USB issues after switching to PSRAM

Hi everyone,

My development board has two memory banks, SDRAM (128MB) and PSRAM (16MB). I've got the linux kernel booting from only the PSRAM, but I can't get a USB Flash Drive to work properly. It is being detected, but I get the following messages:
---------------------------------------------------------------
usb 1-1: reset high speed USB device using fsl-ehci and address 4
sd 2:0:0:0: [sda] Result: hostbyte=0x05 driverbyte=0x00
end_request: I/O error, dev sda, sector 0
Buffer I/O error on device sda, logical block 0
---------------------------------------------------------------

This ONLY occurs when I use the PSRAM on the board. I've made no changes to the drivers and my changes to kernel source were minimal. I only changed the following (zreladdr, param_phys-y, PHYS_OFFSET).

I'm at a complete loss on how to fix this but it's critical for me to use PSRAM. Any help is greatly appreciated.

Thanks!

Originally Posted by sg83 Hi everyone, My development board has two memory banks, SDRAM (128MB) and PSRAM (16MB). I've got the linux kernel booting from only the PSRAM, but I can't get a USB Flash Drive to work properly. It is being detected, but I get the following messages: --------------------------------------------------------------- usb 1-1: reset high speed USB device using fsl-ehci and address 4 sd 2:0:0:0: [sda] Result: hostbyte=0x05 driverbyte=0x00 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 --------------------------------------------------------------- This ONLY occurs when I use the PSRAM on the board. I've made no changes to the drivers and my changes to kernel source were minimal. I only changed the following (zreladdr, param_phys-y, PHYS_OFFSET). I'm at a complete loss on how to fix this but it's critical for me to use PSRAM. Any help is greatly appreciated. Thanks!

To add some more info, the /proc/<pid>/status for the usb-storage processes shows that it is in the "D" state forever. It also shows:

voluntary_ctxt_switches: 182
nonvoluntary_ctxt_switch: 50

When I use SDRAM, the nonvoluntary_ctxt_switches are not nearly as high