diff options
| -rw-r--r-- | hw/block/fdc.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/hw/block/fdc.c b/hw/block/fdc.c index 818e8a4072..9ef899d91f 100644 --- a/hw/block/fdc.c +++ b/hw/block/fdc.c @@ -179,6 +179,21 @@ typedef struct FDrive { static FloppyDriveType get_fallback_drive_type(FDrive *drv); +/* Hack: FD_SEEK is expected to work on empty drives. However, QEMU + * currently goes through some pains to keep seeks within the bounds + * established by last_sect and max_track. Correcting this is difficult, + * as refactoring FDC code tends to expose nasty bugs in the Linux kernel. + * + * For now: allow empty drives to have large bounds so we can seek around, + * with the understanding that when a diskette is inserted, the bounds will + * properly tighten to match the geometry of that inserted medium. + */ +static void fd_empty_seek_hack(FDrive *drv) +{ + drv->last_sect = 0xFF; + drv->max_track = 0xFF; +} + static void fd_init(FDrive *drv) { /* Drive */ @@ -394,6 +409,7 @@ static void fd_revalidate(FDrive *drv) if (!blk_is_inserted(drv->blk)) { FLOPPY_DPRINTF("No disk in drive\n"); drv->disk = FLOPPY_DRIVE_TYPE_NONE; + fd_empty_seek_hack(drv); } else if (!drv->media_validated) { rc = pick_geometry(drv); if (rc) { |