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| author | Robby Cai <R63905@freescale.com> | 2012-08-23 15:47:20 +0800 |
|---|---|---|
| committer | Robby Cai <R63905@freescale.com> | 2012-08-24 16:37:40 +0800 |
| commit | 439a5e37ab1ac43b55b80df92ffcf05fabc3b3f6 (patch) | |
| tree | 0cd6df2b89207a1173bd76e61929f2d23f1239f6 /board/freescale/mx6sl_arm2 | |
| parent | 7ada9f6b7da6b07545d2a5d81704a565e1b6dfeb (diff) | |
| download | u-boot-imx-439a5e37ab1ac43b55b80df92ffcf05fabc3b3f6.zip u-boot-imx-439a5e37ab1ac43b55b80df92ffcf05fabc3b3f6.tar.gz u-boot-imx-439a5e37ab1ac43b55b80df92ffcf05fabc3b3f6.tar.bz2 | |
ENGR00221135: imx6x: clear PowerDown Enable bit of WDOG1_WMCR
From IC spec:
---
The Power down Counter inside WDOG-1 will be enabled out of reset.
This counter has a fixed time-out value of 16 seconds, after which
it will drive the WDOG-1 signal low.
To prevent this, the software must disable this counter by clearing
the PDE bit of Watchdog Miscellaneous Control Register (WDOG_WMCR)
within 16 seconds of reset de-assertion. Once disabled, this counter
cannot be enabled again until the next system reset occurs. This
feature is provided to prevent the hanging up of cores after reset, as
WDOG-1 is not enabled out of reset.
---
NOTE for the last sentence:
This feature requires a dedicated WDOG_B pin for it. The fact that changing
the IOMUX configuration can alter the WDOG_B functionality (GPIO by default)
is not ideal as it defeats the purpose of this feature. But it still
takes effect when the muxed pin is configured as WDOG_B within 16 seconds.
Clear PDE bit to avoid WDOG_B (aka, WDOG-1) assertion.
Tested on MX6SL. May add this for other MX6x.
Signed-off-by: Robby Cai <R63905@freescale.com>
Diffstat (limited to 'board/freescale/mx6sl_arm2')
| -rw-r--r-- | board/freescale/mx6sl_arm2/mx6sl_arm2.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/board/freescale/mx6sl_arm2/mx6sl_arm2.c b/board/freescale/mx6sl_arm2/mx6sl_arm2.c index f14b2b6..8abfd4e 100644 --- a/board/freescale/mx6sl_arm2/mx6sl_arm2.c +++ b/board/freescale/mx6sl_arm2/mx6sl_arm2.c @@ -31,6 +31,7 @@ #include <asm/arch/iomux-v3.h> #include <asm/arch/regs-anadig.h> #include <asm/errno.h> +#include <imx_wdog.h> #ifdef CONFIG_MXC_FEC #include <miiphy.h> #endif @@ -1004,8 +1005,6 @@ void setup_pmic_voltages(void) val |= BF_ANADIG_REG_CORE_REG1_TRG(0x1f); REG_WR(ANATOP_BASE_ADDR, HW_ANADIG_REG_CORE, val); - /*clear PowerDown Enable bit of WDOG1_WMCR*/ - writew(0, WDOG1_BASE_ADDR + 0x08); printf("hw_anadig_reg_core=%x\n", REG_RD(ANATOP_BASE_ADDR, HW_ANADIG_REG_CORE)); #endif @@ -1025,6 +1024,8 @@ int board_init(void) /* address of boot parameters */ gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100; + wdog_preconfig(WDOG1_BASE_ADDR); + setup_uart(); #ifdef CONFIG_MXC_FEC |