[U-Boot] [PATCH v5 8/8] nand: mxc: Switch NAND SPL to generic SPL

[Benoît Thébaudeau]

On Saturday, February 9, 2013 12:47:25 AM, Benoît Thébaudeau wrote:
> On Friday, February 8, 2013 11:49:27 PM, Benoît Thébaudeau wrote:
> > Subject: [PATCH v5 8/8] nand: mxc: Switch NAND SPL to generic SPL
> > 
> > Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau at advansee.com>
> > ---
> > Changes in v5:
> >  - Remove spaces between function name and open parenthesis.
> >  - Fix mx31pdk and tx25 Makefile-s and SPL linker scripts.
> >  - Remove the useless definition of CONFIG_SPL_LDSCRIPT.
> >  - Fix the call to nand_boot().
> > 
> > Changes in v4:
> >  - New patch.
> > 
> > Changes in v3: None
> > Changes in v2: None
> 
> This is now supposed to be working and compile-tested.
> 
> Custodians, please review and advise.
> 
> Board maintainers, please test.
> 
> Tell me if I should split away some stuff.
> 
> Should doc/README.arm-relocation be updated, and how since tx25 no longer
> uses
> NAND SPL, which is also deprecated?
> 
> Note that mx31pdk and tx25 had been broken by commit
> e05e5de7fae5bec79617e113916dac6631251156. After this commit, for those
> boards,
> _main called board_init_f, which called relocate_code, which unexpectedly
> (for
> their users) returned to nowhere in ctr0.S instead of calling nand_boot.
> Also,
> crt0.S calls nand_boot if CONFIG_SPL_BUILD is not defined but CONFIG_NAND_SPL
> is, which is not normal for NAND SPL. Other NAND SPL boards may be broken
> too,
> but that's not too much of an issue since they are supposed to migrate to
> generic SPL.

I am also wondering if board_init_f should not be moved out of mxc_nand_spl.c to
either <board>/lowlevel_init.S or <board>/<board>.c. That would make
mxc_nand_spl.c more generic if for some reason a board needs to do specific
things. Any opinion?

For the start.S files, since it's not possible to know from CONFIG_SPL_BUILD and
CONFIG_NAND_SPL if relocate_code is needed or not, I see the following choices:
1) Let it defined in all cases. It's quite small, so it won't hurt much.
2) Create a specific SPL #define (e.g. CONFIG_SPL_RELOCATE_CODE) to define it
   for generic SPL only if needed.
3) Just create a specific linker section for it so that it's automatically
   garbage-collected if unneeded.
Any opinion?

Best regards,
Benoît