AnsweredAssumed Answered

uboot can not read/write DMA CCSR registers?

Question asked by steven chen on Apr 16, 2013
Latest reply on Apr 17, 2013 by Yiping Wang

I have a custom mpc8548 board with custom uboot U-Boot 2009.01

 

bdinfo

memstart    = 0x00000000

memsize     = 0x80000000

flashstart  = 0xFC000000

flashsize   = 0x00800000

flashoffset = 0x00000000

sramstart   = 0x00000000

sramsize    = 0x00000000

immr_base   = 0xE0000000

bootflags   = 0xF5001001

intfreq     =   1500 MHz

busfreq     =    500 MHz

 

but it seems that I cannot read/write to dma ccsr registers ccsrbar @e000_0000 and dma mr @21100 (offset)

eCCM=> md e0021100

e0021100: 00000000 00000000 00000000 00000000    ................

e0021110: 00000000 00000000 00000000 00000000    ................

e0021120: 00000000 00000000 00000000 00000000    ................

eCCM=> mw e0021100  404

eCCM=> md e0021100    

e0021100: 00000000 00000000 00000000 00000000    ................

e0021110: 00000000 00000000 00000000 00000000

 

has anyone seen similar issue?

 

thanks,

 

 

 

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