edd7ffcb88
brnboot based devices can have two Image partitions. When flashing images via the brnboot recovery web interface, the Image partitions are written alternating. The current active Image partition is stored in the first byte of the Primary_Setting partition by using 0x00 for Code_Image_0 and 0x01 for Code_Image_1. By using the information about the active "Code Image", it is possible to ensure that the rootfs belongs to the current booted Image/Kernel. Signed-off-by: Mathias Kresin <openwrt@kresin.me> SVN-Revision: 49281
94 lines
2.1 KiB
Diff
94 lines
2.1 KiB
Diff
--- a/drivers/mtd/ofpart.c
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+++ b/drivers/mtd/ofpart.c
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@@ -25,6 +25,38 @@ static bool node_has_compatible(struct d
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return of_get_property(pp, "compatible", NULL);
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}
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+static uint8_t * brnboot_get_selected_root_part(struct mtd_info *master,
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+ loff_t offset)
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+{
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+ static uint8_t root_id;
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+ int err, len;
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+
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+ err = mtd_read(master, offset, 0x01, &len, &root_id);
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+
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+ if (mtd_is_bitflip(err) || !err)
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+ return &root_id;
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+
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+ return NULL;
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+}
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+
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+static void brnboot_set_active_root_part(struct mtd_partition *pparts,
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+ struct device_node **part_nodes,
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+ int nr_parts,
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+ uint8_t *root_id)
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+{
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+ int i;
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+
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+ for (i = 0; i < nr_parts; i++) {
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+ int part_root_id;
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+
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+ if (!of_property_read_u32(part_nodes[i], "brnboot,root-id", &part_root_id)
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+ && part_root_id == *root_id) {
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+ pparts[i].name = "firmware";
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+ break;
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+ }
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+ }
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+}
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+
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static int parse_ofpart_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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@@ -35,7 +67,8 @@ static int parse_ofpart_partitions(struc
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struct device_node *pp;
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int nr_parts, i, ret = 0;
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bool dedicated = true;
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-
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+ uint8_t *proot_id = NULL;
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+ struct device_node **part_nodes;
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if (!data)
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return 0;
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@@ -73,7 +106,9 @@ static int parse_ofpart_partitions(struc
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return 0;
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*pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
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- if (!*pparts)
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+ part_nodes = kzalloc(nr_parts * sizeof(*part_nodes), GFP_KERNEL);
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+
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+ if (!*pparts || !part_nodes)
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return -ENOMEM;
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i = 0;
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@@ -121,12 +156,22 @@ static int parse_ofpart_partitions(struc
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if (of_get_property(pp, "lock", &len))
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(*pparts)[i].mask_flags |= MTD_POWERUP_LOCK;
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+ if (!proot_id && of_device_is_compatible(pp, "brnboot,root-selector"))
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+ proot_id = brnboot_get_selected_root_part(master, (*pparts)[i].offset);
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+
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+ part_nodes[i] = pp;
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+
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i++;
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}
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if (!nr_parts)
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goto ofpart_none;
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+ if (proot_id)
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+ brnboot_set_active_root_part(*pparts, part_nodes, nr_parts, proot_id);
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+
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+ kfree(part_nodes);
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+
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return nr_parts;
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ofpart_fail:
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@@ -136,6 +181,7 @@ ofpart_fail:
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ofpart_none:
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of_node_put(pp);
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kfree(*pparts);
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+ kfree(part_nodes);
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*pparts = NULL;
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return ret;
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}
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