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* [U-Boot] [PATCH v2] Correct corrupted NAND Flash access on KARO TX25 modules
@ 2012-04-02 20:55 Gachet Daniel
  2012-04-02 21:08 ` Marek Vasut
  2012-04-02 21:54 ` stefano babic
  0 siblings, 2 replies; 7+ messages in thread
From: Gachet Daniel @ 2012-04-02 20:55 UTC (permalink / raw)
  To: u-boot

This patch v2 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). 

To solve the problem in a generic way, the proposition is to define a specific value for that bit, CONFIG_NAND_MXC_NFC_ONE_CYCLE. This value could be defined in the specific board configuration file (./include/configs/...). Short description:

CONFIG_NAND_MXC_NFC_ONE_CYCLE enables to specify how to access NAND flash on the i.MX25 CPU.
If CONFIG_NAND_MXC_NFC_ONE_CYCLE is defined, a one-clock cycle will be used to access the NAND flash (symmetric mode); otherwise a two-clock cycle will be used (asymmetric mode).

Signed-off-by: Daniel Gachet <daniel.gachet@hefr.ch>
Cc: stefano babic <sbabic@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	2012-04-02 22:30:13.000000000 +0200
@@ -1290,7 +1290,9 @@ static void mxc_setup_config1(void)
 	uint16_t tmp;
 
 	tmp = readw(&host->regs->nfc_config1);
+#ifdef CONFIG_NAND_MXC_NFC_ONE_CYCLE
 	tmp |= NFC_ONE_CYCLE;
+#endif
 	tmp |= NFC_4_8N_ECC;
 	writew(tmp, &host->regs->nfc_config1);
 	if (host->pagesize_2k)

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2012-04-06 20:16 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-04-02 20:55 [U-Boot] [PATCH v2] Correct corrupted NAND Flash access on KARO TX25 modules Gachet Daniel
2012-04-02 21:08 ` Marek Vasut
2012-04-02 21:56   ` stefano babic
2012-04-02 21:54 ` stefano babic
2012-04-03  5:26   ` Gachet Daniel
2012-04-03 12:28     ` Stefano Babic
2012-04-06 20:16       ` Scott Wood

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