[U-Boot-Users] Booting MPC8272ADS from flash base

[alebas at televes.com]

Alex,

Again at work. I have some comment over those changes

> For the record here is the change I needed to make to u-boot-1.1.3.
>
> Index: board/mpc8260ads/config.mk
> ===================================================================
> RCS file: /newcvs/pq2-linux/u-boot/board/mpc8260ads/config.mk,v
> retrieving revision 1.1.1.1
> diff -u -r1.1.1.1 config.mk
> --- board/mpc8260ads/config.mk	24 Aug 2005 12:16:55 -0000	1.1.1.1
> +++ board/mpc8260ads/config.mk	14 Oct 2005 08:36:46 -0000
> @@ -29,4 +29,4 @@
>  # MPC8260ADS, MPC8266ADS, and PQ2FADS-ZU/VR boards
>  #
>
> -TEXT_BASE = 0xfff00000
> +TEXT_BASE = 0xff800000

Are you sure you are using u-boot-1.1.3?
Patch from Jerry Van Baren already made some changes to this file
to allow the use of a different TEXT__BASE for lowboot in MPC8272ADS
selecting it from Makefile config target.
I have this changes already applied in 1.1.3.

> Index: include/configs/MPC8260ADS.h
> ===================================================================
> RCS file: /newcvs/pq2-linux/u-boot/include/configs/MPC8260ADS.h,v
> retrieving revision 1.1.1.1
> diff -u -r1.1.1.1 MPC8260ADS.h
> --- include/configs/MPC8260ADS.h	24 Aug 2005 12:17:01 -0000	1.1.1.1
> +++ include/configs/MPC8260ADS.h	14 Oct 2005 08:36:46 -0000
> @@ -294,13 +294,8 @@
>  #define CFG_GBL_DATA_OFFSET	(CFG_INIT_RAM_END - CFG_GBL_DATA_SIZE)
>  #define CFG_INIT_SP_OFFSET	CFG_GBL_DATA_OFFSET
>
> +#define CFG_HRCW_MASTER 0x0e72b605   /* like BCSR version, but with CIP=1,
> BMS=1 */


In order lowboot patch from Jerry to work (which has been applied to
u-boot source, so I recommned you to use) in MPC8272ADS, ISB must also
be ISB=100, not ISB=010 as in BCSR.

Also, from MPC8272RM, bits 20-21 are reserved and should be cleared.
So, LBPC=00, although 01 works.

And finally a question. You use MODCK_H = 0101 whereas I use in my
patch MODCK_H=1010, while trying to set MODCK to 1010_100.
Am I mis-understanding something?


Best regards,

Alex Bastos