On 02/19/19 09:49, Gerd Hoffmann wrote: > Hi, > >> (2) If I change the cmdline to "lun=5", then the exchange is: > > Not supported (by the usb protocol). > > The protocol has a control message to query the number of devices (grep > for GetMaxLun in qemu). LUNs are not allowed to be sparse. So, with a > single storage device the LUN must be zero. With two devices the LUNs > must be 0,1, with three 0,1,2 etc., you get the idea :)
Yes, Phil explained the same -- I originally missed this part of the documentation (because the requirement is documented, so the fault is clearly mine). However, once I fixed the configuration (so that I'd have LUNs 0 and 1), edk2 still tripped an assert. Please see my message elsewhere in this thread; the fixed config case is marked as item (4). Thanks! Laszlo > Maybe usb-bot should check for that and throw an error, I think right > now we only have the generic scsi code check which will verify the lun > isn't too big (<= 15) but will not check the non-sparse requirement. > > cheers, > Gerd >
