[PATCH v2 1/2] common: misc: add soc_uid_hex to globalvar

Fabian Pflug
2026-04-15T11:11:02Z

uidstr and uidbuf could be the same, but don't have to be. This results
in uncertainty on what exactly is the current UID used for
machine_set_hashable and to compare against with TLV.

Add an additional global var, that encodes SoC-UID registers in a
manner uniform across SoCs/manufacturers.

This can now be used to feed as data for bound-soc-uid into
`bareboxtlv-generator.py` or as the value for
`CONFIG_HABV4_CSF_UNLOCK_UID`

Signed-off-by: Fabian Pflug <f.pflug@pengutronix.de>
---
common/misc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/common/misc.c b/common/misc.c
index ecf9574f7a..be896706d6 100644
--- a/common/misc.c
+++ b/common/misc.c
@@ -268,6 +268,7 @@ const uuid_t *barebox_get_product_uuid(void)
BAREBOX_MAGICVAR(global.product.uuid, "SMBIOS-reported product UUID");

static char *soc_uid_str;
+static char *soc_uid_bin_str;
static void *soc_uid;
static size_t soc_uid_len;

@@ -295,18 +296,22 @@ void barebox_set_soc_uid(const char *uidstr, const void *uidbuf, size_t len)
soc_uid = xmemdup(uidbuf, len);
soc_uid_len = len;

+ soc_uid_bin_str = xzalloc(len * 2 + 1);
+ bin2hex(soc_uid_bin_str, uidbuf, len);
+
if (uidstr) {
soc_uid_str = xstrdup(uidstr);
} else {
- soc_uid_str = xzalloc(len * 2 + 1);
- bin2hex(soc_uid_str, uidbuf, len);
+ soc_uid_str = soc_uid_bin_str;
}

machine_id_set_hashable(uidbuf, len);

globalvar_add_simple_string("soc_uid", &soc_uid_str);
+ globalvar_add_simple_string("soc_uid_hex", &soc_uid_bin_str);
}
BAREBOX_MAGICVAR(global.soc_uid, "SoC Unique ID");
+BAREBOX_MAGICVAR(global.soc_uid_hex, "SoC Unique ID (in hex)");

const char *barebox_get_soc_uid(void)
{

--
2.47.3