--- a/drivers/mtd/ofpart.c +++ b/drivers/mtd/ofpart.c @@ -25,6 +25,38 @@ static bool node_has_compatible(struct d return of_get_property(pp, "compatible", NULL); } +static uint8_t * brnboot_get_selected_root_part(struct mtd_info *master, + loff_t offset) +{ + static uint8_t root_id; + int err, len; + + err = mtd_read(master, offset, 0x01, &len, &root_id); + + if (mtd_is_bitflip(err) || !err) + return &root_id; + + return NULL; +} + +static void brnboot_set_active_root_part(struct mtd_partition *pparts, + struct device_node **part_nodes, + int nr_parts, + uint8_t *root_id) +{ + int i; + + for (i = 0; i < nr_parts; i++) { + int part_root_id; + + if (!of_property_read_u32(part_nodes[i], "brnboot,root-id", &part_root_id) + && part_root_id == *root_id) { + pparts[i].name = "firmware"; + break; + } + } +} + static int parse_ofpart_partitions(struct mtd_info *master, struct mtd_partition **pparts, struct mtd_part_parser_data *data) @@ -35,7 +67,8 @@ static int parse_ofpart_partitions(struc struct device_node *pp; int nr_parts, i, ret = 0; bool dedicated = true; - + uint8_t *proot_id = NULL; + struct device_node **part_nodes; if (!data) return 0; @@ -73,7 +106,9 @@ static int parse_ofpart_partitions(struc return 0; *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL); - if (!*pparts) + part_nodes = kzalloc(nr_parts * sizeof(*part_nodes), GFP_KERNEL); + + if (!*pparts || !part_nodes) return -ENOMEM; i = 0; @@ -121,12 +156,22 @@ static int parse_ofpart_partitions(struc if (of_get_property(pp, "lock", &len)) (*pparts)[i].mask_flags |= MTD_POWERUP_LOCK; + if (!proot_id && of_device_is_compatible(pp, "brnboot,root-selector")) + proot_id = brnboot_get_selected_root_part(master, (*pparts)[i].offset); + + part_nodes[i] = pp; + i++; } if (!nr_parts) goto ofpart_none; + if (proot_id) + brnboot_set_active_root_part(*pparts, part_nodes, nr_parts, proot_id); + + kfree(part_nodes); + return nr_parts; ofpart_fail: @@ -136,6 +181,7 @@ ofpart_fail: ofpart_none: of_node_put(pp); kfree(*pparts); + kfree(part_nodes); *pparts = NULL; return ret; }