diff options
| author | Kevin O'Connor <kevin@koconnor.net> | 2013-12-07 11:46:37 -0500 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2013-12-07 12:59:45 -0500 |
| commit | 302a6e82dc9e8c6f1028f98e578336aed07d8f66 (patch) | |
| tree | 5796887dcff9755d8dbce6bf4e685917e73e5fa1 | |
| parent | b94170cc4b6b08d03ac21e1c2390c94b7b881e7c (diff) | |
| download | seabios-302a6e82dc9e8c6f1028f98e578336aed07d8f66.zip seabios-302a6e82dc9e8c6f1028f98e578336aed07d8f66.tar.gz seabios-302a6e82dc9e8c6f1028f98e578336aed07d8f66.tar.bz2 | |
floppy: Fix incorrect LBA to CHS translation.
The floppy LBA to CHS translation was incorrect for the last sector of
a given cylinder. This wasn't a problem under QEMU as it came to the
same results anyway, but it causes errors of real floppy controllers.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
| -rw-r--r-- | src/hw/floppy.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/src/hw/floppy.c b/src/hw/floppy.c index d43b489..c5118ec 100644 --- a/src/hw/floppy.c +++ b/src/hw/floppy.c @@ -496,11 +496,10 @@ static struct chs_s lba2chs(struct disk_op_s *op) { struct chs_s res = { }; - u32 lba = op->lba; - u32 tmp = lba + 1; + u32 tmp = op->lba; u16 nls = GET_GLOBALFLAT(op->drive_gf->lchs.sector); - res.sector = tmp % nls; + res.sector = (tmp % nls) + 1; tmp /= nls; u16 nlh = GET_GLOBALFLAT(op->drive_gf->lchs.head); |