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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 08-12-2008, 06:47 PM   #1
sg83
LQ Newbie
 
Registered: Jun 2008
Location: SF Bay Area
Distribution: Ubuntu
Posts: 15

Rep: Reputation: 1
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!
 
Old 08-13-2008, 04:08 PM   #2
sg83
LQ Newbie
 
Registered: Jun 2008
Location: SF Bay Area
Distribution: Ubuntu
Posts: 15

Original Poster
Rep: Reputation: 1
Quote:
Originally Posted by sg83 View Post
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
 
  


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