Hi,
I have this wifi device with on-board storage for the Windows driver:
New USB device found, idVendor=148f, idProduct=2878, bcdDevice= 0.01
After switching to wifi mode, we can see it's a MT7601U:
New USB device found, idVendor=148f, idProduct=7601, bcdDevice= 0.00
The problem with this one is that it can't be mounted, nothing happens
for a long time. I'm testing with kernel 6.12.8-arch1-1 but it's been
like this for at least two years.
The problem seems to be that reading from the "end" of the device
takes 17 seconds. I assume the reason for that is the fake capacity:
SCSI Payload (Read Capacity(10) Response Data)
[LUN: 0x0000]
[Command Set:CD-ROM (0x05) ]
[MMC Opcode: Read Capacity(10) (0x25)]
[Request in: 212]
[Response in: 217]
LBA: 65280
Block size in bytes: 2048
Read capacity: 133693440 bytes (127.50 MiB)
The real capacity is probably just 8 MiB. The driver files stored in
it are ~7 MiB total.
This takes 17 seconds and returns 4096 bytes filled with 0xff:
SCSI CDB Read(10)
[LUN: 0x0000]
[Command Set:CD-ROM (0x05) ]
[Response in: 565]
Opcode: Read(10) (0x28)
Flags: 0x00
Logical Block Address (LBA): 0x0000fefc (65276)
...0 0000 = Group: 0x00
Transfer Length: 2
Control: 0x00
Windows never tries to read that far. (The device works in Windows.)
How can this be fixed?
usb_modeswitch can switch it to wifi mode, so it's not a huge problem.
I'm just curious.Attachment:
mt7601u-linux.pcapng
Description: application/pcapng
Attachment:
mt7601u-windows.pcapng
Description: application/pcapng
