diff options
Diffstat (limited to 'target/linux/generic/patches-4.4/042-0007-mtd-bcm47xxpart-move-TRX-parsing-code-to-separated-f.patch')
| -rw-r--r-- | target/linux/generic/patches-4.4/042-0007-mtd-bcm47xxpart-move-TRX-parsing-code-to-separated-f.patch | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/042-0007-mtd-bcm47xxpart-move-TRX-parsing-code-to-separated-f.patch b/target/linux/generic/patches-4.4/042-0007-mtd-bcm47xxpart-move-TRX-parsing-code-to-separated-f.patch new file mode 100644 index 0000000000..4ef7e7f5d8 --- /dev/null +++ b/target/linux/generic/patches-4.4/042-0007-mtd-bcm47xxpart-move-TRX-parsing-code-to-separated-f.patch @@ -0,0 +1,180 @@ +From b522d7b0ebe3539340c2a6d46d787ae3d33bcb92 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Tue, 10 Jan 2017 23:15:24 +0100 +Subject: [PATCH] mtd: bcm47xxpart: move TRX parsing code to separated function +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This change simplifies main parsing loop logic a bit. In future it may +be useful for moving TRX support to separated module / parser (if we +implement support for them at some point). +Finally parsing TRX at the end puts us in a better position as we have +better flash layout knowledge. It may be useful e.g. if it appears there +is more than 1 TRX partition. + +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +Acked-by: Marek Vasut <marek.vasut@gmail.com> +Signed-off-by: Brian Norris <computersforpeace@gmail.com> +--- + drivers/mtd/bcm47xxpart.c | 121 ++++++++++++++++++++++++++++------------------ + 1 file changed, 74 insertions(+), 47 deletions(-) + +--- a/drivers/mtd/bcm47xxpart.c ++++ b/drivers/mtd/bcm47xxpart.c +@@ -83,6 +83,67 @@ out_default: + return "rootfs"; + } + ++static int bcm47xxpart_parse_trx(struct mtd_info *master, ++ struct mtd_partition *trx, ++ struct mtd_partition *parts, ++ size_t parts_len) ++{ ++ struct trx_header header; ++ size_t bytes_read; ++ int curr_part = 0; ++ int i, err; ++ ++ if (parts_len < 3) { ++ pr_warn("No enough space to add TRX partitions!\n"); ++ return -ENOMEM; ++ } ++ ++ err = mtd_read(master, trx->offset, sizeof(header), &bytes_read, ++ (uint8_t *)&header); ++ if (err && !mtd_is_bitflip(err)) { ++ pr_err("mtd_read error while reading TRX header: %d\n", err); ++ return err; ++ } ++ ++ i = 0; ++ ++ /* We have LZMA loader if offset[2] points to sth */ ++ if (header.offset[2]) { ++ bcm47xxpart_add_part(&parts[curr_part++], "loader", ++ trx->offset + header.offset[i], 0); ++ i++; ++ } ++ ++ if (header.offset[i]) { ++ bcm47xxpart_add_part(&parts[curr_part++], "linux", ++ trx->offset + header.offset[i], 0); ++ i++; ++ } ++ ++ if (header.offset[i]) { ++ size_t offset = trx->offset + header.offset[i]; ++ const char *name = bcm47xxpart_trx_data_part_name(master, ++ offset); ++ ++ bcm47xxpart_add_part(&parts[curr_part++], name, offset, 0); ++ i++; ++ } ++ ++ /* ++ * Assume that every partition ends at the beginning of the one it is ++ * followed by. ++ */ ++ for (i = 0; i < curr_part; i++) { ++ u64 next_part_offset = (i < curr_part - 1) ? ++ parts[i + 1].offset : ++ trx->offset + trx->size; ++ ++ parts[i].size = next_part_offset - parts[i].offset; ++ } ++ ++ return curr_part; ++} ++ + static int bcm47xxpart_parse(struct mtd_info *master, + struct mtd_partition **pparts, + struct mtd_part_parser_data *data) +@@ -93,9 +154,7 @@ static int bcm47xxpart_parse(struct mtd_ + size_t bytes_read; + uint32_t offset; + uint32_t blocksize = master->erasesize; +- struct trx_header *trx; + int trx_part = -1; +- int last_trx_part = -1; + int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, }; + int err; + +@@ -182,54 +241,14 @@ static int bcm47xxpart_parse(struct mtd_ + + /* TRX */ + if (buf[0x000 / 4] == TRX_MAGIC) { +- if (BCM47XXPART_MAX_PARTS - curr_part < 4) { +- pr_warn("Not enough partitions left to register trx, scanning stopped!\n"); +- break; +- } +- +- trx = (struct trx_header *)buf; ++ struct trx_header *trx; + + trx_part = curr_part; + bcm47xxpart_add_part(&parts[curr_part++], "firmware", + offset, 0); + +- i = 0; +- /* We have LZMA loader if offset[2] points to sth */ +- if (trx->offset[2]) { +- bcm47xxpart_add_part(&parts[curr_part++], +- "loader", +- offset + trx->offset[i], +- 0); +- i++; +- } +- +- if (trx->offset[i]) { +- bcm47xxpart_add_part(&parts[curr_part++], +- "linux", +- offset + trx->offset[i], +- 0); +- i++; +- } +- +- /* +- * Pure rootfs size is known and can be calculated as: +- * trx->length - trx->offset[i]. We don't fill it as +- * we want to have jffs2 (overlay) in the same mtd. +- */ +- if (trx->offset[i]) { +- const char *name; +- +- name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]); +- bcm47xxpart_add_part(&parts[curr_part++], +- name, +- offset + trx->offset[i], +- 0); +- i++; +- } +- +- last_trx_part = curr_part - 1; +- + /* Jump to the end of TRX */ ++ trx = (struct trx_header *)buf; + offset = roundup(offset + trx->length, blocksize); + /* Next loop iteration will increase the offset */ + offset -= blocksize; +@@ -307,9 +326,17 @@ static int bcm47xxpart_parse(struct mtd_ + parts[i + 1].offset : master->size; + + parts[i].size = next_part_offset - parts[i].offset; +- if (i == last_trx_part && trx_part >= 0) +- parts[trx_part].size = next_part_offset - +- parts[trx_part].offset; ++ } ++ ++ /* If there was TRX parse it now */ ++ if (trx_part >= 0) { ++ int num_parts; ++ ++ num_parts = bcm47xxpart_parse_trx(master, &parts[trx_part], ++ parts + curr_part, ++ BCM47XXPART_MAX_PARTS - curr_part); ++ if (num_parts > 0) ++ curr_part += num_parts; + } + + *pparts = parts; |