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Add support of partition labels for U-Boot by analogy with FNG Boot.

Mikhail Vanyulin requested to merge env-partition-search-by-label into guf_imx_v2020.04-trizeps8plus_2021_12_07

Add support of partition labels for U-Boot by analogy with FNG Boot.

Corresponding code from FNG Boot sources was ported to current version of U-Boot.
A new configuration option is added to U-Boot to determine a storage partition with U-Boot environment by label during boot: CONFIG_ENV_FAT_DEVICE_LABEL.
Herewith the storage device, on which a partition with requested label will be searched, still should be specified via CONFIG_ENV_FAT_DEVICE_AND_PART.

For example:
CONFIG_ENV_FAT_DEVICE_AND_PART="0"
CONFIG_ENV_FAT_DEVICE_LABEL="config"

Notes and limitations:

  • searching routine is not case sensitive (i.e. BOOT and boot will be treated equally);
  • only storages with MBR partition table are supported (i.e. storages with GPT partition table are not supported).
Edited by Mikhail Vanyulin

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