On Mon, Jun 13, 2016 at 02:15:15PM +0200, Jiri Kosina wrote: > > up to vanilla kernel 4.4.13 floppy functionality performs like it should. > > (On an x86 PC that is. With a 1.44MB diskette drive.) > > >From kernel 4.5* and up it changed to barely usable. > > > > After a virgin start (cold or warm boot) with an empty diskette drive and > > then loaded with a standard 720K diskette you may run 'mdir' (from mtools) > > and it shows the directory fine. > > The first time you load a standard 1.44MB diskette (wether it is a virgin > > start or after a 720K disktette) and you run mdir, it says literally: > > > > plain_io: Input/output error > > init A: could not read boot sector > > Cannot initialize 'A:' > > > > After this, all subsequent runs of mdir will do fine on both floppies. > > However, most of my floppies are in a different format. (1.6MB) > > I rely on 'setfdprm' (from fdutils) to set the correct parameters. > > > > setfdprm /dev/fd0 1600/1440 > > /dev/fd0: Invalid argument > > > > Strace shows me: > > ... > > open(/dev/fd0, O_ACCMODE) = -1 > > > > So this actually means that 'invalid argument' refers to O_ACCMODE. > > Hmm, could you please test with 09954bad448 reverted? (although I don't > really have a good explanation currently how it'd be causing what you are > observing). > > Thanks, > > -- > Jiri Kosina
Hmm. Now I need a crash course git. After reading at www.kernel.org/pub/software/scm/git/docs/user-manual.html I now tried: git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git checkout -b new v4.5 (assuming that the first 'wrong' kernel would be best) git revert 09954bad448 (that did something, which I assume te be good) copied the .config file from 4.5 I had lying around and ran make. Surprising or not, the thusly compiled kernel ran fine and I could handle floppies like before! (open(/dev/fd0,O_ACCMODE) succeeds.) Regards, Wim. ----- [email protected] -----
