From 89a0d9a9f1941a086a82bc7cd73d275cec98ba14 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Tue, 10 Jan 2017 23:15:25 +0100 Subject: [PATCH] mtd: bcm47xxpart: support layouts with multiple TRX partitions MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Some devices may have an extra TRX partition used as failsafe one. If we detect such partition we should set a proper name for it and don't parse it. Signed-off-by: Rafał Miłecki Acked-by: Marek Vasut Signed-off-by: Brian Norris --- drivers/mtd/bcm47xxpart.c | 56 ++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 46 insertions(+), 10 deletions(-) --- a/drivers/mtd/bcm47xxpart.c +++ b/drivers/mtd/bcm47xxpart.c @@ -9,6 +9,7 @@ * */ +#include #include #include #include @@ -144,6 +145,30 @@ static int bcm47xxpart_parse_trx(struct return curr_part; } +/** + * bcm47xxpart_bootpartition - gets index of TRX partition used by bootloader + * + * Some devices may have more than one TRX partition. In such case one of them + * is the main one and another a failsafe one. Bootloader may fallback to the + * failsafe firmware if it detects corruption of the main image. + * + * This function provides info about currently used TRX partition. It's the one + * containing kernel started by the bootloader. + */ +static int bcm47xxpart_bootpartition(void) +{ + char buf[4]; + int bootpartition; + + /* Check CFE environment variable */ + if (bcm47xx_nvram_getenv("bootpartition", buf, sizeof(buf)) > 0) { + if (!kstrtoint(buf, 0, &bootpartition)) + return bootpartition; + } + + return 0; +} + static int bcm47xxpart_parse(struct mtd_info *master, const struct mtd_partition **pparts, struct mtd_part_parser_data *data) @@ -154,7 +179,8 @@ static int bcm47xxpart_parse(struct mtd_ size_t bytes_read; uint32_t offset; uint32_t blocksize = master->erasesize; - int trx_part = -1; + int trx_parts[2]; /* Array with indexes of TRX partitions */ + int trx_num = 0; /* Number of found TRX partitions */ int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, }; int err; @@ -243,7 +269,11 @@ static int bcm47xxpart_parse(struct mtd_ if (buf[0x000 / 4] == TRX_MAGIC) { struct trx_header *trx; - trx_part = curr_part; + if (trx_num >= ARRAY_SIZE(trx_parts)) + pr_warn("No enough space to store another TRX found at 0x%X\n", + offset); + else + trx_parts[trx_num++] = curr_part; bcm47xxpart_add_part(&parts[curr_part++], "firmware", offset, 0); @@ -329,14 +359,20 @@ static int bcm47xxpart_parse(struct mtd_ } /* If there was TRX parse it now */ - if (trx_part >= 0) { - int num_parts; + for (i = 0; i < trx_num; i++) { + struct mtd_partition *trx = &parts[trx_parts[i]]; - 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; + if (i == bcm47xxpart_bootpartition()) { + int num_parts; + + num_parts = bcm47xxpart_parse_trx(master, trx, + parts + curr_part, + BCM47XXPART_MAX_PARTS - curr_part); + if (num_parts > 0) + curr_part += num_parts; + } else { + trx->name = "failsafe"; + } } *pparts = parts;