[#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