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> Hi all! Just came upon some info. on the TP 750C & Linux! I'll try this > out and let you all know about this asap! > > Later. beware that this may not by itself fix the problem. My floppy driver for linux had essentially the same changes described below. With those patches, linux could read/write the floppy drive, but it wouldn't recognize disk changes -- so when reading it would return cached data from the last diskette! Keith Moore > >In case anyone wants to know, here is how we just managed to get linux > >working with the floppy controller on the IBM ThinkPad 750C. The main > >difference is that when you read from port 3f7 and look at bit 7 to see > >whether the media has been changed, the controller reports 1 if not, and > >0 if so (at least when the motor is on: when the motor is off, the > >status of the bit never changes). This is exactly the reverse of the > > usual situation. > >To fix it, one must edit drivers/block/floppy.c so that the three > >occurences of > > > > inb(FD_DIR) & 0x80 > > > >are replaced by > > > > !(inb(FD_DIR) & 0x80) > > > >We don't know what kind of controller chip it uses, because IBM says that > >information is PROPRIETARY! But we managed to figure it out anyway with a > >great little msdos program called iospy which comes with the book "The > >Undocumented PC" by Frank van Gilluwe (publ Addison-Wesley, isbn > >0-201-62277-7). Iospy will display the contents of ports on the screen in > >an out of the way place while you use debug to step through the BIOS or > >whatever. Get it!