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112 lines
3.4 KiB
112 lines
3.4 KiB
From 89a0d9a9f1941a086a82bc7cd73d275cec98ba14 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Tue, 10 Jan 2017 23:15:25 +0100
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Subject: [PATCH] mtd: bcm47xxpart: support layouts with multiple TRX
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partitions
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Some devices may have an extra TRX partition used as failsafe one. If
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we detect such partition we should set a proper name for it and don't
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parse it.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Acked-by: Marek Vasut <marek.vasut@gmail.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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---
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drivers/mtd/bcm47xxpart.c | 56 ++++++++++++++++++++++++++++++++++++++---------
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1 file changed, 46 insertions(+), 10 deletions(-)
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--- a/drivers/mtd/bcm47xxpart.c
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+++ b/drivers/mtd/bcm47xxpart.c
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@@ -9,6 +9,7 @@
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*
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*/
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+#include <linux/bcm47xx_nvram.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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@@ -144,6 +145,30 @@ static int bcm47xxpart_parse_trx(struct
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return curr_part;
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}
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+/**
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+ * bcm47xxpart_bootpartition - gets index of TRX partition used by bootloader
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+ *
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+ * Some devices may have more than one TRX partition. In such case one of them
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+ * is the main one and another a failsafe one. Bootloader may fallback to the
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+ * failsafe firmware if it detects corruption of the main image.
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+ *
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+ * This function provides info about currently used TRX partition. It's the one
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+ * containing kernel started by the bootloader.
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+ */
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+static int bcm47xxpart_bootpartition(void)
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+{
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+ char buf[4];
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+ int bootpartition;
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+
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+ /* Check CFE environment variable */
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+ if (bcm47xx_nvram_getenv("bootpartition", buf, sizeof(buf)) > 0) {
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+ if (!kstrtoint(buf, 0, &bootpartition))
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+ return bootpartition;
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+ }
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+
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+ return 0;
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+}
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+
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static int bcm47xxpart_parse(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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@@ -154,7 +179,8 @@ static int bcm47xxpart_parse(struct mtd_
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size_t bytes_read;
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uint32_t offset;
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uint32_t blocksize = master->erasesize;
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- int trx_part = -1;
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+ int trx_parts[2]; /* Array with indexes of TRX partitions */
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+ int trx_num = 0; /* Number of found TRX partitions */
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int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
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int err;
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@@ -243,7 +269,11 @@ static int bcm47xxpart_parse(struct mtd_
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if (buf[0x000 / 4] == TRX_MAGIC) {
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struct trx_header *trx;
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- trx_part = curr_part;
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+ if (trx_num >= ARRAY_SIZE(trx_parts))
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+ pr_warn("No enough space to store another TRX found at 0x%X\n",
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+ offset);
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+ else
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+ trx_parts[trx_num++] = curr_part;
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bcm47xxpart_add_part(&parts[curr_part++], "firmware",
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offset, 0);
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@@ -329,14 +359,20 @@ static int bcm47xxpart_parse(struct mtd_
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}
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/* If there was TRX parse it now */
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- if (trx_part >= 0) {
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- int num_parts;
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+ for (i = 0; i < trx_num; i++) {
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+ struct mtd_partition *trx = &parts[trx_parts[i]];
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- num_parts = bcm47xxpart_parse_trx(master, &parts[trx_part],
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- parts + curr_part,
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- BCM47XXPART_MAX_PARTS - curr_part);
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- if (num_parts > 0)
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- curr_part += num_parts;
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+ if (i == bcm47xxpart_bootpartition()) {
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+ int num_parts;
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+
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+ num_parts = bcm47xxpart_parse_trx(master, trx,
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+ parts + curr_part,
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+ BCM47XXPART_MAX_PARTS - curr_part);
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+ if (num_parts > 0)
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+ curr_part += num_parts;
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+ } else {
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+ trx->name = "failsafe";
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+ }
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}
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*pparts = parts;
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