fatload command

Synopsis

fatload <interface> [<dev[:part]> [<addr> [<filename> [bytes [pos]]]]]

Description

The fatload command is used to read a file from a FAT filesystem into memory. You can always use the load command instead.

The number of transferred bytes is saved in the environment variable filesize. The load address is saved in the environment variable fileaddr.

interface

interface for accessing the block device (mmc, sata, scsi, usb, ….)

dev

device number

part

partition number, defaults to 0 (whole device)

addr

load address, defaults to environment variable loadaddr or if loadaddr is not set to configuration variable CONFIG_SYS_LOAD_ADDR

filename

path to file, defaults to environment variable bootfile

bytes

maximum number of bytes to load

pos

number of bytes to skip

addr, bytes, pos are hexadecimal numbers.

If either ‘pos’ or ‘bytes’ are not aligned according to the minimum alignment requirement for DMA transfer (ARCH_DMA_MINALIGN) additional buffering will be used, a misaligned buffer warning will be printed, and performance will suffer for the load.

Example

=> fatload mmc 0:1 ${kernel_addr_r} snp.efi
149280 bytes read in 11 ms (12.9 MiB/s)
=>
=> fatload mmc 0:1 ${kernel_addr_r} snp.efi 1000000
149280 bytes read in 9 ms (15.8 MiB/s)
=>
=> fatload mmc 0:1 ${kernel_addr_r} snp.efi 1000000 100
149024 bytes read in 10 ms (14.2 MiB/s)
=>
=> fatload mmc 0:1 ${kernel_addr_r} snp.efi 10
16 bytes read in 1 ms (15.6 KiB/s)
=>

Configuration

The fatload command is only available if CONFIG_CMD_FAT=y.

Return value

The return value $? is set to 0 (true) if the file was successfully loaded even if the number of bytes is less then the specified length.

If an error occurs, the return value $? is set to 1 (false).