[DNX#2006033142000043] [U-Boot-Users] [PATCH] Support for "sleep" mode fo [...]

[DENX Support System]

Hello list,

inside the automatic U-Boot patch tracking system a new ticket
[DNX#2006033142000043] was created:

<snip>
> Here a patch against u-boot 1.1.4 to support "sleep" mode for mips
> processors. I tested this feature on Au1100 based board.
> 
> The patch add a new define CFG_WAKEUP_MODE and a new per-board
> function lowlevel_wakeup().
> 
> The define is used to mask the new function if you don't need "sleep"
> support and the lowlevel_wakeup() is needed since the wake up sequence
> may be different from the boot one.
> 
> Regards,
> 
> Rodolfo
> 
> 
>  cpu/mips/start.S |   59
> +++++++++++++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 53 insertions(+), 6 deletions(-)
> 
> Rodolfo Giometti:
>       Support for "sleep" mode added.
> 
> diff-tree eb1d649... (from 05d8dce...)
> Author: Rodolfo Giometti <giometti at enneenne.com>
> Date:   Fri Mar 31 18:33:38 2006 +0200
> 
>     Support for "sleep" mode added.
> 
> diff-tree eb1d6496e7428e5e6e20887bfb5edd6989d2169f (from
> 05d8dce9d07cf4073ea15fbc448c1ce22b6baf0f)
> Author: Rodolfo Giometti <giometti at zaigor.enneenne.com>
> Date:   Fri Mar 31 18:33:38 2006 +0200
> 
>     Support for "sleep" mode added.
> 
> diff --git a/cpu/mips/start.S b/cpu/mips/start.S
> index e91e213..72f17ee 100644
> --- a/cpu/mips/start.S
> +++ b/cpu/mips/start.S
> @@ -26,6 +26,7 @@
>  #include <config.h>
>  #include <version.h>
>  #include <asm/regdef.h>
> +#include <asm/au1x00.h>
>  #include <asm/mipsregs.h>
>  
>  
> @@ -252,12 +253,6 @@ reset:
>  	nop
>  #endif
>  
> -	/* Initialize any external memory.
> -	 */
> -	la      t9, lowlevel_init
> -	jalr    t9
> -	nop
> -
>  	/* Initialize caches...
>  	 */
>  	la      t9, mips_cache_reset
> @@ -269,6 +264,58 @@ reset:
>  	li	t0, CONF_CM_CACHABLE_NONCOHERENT
>  	mtc0	t0, CP0_CONFIG
>  
> +#ifdef CFG_WAKEUP_MODE
> +	/* Now check the wakeup cause
> +	 */
> +	li      t0, SYS_WAKESRC
> +	lw      t1, 0(t0)
> +	andi    t1, t1, 0x00000002	/* check the SW bit */
> +	beq     zero, t1, 1f
> +	nop
> +
> +#if 0
> +        /* Infinite loop to allow JTAG attach after sleep mode (debug
> only)
> +	 */
> +2:	li      t1, 0
> +        beq	t1, zero, 2b
> +	nop
> +#endif
> +
> +	/* Wakeup any external memory.
> +	 */
> +	la	t9, lowlevel_wakeup
> +	jalr	t9
> +	nop
> +
> +	/* Jump into the Linux code
> +	 */
> +	li	t0, SYS_SCRATCH0
> +	lw      t1, 0(t0)
> +	move	sp, t1
> +	li	t0, SYS_SCRATCH1
> +	lw      t1, 0(t0)
> +	j	t1 			/* this cause a jump into already
> +	nop				   frozen Linux (brr! :) */	
> +
> +	/* If we reach this point we come from a normal system power up,
> +           so just clear the wakeup cause registers and call the
</snip>

Your U-Boot support team