fitimage: Allow match against config node name

[Ahmad Fatoum]

Hello Hans,

On 16.09.22 15:36, Hans Christian Lønstad wrote:
> Support fitimage configuration nodes without populated compatible fields
> 
> Yocto fit image recipe does not populate the compatible field
> in the generated ITS file configuration nodes.
> Barebox is thus only able to load the default configuration
> preventing the use of variant based bootloader update bundles.
> 
> If the compatible match fails, fall through using a global
> variable boot.fitnode allowing a match against the configuration
> node name.
> 
> This allows variant boards to pick the correct configuration.

Thanks for your patch.

> 
> ---
> common/image-fit.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
> 
> diff --git a/common/image-fit.c b/common/image-fit.c
> index a410632d70..f92e813a8b 100644
> --- a/common/image-fit.c
> +++ b/common/image-fit.c
> @@ -7,6 +7,7 @@
> 
> #define pr_fmt(fmt) "FIT: " fmt
> #include <common.h>
> +#include <environment.h>
> #include <init.h>
> #include <bootm.h>
> #include <libfile.h>
> @@ -663,6 +664,7 @@ static int fit_find_compatible_unit(struct device_node *conf_node,
> struct device_node *barebox_root;
> const char *machine;
> int ret;
> + const char *config_node;
> 
> barebox_root = of_get_root_node();
> if (!barebox_root)
> @@ -680,6 +682,22 @@ static int fit_find_compatible_unit(struct device_node *conf_node,
> }
> }
> 
> + /*
> + * If the match against compatible in config node does not match
> + * (or is missing as in Yocto fitimage recipe)
> + * check for matching node name using global.boot.fitnode
> + */
> + config_node = getenv("global.boot.fitnode");
> + if (config_node) {
> + for_each_child_of_node (conf_node, child) {
> + if (strcmp(child->name, config_node) == 0) {
> + *unit = child->name;
> + pr_info("matching node name unit '%s' found\n", *unit);
> + return 0;
> + }
> + }
> + }

Whitespace is broken (git send-email normally does the correct thing).

But are you aware that you can have your boot-target like:

bootm /dev/mmc0.fit at configuration1

and that configuration1 will be chosen? Does this already cover
your use case? If it does, a documentation patch adding this
information at the place where you didn't find it is surely
a welcome alternate contribution. ;)

(also generally speaking magicvars need to be documented with
 BAREBOX_MAGICVAR).

Cheers,
Ahmad


> +
> default_unit:
> pr_info("No match found. Trying default.\n");
> if (of_property_read_string(conf_node, "default", unit) == 0)


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