[PATCH 1/2] boot: Fix dtbo application by ensuring overlay alignment

[Jamie.Gibbons at microchip.com]

Hi Tom,

On Fri, 2026-01-23 at 14:15 -0600, Tom Rini wrote:
> On Tue, Jan 20, 2026 at 03:33:12PM +0000, Jamie Gibbons wrote:
> 
> > After U-Boot's DTC/libfdt update, device tree overlay application
> > could
> > fail with FDT_ERR_ALIGNMENT due to the overlay DTBO being loaded at
> > a
> > misaligned address. Change the FIT image loader option in image-
> > fit.c
> > from FIT_LOAD_IGNORED to FIT_LOAD_OPTIONAL_NON_ZERO, to ensure
> > overlays
> > are loaded at properly aligned addresses and any alignment errors
> > are
> > resolved.
> > 
> > Tested on: PolarFire SoC Icicle Kit
> > 
> > Fixes: 0535e46d55d ("scripts/dtc: Update to upstream version
> > v1.7.2-35-g52f07dcca47c")
> > Signed-off-by: Jamie Gibbons <jamie.gibbons at microchip.com>
> > ---
> >  boot/image-fit.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/boot/image-fit.c b/boot/image-fit.c
> > index 2d040e38d97..3a327d07784 100644
> > --- a/boot/image-fit.c
> > +++ b/boot/image-fit.c
> > @@ -2481,7 +2481,7 @@ int boot_get_fdt_fit(struct bootm_headers
> > *images, ulong addr,
> >  			addr, &uname, &uconfig,
> >  			arch, IH_TYPE_FLATDT,
> >  			BOOTSTAGE_ID_FIT_FDT_START,
> > -			FIT_LOAD_IGNORED, &ovload, &ovlen);
> > +			FIT_LOAD_OPTIONAL_NON_ZERO, &ovload,
> > &ovlen);
> >  		if (ov_noffset < 0) {
> >  			printf("load of %s failed\n", uname);
> >  			continue;
> 
> After talking with Marek about this more, we think this is the wrong
> approach. Can you please try dropping the load_op test from
> 8fbcc0e0e839
> and seeing if that also fixes your problem? If so, please post a
> patch
> with that and a Fixes tag, thanks!
> 
Dropping the load_op test added in commit 8fbcc0e0e839 does not solve
the issue - failed on fdt_open_into for DTO due to misalignment of ov.

Regards,
Jamie.