ref: addcf037ca4dc1060318cfbd044f473ea594afe6
parent: a1ac58b98fe362b5e911ece04bceca4a0ed4a7af
author: cinap_lenrek <cinap_lenrek@gmx.de>
date: Mon Sep 23 17:12:41 EDT 2013
9bootfat: only check for fat at block 0 on floppy drives (thanks aap) smart boot manager has a "FAT" signature in its mbr causing 9bootfat to "detect" it as a fat filesystem and then fails to find plan9.ini. there shouldnt be a fat filesystem on harddrives at block 0, only on floppy drives. but some bioses use floppy drive numbers for usb harddrives so still check for a partition table. thanks aap for debugging this.
--- a/sys/src/boot/pc/fat.c
+++ b/sys/src/boot/pc/fat.c
@@ -339,7 +339,7 @@
return -1;
if(buf[0x1fe] != 0x55 || buf[0x1ff] != 0xAA)
return -1;
- if(lba == 0){+ if(lba == 0 && (drive & 0x80) == 0){ /* floppy */fat->drive = drive;
fat->partlba = 0;
if(!conffat(fat, buf))
--
⑨