NAND_CHECK_ERASED_BU(9)

NAME
nand_check_erased_buf - check if a buffer contains (almost) only 0xff data

SYNOPSIS

int nand_check_erased_buf(void * buf, int len, int bitflips_threshold);

ARGUMENTS

buf
    buffer to test

len
    buffer length

bitflips_threshold
    maximum number of bitflips

DESCRIPTION

Check if a buffer contains only 0xff, which means the underlying region has been erased and is ready to be programmed. The bitflips_threshold specify the maximum number of bitflips before considering the region is not erased.

NOTE

The logic of this function has been extracted from the memweight implementation, except that nand_check_erased_buf function exit before testing the whole buffer if the number of bitflips exceed the bitflips_threshold value.

Returns a positive number of bitflips less than or equal to bitflips_threshold, or -ERROR_CODE for bitflips in excess of the threshold.

AUTHOR

Thomas Gleixner <tglx@linutronix.de>
    Author.

COPYRIGHT