AM3352: print soc registers in booted linux

e f

Part Number: AM3352

Tool/software:

Is there a way to read registers from soc on booted linux?

0 Hong Guan64 9 months ago

One option is "devmem2 soc_reg_addr" once kernel boots up.
Best,
-Hong

0 e f 9 months ago in reply to Hong Guan64

How to get soc_reg_addr? Example?

0 Hong Guan64 9 months ago in reply to e f

You'll find AM335x SoC MMR addressed from AM335x TRM.
https://www.ti.com/lit/pdf/spruh73
Best,
-Hong

+1 e f 9 months ago in reply to Hong Guan64

Example

Example for devmem

get

base address of CM_PER: 0x44E0_0000 (from page 179 in https://www.ti.com/lit/pdf/spruh73)

offset of CM_PER_MCASP0: 34h

enable CLK (0x2 is for value for enabling clock)

root@Testboard:~# devmem2 0x44e00034 w 0x2

/dev/mem opened.

Memory mapped at address 0xb6f4e000.

Value at address 0x44E00034 (0xb6f4e034): 0x2

read

root@Testboard:~# devmem2 0x44e00034 0x2

/dev/mem opened.

Memory mapped at address 0xb6f4e000.

Value at address 0x44E00034 (0xb6f4e034): 0x2

read also other e.g. McASP0 DMA 0x4600_0000

root@Testboard:~# devmem2 0x46000000

/dev/mem opened.

Memory mapped at address 0xb6f8b000.

Value at address 0x46000000 (0xb6f8b0b8): 0x0

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