PowerQUICC Processors中的主题 Re: t1042rdb eeprom writing problem

t1042rdb eeprom writing problem

love_hate_and_repeat — Wed, 13 Nov 2019 07:42:14 GMT

i'm trying to write eeprom via i2c interface but i could'nt.

i2c eeprom address is 0x50 and i use following u-boot commands.

=>i2c md 0x50 0x00 0x01 // firstly i read 0x0000 eeprom address

0000: ff .

=>i2c mw 0x50 0x00 0x41 0x01 // 0x41 is written to 0x0000 eeprom adress

=>i2c md 0x50 0x00 0x01

0000: ff . // but it's same not changing.

i miss something when i try to write eeprom ?

thanks in advance.

yipingwang — Fri, 15 Nov 2019 08:42:53 GMT

It seems that 0x50 is not the valid address, please refer to the following.

=> i2c md 0x75 0 1
0000: 00 .
=> i2c mw 0x75 0x00 0x41 0x01
=> i2c md 0x75 0 1
0000: 41 A
=>

love_hate_and_repeat — Tue, 12 Jan 2021 14:05:44 GMT

i'm sure eeprom addres is 0x50 and this address was specified in QorIQ T1042DR Reference Design Board Ref Man.

the following is output of i2c probe command.

=>i2c probe

Valid chip addresses : 00 19 36 37 38 40 4C 50 51 68 6A 75

love_hate_and_repeat — Tue, 12 Jan 2021 14:06:15 GMT

the problem was about using i2c command wrongly.

it works like the following;

i2c mw 0x50 0.2 0x41 0x1

thanks.