[U-Boot] [PATCH] OMAP4: speed up booting on Pandaboard

[Nishanth Menon <menon.nishanth@gmail.com>]

Sergiy Kibrik wrote, on 11/04/2010 05:38 AM:
> Improved default config for OMAP4 Pandaboard for faster boot:
> 	-reduced environment size to speed up memory initialization;
> 	-USB TTY driver turned off;
Do we really want to do this?
> 	-tweaked blob load address to avoid image relocation (according to default uImage load address);
>
> Signed-off-by: Sergiy Kibrik<sergiy.kibrik@globallogic.com>
What kind of savings did we get? I am guessing we have some time x savings..

> ---
>   include/configs/omap4_panda.h |    8 ++++----
>   1 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/include/configs/omap4_panda.h b/include/configs/omap4_panda.h
> index 74defab..5aba424 100644
> --- a/include/configs/omap4_panda.h
> +++ b/include/configs/omap4_panda.h
> @@ -62,10 +62,10 @@
>
>   /*
>    * Size of malloc() pool
> - * Total Size Environment - 256k
> + * Total Size Environment - 2k
>    * Malloc - add 256k
>    */
> -#define CONFIG_ENV_SIZE			(256<<  10)
> +#define CONFIG_ENV_SIZE			(256<<  4)
/me likes the change, but not sure how it saves boot time.

>   #define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + (256<<  10))
>   						/* initial data */
>   /* Vector Base */
> @@ -117,7 +117,7 @@
>
>   /* USB device configuration */
>   #define CONFIG_USB_DEVICE		1
> -#define CONFIG_USB_TTY			1
> +#undef CONFIG_USB_TTY
do we need to have the undef? it might be better to just drop the define 
perhaps? what impact do we have on boot time with this change?

>   #define CONFIG_SYS_CONSOLE_IS_IN_ENV	1
>
>   /* Flash */
> @@ -146,7 +146,7 @@
>   #define CONFIG_ENV_OVERWRITE
>
>   #define CONFIG_EXTRA_ENV_SETTINGS \
> -	"loadaddr=0x82000000\0" \
> +	"loadaddr=0x80007FC0\0" \
btw, Dumb question: how did we decide on this address? building from 
kernel.org, I see System.map @ c0004000 ==> 80004000

when I do make uImage,
/bin/bash /home/nmenon/Src/opensource/linux-2.6/scripts/mkuboot.sh -A 
arm -O linux -T kernel -C none -a 0x80008000 -e 0x80008000 -n 
'Linux-2.6.37-rc1-00005-gd88c092'


Regards,
Nishanth Menon