65 lines
1.7 KiB
Diff
65 lines
1.7 KiB
Diff
From: Javier Viguera <javier.viguera@digi.com>
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Date: Thu, 16 Feb 2017 14:53:44 +0100
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Subject: [PATCH 3/4] 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 | 32 ++++++++++++++++++++++++++++++++
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1 file changed, 32 insertions(+)
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diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
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index de2e693e9f93..db1182c7216e 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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@@ -1173,9 +1173,31 @@ 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(const 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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+ char *mmcblk = NULL;
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/* dev_current: fd_current, erase_current */
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fd_current = open (DEVNAME (dev_current), mode);
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@@ -1205,8 +1227,18 @@ 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 if using EMMC (set read-write) */
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+ mmcblk = strstr(DEVNAME(dev_target), "mmcblk");
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+ if (mmcblk)
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+ sysfs_mmcboot_set_protection(mmcblk, 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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+ if (mmcblk)
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+ sysfs_mmcboot_set_protection(mmcblk, 1);
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+
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if (fsync(fd_current) &&
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!(errno == EINVAL || errno == EROFS)) {
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fprintf (stderr,
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