Backup and restore U-Boot environment on AMC1

1 Preparation

Boot into U-Boot and stop execution by pressing a key

U-Boot 2017.01 (Nov 14 2017 - 13:37:55 +0100)

CPU  : AM437X-GP rev 1.2
I2C:   ready
DRAM:  512 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
SF: Detected w25q64cv with page size 256 Bytes, erase size 4 KiB, total 8 MiB, m
apped at 30000000
In:    serial
Out:   serial
Err:   serial
Net:   cpsw
Hit any key to stop autoboot:  0
AMC1>

To access the on-board QSPI Flash you need to execute the sf probe command at least once:

AMC1> sf probe
SF: Detected w25q64cv with page size 256 Bytes, erase size 4 KiB, total 8 MiB, m
apped at 30000000
AMC1>

2 Backup environment

Load environment from serial FLASH to RAM

sf read ${loadaddr} 0x100000 0x10000

Write to backup section

sf erase 0x110000 0x10000
sf write ${loadaddr} 0x110000 0x10000

3 Restore environment

Load environment from backup section in serial FLASH to RAM

sf read ${loadaddr} 0x110000 0x10000

Write to environment section in serial FLASH

sf erase 0x100000 0x10000
sf write ${loadaddr} 0x100000 0x10000

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4 Additional Tags

Serial FLASH mapping on AMC1
Serial FLASH programming via U-Boot on AMC1
Reset U-Boot environment on AMC1