Hallo!
I am using Linux kernel 2.6.8.1 and 2.6.9-rc2. Results are the same with both kernels.
I got a couple of USB 2.0 cards besed on ALi's M5273 chip. With the ohci-hcd module (as USB 1.1) they work very well, no probs.
But with the ehci-hcd module (as USB 2.0) they give me a lot of trouble:
To get mass storage devices working at all, I need to change the file
scsiglue.c from the usb-storage module.
I changed the .max_sectors entry from 240 to 128.
For Genesys devices (the one with Genesys GL811E chip) it is much worse,
I need to change from 128 sectors to 64 (like it's already done in kernel 2.6.9-rc2).
But even with this changes, it is only possible to operate one device at a time.
When I transfer data from my 1st USB hard disk, and then while working,
switch my 2nd USB disk on, it screw up my 1st.
And also when both USB disks are already on, I can not use both at the same
time.
I get tons of this in my /var/log/syslog:
Sep 16 10:32:23 ws-06 kernel: SCSI error : <4 0 0 0> return code = 0x70000
Sep 16 10:32:23 ws-06 kernel: end_request: I/O error, dev sda, sector 528832
Sep 16 10:32:23 ws-06 kernel: Buffer I/O error on device sda, logical block 66104
Sep 16 10:32:23 ws-06 kernel: SCSI error : <4 0 0 0> return code = 0x70000
Sep 16 10:32:23 ws-06 kernel: end_request: I/O error, dev sda, sector 528840
Sep 16 10:32:23 ws-06 kernel: Buffer I/O error on device sda, logical block 66105
Sep 16 10:32:23 ws-06 kernel: SCSI error : <4 0 0 0> return code = 0x70000
Sep 16 10:32:23 ws-06 kernel: end_request: I/O error, dev sda, sector 528400
Sep 16 10:32:23 ws-06 kernel: Buffer I/O error on device sda, logical block 66050
To David Brownell and Matthew Dharm:
I got 4 of these ALi based USB 2.0 cards. So, if you want one of these cards, please send me your postal address. And I will send you one.
Best regards
J�rgen Heinrich
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