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AM5726: Cannot read device registers from AM5726 uboot

Part Number: AM5726

On other CPUs in this forum I have seen people read device registers from TI uboot using “md” command. but I cannot, all I get all zeros.

for instance md 0x4a003c3c returns 00000000. But  in Linux devmem2 0x4a003c3c returns the proper data. Is this a limitation of this uboot or what? I want to read and set some registers in uboot before boot.

  • Hi Tom,


    md 0x4a003c3c returns 00000000. But  in Linux devmem2 0x4a003c3c returns the proper data. Is this a limitation of this uboot or wha

    This could be most likely because kernel wrote something after you read from U-Boot as long as the clocks are on & you can access the
    registers from U-Boot then you should be reading the right value.

    Your reference:

    This is a PCIe register & has no support on U-Boot so it is not turned on & you read reset value which is 0x0!

    So no issues with md on AM5.


    Best Regards,
    Keerthy