[PATCH v2] board_f: Add support for CONFIG_OF_BOARD_FIXUP for XIP images

[Marek Behún]

On Mon, 21 Nov 2022 12:45:32 -0500
Tom Rini <trini at konsulko.com> wrote:

> On Mon, Nov 21, 2022 at 06:42:01PM +0100, Pali Roh_r wrote:
> > + Tom
> > 
> > On Wednesday 02 November 2022 00:23:03 Pali Roh_r wrote:  
> > > On Monday 10 October 2022 17:48:58 Simon Glass wrote:  
> > > > Hi,
> > > > 
> > > > On Sun, 28 Aug 2022 at 09:19, Marek Beh_n <kabel at kernel.org> wrote:  
> > > > >
> > > > > From: Pali Roh_r <pali at kernel.org>
> > > > >
> > > > > When U-Boot is running from flash memory (execute in place) then
> > > > > gd->fdt_blob before relocation points to read-only flash memory.
> > > > >
> > > > > So U-Boot calls board_fix_fdt() with read-only gd->fdt_blob pointer which
> > > > > cause immediate CPU crash when callback is trying to modify gd->fdt_blob.
> > > > >
> > > > > Fix this issue by introducing a new config option
> > > > > OF_DTB_READONLY_BEFORE_RELOC which moves fix_fdt callback after the
> > > > > reloc_fdt callback. This makes CONFIG_OF_BOARD_FIXUP working also if
> > > > > U-Boot before relocation is not running from read/write (S)RAM memory.
> > > > >
> > > > > This is required for mpc85xx boards when booting from flash NOR.
> > > > >
> > > > > Signed-off-by: Pali Roh_r <pali at kernel.org>
> > > > > Signed-off-by: Marek Beh_n <kabel at kernel.org>
> > > > > ---
> > > > > Changes since v1:
> > > > > - just changed the new Kconfig option name and associated help string
> > > > > ---
> > > > >  common/board_f.c | 8 +++++++-
> > > > >  dts/Kconfig      | 6 ++++++
> > > > >  2 files changed, 13 insertions(+), 1 deletion(-)  
> > > > 
> > > > Can we just make this the normal behaviour? I think it makes more
> > > > sense to change the FDT after we have relocated it.  
> 
> Can we?
> 

Sorry, I didn't notice this thread. Do we know if there aren't boards
that change fdt before reloc?

Marek