en:bpi-r4:start
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en:bpi-r4:start [2024/04/21 12:48] – [thermal] frank | en:bpi-r4:start [2024/04/21 13:26] – [eeprom] frank | ||
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===== GPIO ===== | ===== GPIO ===== | ||
{{ : | {{ : | ||
+ | |||
+ | ===== eeprom ===== | ||
+ | |||
+ | BPI-R4 has an eeprom on i2c-mux channel 0 | ||
+ | |||
+ | [ 1.515672] at24 2-0057: 256 byte 24c02 EEPROM, writable, 1 bytes/write | ||
+ | |||
+ | write-mode (wp-gpio is linked to green led): | ||
+ | < | ||
+ | # echo 0 > / | ||
+ | root@bpi-r4-v11: | ||
+ | # echo " | ||
+ | root@bpi-r4-v11: | ||
+ | # hexdump -C / | ||
+ | 00000000 | ||
+ | 00000010 | ||
+ | * | ||
+ | 00000100 | ||
+ | root@bpi-r4-v11: | ||
+ | # echo 1 > / | ||
+ | root@bpi-r4-v11: | ||
+ | </ | ||
+ | |||
+ | ===== rtc ===== | ||
+ | |||
+ | TBD | ||
===== uboot/ATF ===== | ===== uboot/ATF ===== |
en/bpi-r4/start.txt · Last modified: 2024/05/07 07:56 by frank