From 19bd688484322fe62d1a66c8299da6ff9e967ff9 Mon Sep 17 00:00:00 2001 From: Stelian Pop Date: Thu, 22 May 2008 00:15:40 +0200 Subject: Fix boot from NOR due to incorrect reset delay. AT91 RSTC registers are battery-backuped, so their values are not reset across power cycles. One of those registers, the AT91_RSTC_MR register, is being modified by U-Boot, in the ethernet initialisation routine, to generate a 500ms user reset. Unfortunately, this value is not being restored afterwards, causing subsequent resets to also last for 500ms. This long reset sequence causes problems (at least) in the boot sequence from NOR: by the time the CPU tries to load a program from the NOR flash, the latter is still in reset and not yet available. Additionaly, this patch fixes a bug in the original code which caused the reset delay to last for 2s instead of 500ms. Signed-off-by: Stelian Pop Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- board/atmel/at91cap9adk/at91cap9adk.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'board/atmel/at91cap9adk/at91cap9adk.c') diff --git a/board/atmel/at91cap9adk/at91cap9adk.c b/board/atmel/at91cap9adk/at91cap9adk.c index a3eaf19..c5082a0 100644 --- a/board/atmel/at91cap9adk/at91cap9adk.c +++ b/board/atmel/at91cap9adk/at91cap9adk.c @@ -196,7 +196,7 @@ static void at91cap9_macb_hw_init(void) /* Need to reset PHY -> 500ms reset */ at91_sys_write(AT91_RSTC_MR, AT91_RSTC_KEY | - AT91_RSTC_ERSTL | (0x0D << 8) | + (AT91_RSTC_ERSTL & (0x0D << 8)) | AT91_RSTC_URSTEN); at91_sys_write(AT91_RSTC_CR, AT91_RSTC_KEY | AT91_RSTC_EXTRST); @@ -204,6 +204,11 @@ static void at91cap9_macb_hw_init(void) /* Wait for end hardware reset */ while (!(at91_sys_read(AT91_RSTC_SR) & AT91_RSTC_NRSTL)); + /* Restore NRST value */ + at91_sys_write(AT91_RSTC_MR, AT91_RSTC_KEY | + (AT91_RSTC_ERSTL & (0x0 << 8)) | + AT91_RSTC_URSTEN); + /* Re-enable pull-up */ writel(pin_to_mask(AT91_PIN_PB22) | pin_to_mask(AT91_PIN_PB25) | -- cgit v1.1