MTD NAND Driver Programming Interface
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nand_verify_pages

Name

nand_verify_pages -- [GENERIC] verify the chip contents after a write

Synopsis

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, int oobmode);

Arguments

mtd: MTD device structure
this: NAND chip structure
page: startpage inside the chip, must be called with (page & this->pagemask)
numpages: number of pages to verify
oob_buf: out of band data buffer
oobsel: out of band selecttion structre
chipnr: number of the current chip
oobmode: 1 = full buffer verify, 0 = ecc only

Description

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.

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