--- 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_fixed_partitions(struct mtd_info *master, const struct mtd_partition **pparts, struct mtd_part_parser_data *data) @@ -36,7 +68,8 @@ static int parse_fixed_partitions(struct struct device_node *pp; int nr_parts, i, ret = 0; bool dedicated = true; - + uint8_t *proot_id = NULL; + struct device_node **part_nodes; /* Pull of_node from the master device node */ mtd_node = mtd_get_of_node(master); @@ -72,7 +105,9 @@ static int parse_fixed_partitions(struct return 0; parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL); - if (!parts) + part_nodes = kcalloc(nr_parts, sizeof(*part_nodes), GFP_KERNEL); + + if (!parts || !part_nodes) return -ENOMEM; i = 0; @@ -121,12 +156,22 @@ static int parse_fixed_partitions(struct if (of_get_property(pp, "lock", &len)) parts[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, parts[i].offset); + + part_nodes[i] = pp; + i++; } if (!nr_parts) goto ofpart_none; + if (proot_id) + brnboot_set_active_root_part(parts, part_nodes, nr_parts, proot_id); + + kfree(part_nodes); + *pparts = parts; return nr_parts; @@ -137,6 +182,7 @@ ofpart_fail: ofpart_none: of_node_put(pp); kfree(parts); + kfree(part_nodes); return ret; }