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bios: add flash_transfer_cmd #2106

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Allows to send arbitrary SPI CMDs to the FLASH.

Examples (depending on flash chip):

  • flash_transfer_cmd 0x9F 0x00 0x00 0x00 -> Read ID reg
  • flash_transfer_cmd 0x06 0x01 0x00 -> Global write protect off

Mostly useful to check status, turn on/off write protection etc.

Allows to send arbitrary SPI CMDs to the FLASH.
Examples (depending on flash chip):
  - flash_transfer_cmd 0x9F 0x00 0x00 0x00 -> Read ID reg
  - flash_transfer_cmd 0x06 0x01 0x00 -> Global write protect off
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