[U-Boot] [PATCH 1/3] powerpc/p5040: enable NAND boot support

[Xie Shaohui-B21989]

> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Thursday, January 17, 2013 4:29 AM
> To: Xie Shaohui-B21989
> Cc: u-boot at lists.denx.de
> Subject: Re: [U-Boot] [PATCH 1/3] powerpc/p5040: enable NAND boot support
> 
> On 01/15/2013 08:39:38 PM, Shaohui Xie wrote:
> > Signed-off-by: Shaohui Xie <Shaohui.Xie at freescale.com>
> > ---
> >  boards.cfg |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> >
> > diff --git a/boards.cfg b/boards.cfg
> > index e4b0d44..8cf4936 100644
> > --- a/boards.cfg
> > +++ b/boards.cfg
> > @@ -855,6 +855,7 @@ P5020DS_SECURE_BOOT          powerpc
> > mpc85xx     corenet_ds          freesca
> >  P5020DS_SPIFLASH	     powerpc     mpc85xx
> > corenet_ds          freescale      -
> > P5020DS:RAMBOOT_PBL,SPIFLASH,SYS_TEXT_BASE=0xFFF80000
> >  P5020DS_SRIO_PCIE_BOOT          powerpc     mpc85xx
> > corenet_ds          freescale      -
> > P5020DS:SRIO_PCIE_BOOT_SLAVE,SYS_TEXT_BASE=0xFFF80000
> >  P5040DS                      powerpc     mpc85xx
> > corenet_ds          freescale
> > +P5040DS_NAND		     powerpc     mpc85xx
> > corenet_ds          freescale      -
> > P5040DS:RAMBOOT_PBL,NAND,SYS_TEXT_BASE=0xFFF80000
> >  BSC9131RDB_SPIFLASH          powerpc     mpc85xx
> > bsc9131rdb          freescale      -
> > BSC9131RDB:BSC9131RDB,SPIFLASH
> >  stxgp3                       powerpc     mpc85xx
> > stxgp3              stx
> >  stxssa                       powerpc     mpc85xx
> > stxssa              stx            -           stxssa
> 
> This needs more explanation.  What sort of image am I supposed to get
> when I build "P5040DS_NAND"?  Where is the PBI?
[S.H] there is already a readme for p3041/p5020/p4080 (doc/README.pblimage), 
With the PBL tool, we will get a ramboot image "u-boot.pbl".
and also the PBI, it is shared by P3/P4/P5.

> 
> What is the long-term plan for fixing the problem of the environment not
> being available until after relocation?  With SPL we could use
> CONFIG_NAND_ENV_DST (which has some issues, but they're fixable).
[S.H] this will need export some NAND read APIs (like load ENV stuff from CONFIG_NAND_ENV_DST),
then they can be reused before relocation even not using SPL.
Please suggest.

> 
> It would also be nice to include instructions for configuring the board
> to boot from NAND in a README 
[S.H] This exist in the above readme.

(Freescale's user manuals often do not make
> this clear, especially for soft configuration).  Also please provide a
> built-in command (or script in the default environment) to soft-boot into
> NAND (or if it already exists, please document it).
[S.H] I was told that when doing ramboot, I should not assume the board has a NOR flash, 
for ex. on customer's board, they may only have NAND. So I did not do this.


Best Regards, 
Shaohui Xie