usage of i2c read command in U-Boot

[TJann.1]

Hi,

I have a custom board with a ST32MP157C and a 24AA025E48 on a i2c bus.

In the U-Boot, I want to read the MAC address located in the 24AA025E48 on the i2c bus 1 at address 0x53 at offset 0xFA.

When I can use the following commands it works (MAC Address: 80:1F:12:36:36:7B)

STM32MP> i2c dev 1

Setting bus to 1

STM32MP> i2c md 53 FA 6

00fa: 80 1f 12 36 36 7b ...66{

STM32MP>

but when i use the i2c read it does not answer anything.

STM32MP> i2c read 53 1 6 FA

STM32MP>

what is wrong with the command ?

who can i do to store the result in a variable in order to change the board ethernet mac address ?

Thanks.

[KnarfB · Accepted solution]

> what is wrong with the command ?

The i2c read command takes the same parameters as md plus one last parameter which is a MPU memory address. The values are read from I2C and written to that memory address, not dumped to the console.

[TJann.1]

Hello,

thanks, now it works with the command i2c read 53 FA 6 C0000000

best regards.