imx: hab: Make imx_hab_is_enabled dependent on FIELD_RETURN
The decision on whether HAB is enabled is solely based on the SEC_CONFIG
fuse. The HAB FIELD_RETURN feature is able to permanently disable HAB on
a CPU, after which it is able to boot unsigned firmware. U-Boot however
does not take into account the FIELD_RETURN mode, and refuses to boot
unsigned software when the feature is enabled.
Also take the FIELD_RETURN fuse into account when deciding whether HAB
is enabled. When The FIELD_RETURN fuse is blown, HAB is not enabled.
Tested on i.MX8M Mini, i.MX8M Plus, i.MX8M Nano and i.MX6ULL
Signed-off-by: Paul Geurts <paul.geurts@prodrive-technologies.com>
diff --git a/arch/arm/mach-imx/mx7/soc.c b/arch/arm/mach-imx/mx7/soc.c
index 11e8ac0..e504c1f 100644
--- a/arch/arm/mach-imx/mx7/soc.c
+++ b/arch/arm/mach-imx/mx7/soc.c
@@ -131,6 +131,11 @@
.bank = 1,
.word = 3,
};
+
+struct imx_fuse const imx_field_return_fuse = {
+ .bank = 8,
+ .word = 3,
+};
#endif
static bool is_mx7d(void)