On Tue, Jul 27, 2010 at 03:13:59AM +0200, Peter Stuge wrote: > I'm working with the NXP LPC1343 ARM Cortex-M3 microcontroller. This > is a small one, it doesn't run Linux at all. It does however have a > full speed USB 2.0 peripheral built-in. > --8<-- me blindly trying a few sg commands > # sg_ident /dev/sdb > Report identifying information command, device not ready > # sg_get_config -v /dev/sdb > inquiry cdb: 12 00 00 00 24 00 > NXP LPC134X IFLASH 1.0 > Peripheral device type: disk > Get Configuration cdb: 46 00 00 00 00 00 00 20 00 00 > <hangs here for ~60 seconds, followed by usb 3-2: reset in dmesg> > get configuration: transport: Host_status=0x05 [DID_ABORT] > Driver_status=0x00 [DRIVER_OK, SUGGEST_OK] > > Get Configuration command failed > # It is pretty common for USB devices to not support the full suite of SCSI commands. In fact, the vast majority of USB storage devices support a very limited set of commands; they only support the commands they are likely to see from one of the "popular" OSes. > I don't quite understand why it needs to be limited to Windows only, > but it seems that Linux does *something* different enough that it > doesn't quite work for me. My guess is that if you tried the equivalent commands under Windows via a special utility, it would fail there too. This isn't really a Linux vs. Windows issue as much as it is a "device doesn't support all the commands" issue. > sdb mounts fine as vfat. In the mounted directory there's a single > 32kb firmware.bin file, which contains the current flash memory > contents. > Resetting again, into the USB ISP mode I can copy the firmware.bin > file, and it reads back *almost* the same as what I copied there, > except that it now has 1024 bytes of 0 prepended to it. > > Any ideas about why the device might get the impression that Linux > wants to write two empty sectors before the real data? It would seem very improbable that this was caused by a USB storage issue. I would check a few things: 1) Try fat instead of vfat 2) Are you mounting the whole device or a partition of the device? Partition detection of x86 partitioning can be problematic; I've seen devices which are not partitioned fool linux into thinking there is a partition on the device. Matt -- Matthew Dharm Home: mdharm-usb@xxxxxxxxxxxxxxxxxx Maintainer, Linux USB Mass Storage Driver Now payink attention, please. This is mouse. Click-click. Easy to use, da? Now you try... -- Pitr to Miranda User Friendly, 10/11/1998
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