[#5748] serial is very slow and can lose char when enabling DMA and MPU in trunk head on BF537

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[#5748] serial is very slow and can lose char when enabling DMA and MPU in trunk head on BF537

Submitted By: Barry Song

Open Date

2009-12-06 22:45:16     Close Date

2010-06-11 04:37:37

Priority:

Medium     Assignee:

Nobody

Status:

Closed     Fixed In Release:

N/A

Found In Release:

2010R1     Release:

Category:

Drivers     Board:

N/A

Processor:

BF537     Silicon Revision:

Is this bug repeatable?:

Yes     Resolution:

Duplicate

Uboot version or rev.:

    Toolchain version or rev.:

gcc 4.3.4 (svn-3672)

App binary format:

N/A     

Summary: serial is very slow and can lose char when enabling DMA and MPU in trunk head on BF537

Details:

 

On MPU system, when serial enables DMA, after kernel boots to shell, serial will be very slow and can block system sometimes. And after inputing commands, the output will lose many char, for example:

root:/>

root:;34musr

dev   home  lib   proc  sbin  tmp   var

root:/> :/>

root:/>

root:/>

root:/>

root:/>

root:/> 4metc   init  mnt   root  sys   usr

root:/> me  lib   proc  :/>

root:/>

root:/>

root:/> r

root:/>

root:/>

root:/>

root:/>

root:/>

root:/>

root:/>

root:/>

root:/> root  :/>

root:/>

root:/>

root:/> mdev   home  lib   proc

root:/>                         root:/>

root:/>

root:/>

root:/>

root:/>

root:/>

root:/>

root:/> c   init  mnt   root  sys

 

Attached Kconfig.

 

Follow-ups

 

--- Sonic Zhang                                              2009-12-06 22:56:39

Duplicated bug of 5739.

 

 

 

    Files

    Changes

    Commits

    Dependencies

    Duplicates

    Associations

    Tags

 

File Name     File Type     File Size     Posted By

mpu_serial_dma.config    application/octet-stream    35461    Barry Song

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