Provided by: linux-doc-2.6.15_2.6.15-23.39_all
nand_verify_pages - [GENERIC] verify the chip contents after a write
int nand_verify_pages (struct mtd_info * mtd, struct nand_chip * this,
int page, int numpages, u_char * oob_buf,
struct nand_oobinfo * oobsel, int chipnr,
mtd MTD device structure
this NAND chip structure
page startpage inside the chip, must be called with (page &
number of pages to verify
out of band data buffer
oobsel out of band selecttion structre
chipnr number of the current chip
1 = full buffer verify, 0 = ecc only
The NAND device assumes that it is always writing to a cleanly erased
page. Hence, it performs its internal write verification only on bits
that transitioned from 1 to 0. The device does NOT verify the whole
page on a byte by byte basis. It is possible that the page was not
completely erased or the page is becoming unusable due to wear. The
read with ECC would catch the error later when the ECC page check
fails, but we would rather catch it early in the page write stage.
Better to write no data than invalid data.
Thomas Gleixner <email@example.com>.