AM3354: There any way to change pad function in userspace?

Hi Max,

I did use on this specific case, but technically it is possible to modify PAD config using devmem2, though many things should be considered when doing so. I first noticed your command 'devmem2 <addr> b ...', and believe the PAD config register is 32bit, not 8bit.

Hi again... Well I'he tryed with the command

devmem2 0x44e108f4 w 0x00000012

and I've obained the same result...

My test... Read value

root@silence:/# devmem2 0x44e108f4
/dev/mem opened.
Memory mapped at address 0xb6f71000.
Value at address 0x44E108F4 (0xb6f718f4): 0x30

Try to write the value
root@silence:/# devmem2 0x44e108f4 w 0x00000012
/dev/mem opened.
Memory mapped at address 0xb6f86000.
Value at address 0x44E108F4 (0xb6f868f4): 0x30
Written 0x12; readback 0x12

Read again the value
root@silence:/# devmem2 0x44e108f4
/dev/mem opened.
Memory mapped at address 0xb6f80000.
Value at address 0x44E108F4 (0xb6f808f4): 0x30

Any idea?

Thks

  Max

Ok… how can put the MPU in privileged mode??

Max,

In Linux, the kernel runs in privileged mode, so you can modify Control Module registers in a kernel driver.