46 +0300 ValdikSS via Grub-devel <grub-devel@gnu.org> wrote:
> GRUB2 limits number of sectors read at once in LBA mode to the > number reported in CHS disk geometry by BIOS. > This is unnecessary, as IBM/MS INT13 Extensions allows reading > up to 127 sectors in a single call. Please provide more documentation for this. Wikipedia[1] suggests that IBM/MS INT13 Extensions allows reading up to 64K sectors in a single call. But that "some Phoenix BIOSes are limited to a maximum of 127 sectors". So the above seems misleading. > > This fixes greatly increased boot times on WYSE C10LE x86 thin > client with Phoenix bios. > > See: https://lists.gnu.org/archive/html/grub-devel/2023-07/msg00001.html First, this seems risky to me to be added for the release. Why do we believe that some other bios doesn't have a limit less than 127? Also, based on reading the email in the link above, am I correct in concluding that your bios set the CHS values returned in grub_biosdisk_rw_int13_extensions() from the values in the MBR? Glenn [1] https://en.wikipedia.org/wiki/INT_13H#INT_13h_AH=42h:_Extended_Read_Sectors_From_Drive _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
