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fdt: Introduce helper method fdt_overlay_apply_verbose()

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Introduce fdt_overlay_apply_verbose, a method that applies an
overlay but in the case of an error produces a helpful message.

In addition if a base tree is found to be missing the __symbols__
node the message will point out that the probable reason is that
the base tree was miscompiled without the -@ option.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Pantelis Antoniou 2017-09-04 23:12:11 +03:00 • committed by Simon Glass
parent 18c991ca2b
commit fc7c31891c
2 changed files with 33 additions and 0 deletions
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31
common/fdt_support.c
View file

@ -1655,3 +1655,34 @@ int fdt_fixup_display(void *blob, const char *path, const char *display)
}
return toff;
}
#ifdef CONFIG_OF_LIBFDT_OVERLAY
/**
* fdt_overlay_apply_verbose - Apply an overlay with verbose error reporting
*
* @fdt: ptr to device tree
* @fdto: ptr to device tree overlay
*
* Convenience function to apply an overlay and display helpful messages
* in the case of an error
*/
int fdt_overlay_apply_verbose(void *fdt, void *fdto)
{
int err;
bool has_symbols;
err = fdt_path_offset(fdt, "/__symbols__");
has_symbols = err >= 0;
err = fdt_overlay_apply(fdt, fdto);
if (err < 0) {
printf("failed on fdt_overlay_apply(): %s\n",
fdt_strerror(err));
if (!has_symbols) {
printf("base fdt does did not have a /__symbols__ node\n");
printf("make sure you've compiled with -@\n");
}
}
return err;
}
#endif

2
include/fdt_support.h
View file

@ -264,6 +264,8 @@ int arch_fixup_memory_node(void *blob);
int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
u32 height, u32 stride, const char *format);
int fdt_overlay_apply_verbose(void *fdt, void *fdto);
#endif /* ifdef CONFIG_OF_LIBFDT */
#ifdef USE_HOSTCC