CPM2 (MPC8260) SMC problem. Please help.
Hi ppl.
I have discovered very very odd problem with SMC2 on my 8260 board. kernel version is 2.6.17.
The board is 8260 with serial ports on SMC1 and SMC 2 (SMC1 - console)
Now if I use SMC2 for communicating with remote device, ( some protocol) I am sending packets and wait for a response.
However if the packet I send is SMALLER than 5 bytes, SMC goes completely crazy. write() doesn't return error, but the next read() hangs completely, and the process moves to D state and it is impossible to kill it by any means. It only happens when consequent writes of smaller than 5 bytes.
I tried to check the driver, but couldn't find any clues to what goes wrong.
I tried both compatibility and platform-based modes with the same results.
Any help on the issue would be highliy appreciated.
Quoted 16 lines · On Wed, 18 Oct 2006 22:40:31 +0200 Boris Shteinbock <[email protected]> wrote:
Hi ppl.
I have discovered very very odd problem with SMC2 on my 8260 board. kernel version is 2.6.17.
The board is 8260 with serial ports on SMC1 and SMC 2 (SMC1 - console)
Now if I use SMC2 for communicating with remote device, ( some protocol) I am sending packets and wait for a response.
However if the packet I send is SMALLER than 5 bytes, SMC goes completely crazy.write()doesn't return error, but the nextread()hangs completely, and the process moves to D state and it is impossible to kill it by any means. It only happens when consequent writes of smaller than 5 bytes. I tried to check the driver, but couldn't find any clues to what goes wrong.
Quoted 5 lines
I tried both compatibility and platform-based modes with the same results.
Any help on the issue would be highliy appreciated.
I think that should be walked along the cpm_uart driver, TX part to see is sending stuff
do not indicate any error in the CPM registers, or at least discover exact track leading to the endless loop.
Signature · 2 lines
Sincerely, Vitaly