[U-Boot] U-boot memory dump

[U-Boot] U-boot memory dump

[alfred steele]

Hi,
I am using uboot  on the MX31 PDk board.  I am trying to dump the
contents of a status register found at location 50004004. This status
register shows the status of the SDHC( SD card host controller)  like
interrupt , card insertion, card removal etc. According to the MX31
manual, the status register i.e the contents at the corresponding
memory location should change on events like card insertion and
removal. But  the contents aren't changing as expected.
I have verified this with Linux and it works.

i) Before card insertion
=> md.l  50004004
50004004: 30004000 00000008 00000000 00000040
ii)After card insertion
=>  md.l  50004004
50004004: 30004000 00000008 00000000 00000040

Could anything be wrong with my u-boot image or the memory
initialization(although anything going wrong with  the init dosent
make sense).

Thanks in advance!
Thanks,
Alfred

[U-Boot] U-boot memory dump

[Daniel Mack]

On Sat, Apr 25, 2009 at 11:41:43AM -0500, alfred steele wrote:
> I am using uboot  on the MX31 PDk board.  I am trying to dump the
> contents of a status register found at location 50004004. This status
> register shows the status of the SDHC( SD card host controller)  like
> interrupt , card insertion, card removal etc. According to the MX31
> manual, the status register i.e the contents at the corresponding
> memory location should change on events like card insertion and
> removal. But  the contents aren't changing as expected.
> I have verified this with Linux and it works.

The difference is most probably that under Linux, your IOMUX is set up
correctly. IOW, the CPU does not see any external peripherals unless
you enable the pins for the specific function you're trying to use.

Daniel