Patchwork [U-Boot] at91sam9x5: set default EBI I/O drive configuration.

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Submitter Wu, Josh
Date Sept. 6, 2012, 8:14 a.m.
Message ID <1346919268-29794-1-git-send-email-josh.wu@atmel.com>
Download mbox | patch
Permalink /patch/182079/
State Accepted
Delegated to: Andreas Bießmann
Headers show

Comments

Wu, Josh - Sept. 6, 2012, 8:14 a.m.
This patch configure at91sam9x5's EBI drive I/O. Without this, When SD card boot, the nand flash read/write are not stable. Which will cause kernel MTD test fail (Since mainline kernel doesn't configure the EBI register).

Signed-off-by: Josh Wu <josh.wu@atmel.com>
---
 board/atmel/at91sam9x5ek/at91sam9x5ek.c |    4 ++++
 1 file changed, 4 insertions(+)
Andreas Bießmann - Sept. 13, 2012, 12:33 p.m.
Dear Josh Wu,

On 06.09.2012 10:14, Josh Wu wrote:
> This patch configure at91sam9x5's EBI drive I/O. Without this, When SD card boot, the nand flash read/write are not stable. Which will cause kernel MTD test fail (Since mainline kernel doesn't configure the EBI register).
> 
> Signed-off-by: Josh Wu <josh.wu@atmel.com>
> ---

applied to u-boot-atmel/master, thanks!

Best regards

Andreas Bießmann

Patch

diff --git a/board/atmel/at91sam9x5ek/at91sam9x5ek.c b/board/atmel/at91sam9x5ek/at91sam9x5ek.c
index ae408bc..06028aa 100644
--- a/board/atmel/at91sam9x5ek/at91sam9x5ek.c
+++ b/board/atmel/at91sam9x5ek/at91sam9x5ek.c
@@ -62,6 +62,10 @@  static void at91sam9x5ek_nand_hw_init(void)
 	csa |= AT91_MATRIX_EBI_CS3A_SMC_SMARTMEDIA;
 	/* NAND flash on D16 */
 	csa |= AT91_MATRIX_NFD0_ON_D16;
+
+	/* Configure IO drive */
+	csa &= ~AT91_MATRIX_EBI_EBI_IOSR_NORMAL;
+
 	writel(csa, &matrix->ebicsa);
 
 	/* Configure SMC CS3 for NAND/SmartMedia */