Reading BOOT_MODE[1,0] register

[shonysinay]

hi,

Can I read in u-boot the BOOT_MODE[1,0] register? How?

Thans,

Shony

[igorpadykov]

Hi Shony

it can be read using register SRC_SBMR2.

Best regards

igor

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[shonysinay]

Igor, since I am not software engineer I don't even know the exact command. Please write the exact command for reading the SRC_SBMR2.

Thanks,

Shony

[igorpadykov]

Hi Shony

one can attach jtag and read SRC_SBMR2.

Best regards

igor

[Mestkim]

Igor,

Till now, you did ask which chip it is. 

Do you also feel shame of yourself. 

[shonysinay]

I don't have JTAG. I download the u-boot through the serial port.

Can't I some u-boot command?

[Mestkim]

You are not a software engineer. But you are not an engineer at all.

Till now, you did say which i.MX chip you are using, i.MX6, i.MX8MM or others. 

Do you feel shame of yourself? 

[joaofl]

For the IMX8MP, those flags are located at the following address:

```
# the BOOT_MODE register
boot_mode_bits_addr=0x30390073

```

You can find the exact address for your variant on its datasheel.

Then I just compared the values on that register to the one I'm expecting:

`cmp.b ${boot_mode_bits_addr} 0x2 1`

I compare the first byte of the content on `boot_mode_bits_addr` with `0x2`, and `test` to see if the result is 0 or 1.