Hello Gregor, On Sat, 2025-10-25 at 12:35 +0200, Gregor Riepl wrote: > > btw, the issue does not occur, if you open the floppy with another > > device major/minor like: fd0h1440 (mknod /dev/fd0h1440 b 2 28). > > I can confirm that this works and makes the drive spin. > Trying to dump a floppy result in lots of errors, but this may very well be a > problem with the drive or the floppy disk: > > [Oct25 12:23] block device autoloading is deprecated and will be removed. > [ +1.546997] I/O error, dev fd0_type7, sector 0 op 0x0:(READ) flags 0x84700 > phys_seg 1 prio class 2 > [ +0.399763] I/O error, dev fd0_type7, sector 16 op 0x0:(READ) flags 0x84700 > phys_seg 1 prio class 2 > [ +0.599822] I/O error, dev fd0_type7, sector 36 op 0x0:(READ) flags 0x84700 > phys_seg 1 prio class 2 > [ +0.399816] I/O error, dev fd0_type7, sector 48 op 0x0:(READ) flags 0x84700 > phys_seg 1 prio class 2 > [ +1.799332] I/O error, dev fd0_type7, sector 72 op 0x0:(READ) flags 0x84700 > phys_seg 1 prio class 2 > [ +0.091780] floppy0: sector not found: track 2, head 0, sector 9, size 2 > [ +0.000066] I/O error, dev fd0_type7, sector 80 op 0x0:(READ) flags 0x84700 > phys_seg 1 prio class 2 > [ +0.707901] I/O error, dev fd0_type7, sector 108 op 0x0:(READ) flags > 0x84700 phys_seg 1 prio class 2 > [ +0.248209] floppy0: sector not found: track 3, head 0, sector 5, size 2 > [ +0.000061] I/O error, dev fd0_type7, sector 112 op 0x0:(READ) flags > 0x84700 phys_seg 1 prio class 2 > [ +0.828954] floppy0: data CRC error: track 3, head 1, sector 7, size 2 > [ +0.199879] floppy0: data CRC error: track 3, head 1, sector 7, size 2
Please try to verify that your assumption is correct by trying a different floppy disk or drive or testing access to the floppy drive with an operating system known to work. We should no rely on assumptions. > > We fixed that in T2 Linux (debugged that for a longer time .. ), the reason > > was > > that the the probe __floppy_read_block_0 tries to read 1 page from disk, > > 8KB, > > which was more than the derived floppy size of 8 sectors (4KB) from the > > minor > > number, so the "beyond end of device" message comes up, see: > > https://github.com/rxrbln/t2sde/blob/main/package/kernel/linux/hotfix-floppy-not-4k-pages.patch > > Is this common for PC floppy drives? > Perhaps /dev/fd0 should register itself with the correct minor number instead. FWIW, I have opened an issue in the sparclinux issue tracker to document this bug [1]. Since the standard PC floppy driver in the kernel is actively maintained [2], it's worth sending the patch upstream for review. Adrian > [1] https://github.com/sparclinux/issues/issues/18 > [2] https://lkml.org/lkml/2019/7/31/771 -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer `. `' Physicist `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
