[U-Boot] [PATCH] Correct corrupted NAND Flash access on KARO TX25 modules

Gachet Daniel Daniel.Gachet at hefr.ch
Sat Mar 31 09:31:40 CEST 2012

This short patch correct corrupted data while reading NAND flash modules on the KARO TX25 module.

The current version of the mxc_nand driver uses the symmetric mode to access the NAND flash, but the devices populated on the KARO TX25 only support an asymmetric mode (i.MX25: bit 8  within NAND_FLASH_CONFIG1 register cleared). 

Signed-off-by: Daniel Gachet <daniel.gachet at hefr.ch>
Cc: Wolfgang Denk <wd at denx.de >

diff -upr drivers/mtd/nand/mxc_nand.c drivers/mtd/nand/mxc_nand.c
--- drivers/mtd/nand/mxc_nand.c	2011-12-23 20:25:35.000000000 +0100
+++ drivers/mtd/nand/mxc_nand.c	2012-03-30 08:10:13.000000000 +0200
@@ -1290,7 +1290,9 @@ static void mxc_setup_config1(void)
 	uint16_t tmp;
 	tmp = readw(&host->regs->nfc_config1);
+#ifndef MACH_TYPE_TX25
 	tmp |= NFC_ONE_CYCLE;
 	tmp |= NFC_4_8N_ECC;
 	writew(tmp, &host->regs->nfc_config1);
 	if (host->pagesize_2k)

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