63 lines
1.6 KiB
Diff
63 lines
1.6 KiB
Diff
From: Javier Viguera <javier.viguera@digi.com>
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Date: Tue, 1 Apr 2014 18:43:07 +0200
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Subject: [PATCH] fw_env: add support to unlock emmc boot partition
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Signed-off-by: Javier Viguera <javier.viguera@digi.com>
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---
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tools/env/fw_env.c | 33 +++++++++++++++++++++++++++++++++
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1 file changed, 33 insertions(+)
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diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
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index 09f06c874b17..ae6c69eca0ad 100644
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--- a/tools/env/fw_env.c
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+++ b/tools/env/fw_env.c
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@@ -1218,6 +1218,27 @@ static int flash_read (int fd)
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return 0;
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}
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+/*
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+ * Set mmcboot partition read-write protection
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+ */
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+static int sysfs_mmcboot_set_protection(char *device, int value)
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+{
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+ int fd;
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+ char buf[64];
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+
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+ snprintf(buf, sizeof(buf), "/sys/block/%s/force_ro", device);
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+ fd = open(buf, O_WRONLY);
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+ if (fd < 0) {
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+ perror("sysfs_mmcboot_set_protection");
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+ return fd;
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+ }
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+ snprintf(buf, sizeof(buf), "%s", value ? "1" : "0");
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+ write(fd, buf, 2);
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+ close(fd);
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+
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+ return 0;
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+}
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+
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static int flash_io (int mode)
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{
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int fd_current, fd_target, rc, dev_target;
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@@ -1250,8 +1271,20 @@ static int flash_io (int mode)
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fd_target = fd_current;
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}
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+ /*
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+ * Disable mmcboot protection (set read-write)
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+ *
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+ * In a CCIMX6 dev_current and dev_target is the same device so it's ok to
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+ * just use dev_current here.
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+ *
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+ */
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+ sysfs_mmcboot_set_protection(DEVNAME(dev_current) + 5 /* /dev/ */ , 0);
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+
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rc = flash_write (fd_current, fd_target, dev_target);
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+ /* Re-enable mmcboot protection (set read-only) */
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+ sysfs_mmcboot_set_protection(DEVNAME(dev_current) + 5 /* /dev/ */ , 1);
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+
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if (HaveRedundEnv) {
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if (close (fd_target)) {
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fprintf (stderr,
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