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

Nishanth Menon
2010-11-04T15:46:53Z

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