Hi,
On 21.09.23 14:37, Ahmad Fatoum wrote:
> On 20.09.23 14:37, Rouven Czerwinski wrote:
>> The blspec.compatible.extra variable will be used to specify extra
>
> As this is only relevant when booting. Maybe prefix with boot.?
> Not sure if that wouldn't be too long..
We may also want to use this for other stuff than blspec in future,
e.g. FIT or matching overlays by compatible, so I think we should do away
with both blspec and boot and call it maybe global.of.compatible.extra?
If you agree, please define the variable in common/misc.c or some other
common location.
>
>> compatibles that are also used to match during bootloader specification
>> entry parsing. This means that even if your internal barebox device tree
>> machine compatible is "vendor,bareboxcompatible", but your bootloader
>> specification device tree contains "vendor,linuxcompatible", it is
>> possible to boot this entry by setting blspec.compatible.extra to
>> "vendor,linuxcompatible".
>>
>> More than one compatible is possible as well, the compatibles will need
>> to be space separated (since "," is already used for the vendor hardware
>> distinction).
>>
>> Signed-off-by: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
>> ---
>> common/blspec.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 56 insertions(+)
>>
>> diff --git a/common/blspec.c b/common/blspec.c
>> index f8d47f20d2..e361a02333 100644
>> --- a/common/blspec.c
>> +++ b/common/blspec.c
>> @@ -19,10 +19,20 @@
>> #include <net.h>
>> #include <fs.h>
>> #include <of.h>
>> +#include <magicvar.h>
>> +#include <linux/list.h>
>> #include <linux/stat.h>
>> #include <linux/err.h>
>> #include <mtd/ubi-user.h>
>>
>> +struct list_head *blspec_extra_list;
>> +char *blspec_extra_string;
>> +
>> +struct blspec_extra_entry {
>> + char *compatible;
>> + struct list_head list;
>> +};
>> +
>> /*
>> * blspec_entry_var_set - set a variable to a value
>> */
>> @@ -830,8 +840,54 @@ static int blspec_bootentry_provider(struct bootentries *bootentries,
>> return found;
>> }
>>
>> +static int blspec_extra_set(struct param_d *p, void *priv)
>> +{
>> + struct blspec_extra_entry *entry, *tmp;
>> + char *str = blspec_extra_string;
>> + char *temp = str;
>> + unsigned int len;
>> +
>> + if (blspec_extra_list) {
>> + list_for_each_entry_safe(entry, tmp, blspec_extra_list, list) {
>> + list_del(&entry->list);
>> + free(entry->compatible);
>> + free(entry);
>> + }
>> + blspec_extra_list = NULL;
>> + }
>> +
>> + while(str++) {
>> + if (*str == ' ' || *str == 0) {
>
> Please use strsep (or strsep_unescaped) as elsewhere in blspec.c.
>
>> + len = temp - str;
>> + if(len > 126) {
>> + len = 127;
>> + }
>> + entry = calloc(1, sizeof(struct blspec_extra_entry));
>
> xzalloc if you don't check for !NULL.
>
>> + entry->compatible = xzalloc(len + 1);
>> + memcpy(entry->compatible, temp, len);
>
> But here you could just use xstrdup?
>
>> +
>> + if (blspec_extra_list == NULL) {
>> + INIT_LIST_HEAD(&entry->list);
>> + blspec_extra_list = &entry->list;
>
> This is unusal. Why not have blspec_extra_list be a list_head instead of a pointer?
>
>> + } else {
>> + list_add_tail(&entry->list, blspec_extra_list);
>> + }
>> +
>> + temp = str + 1;
>> + }
>> + if (*str == 0)
>> + break;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> static int blspec_init(void)
>> {
>> + dev_add_param_string(&global_device, "blspec.compatible.extra",
>> + blspec_extra_set, NULL, &blspec_extra_string, blspec_extra_list);
>> return bootentry_register_provider(blspec_bootentry_provider);
>> }
>> device_initcall(blspec_init);
>> +
>> +BAREBOX_MAGICVAR(global.blspec.compatible.extra, "Extra compatible to also match during bootloader entry matching");
>
--
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