64 lines
1.6 KiB
Diff
64 lines
1.6 KiB
Diff
From: Javier Viguera <javier.viguera@digi.com>
|
|
Date: Thu, 16 Feb 2017 14:53:44 +0100
|
|
Subject: [PATCH] fw_env: add support to unlock emmc boot partition
|
|
|
|
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
|
|
---
|
|
tools/env/fw_env.c | 31 +++++++++++++++++++++++++++++++
|
|
1 file changed, 31 insertions(+)
|
|
|
|
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
|
|
index 46c619b211b5..1c337b4727a9 100644
|
|
--- a/tools/env/fw_env.c
|
|
+++ b/tools/env/fw_env.c
|
|
@@ -1177,9 +1177,31 @@ static int flash_read (int fd)
|
|
return 0;
|
|
}
|
|
|
|
+/*
|
|
+ * Set mmcboot partition read-write protection
|
|
+ */
|
|
+static int sysfs_mmcboot_set_protection(const char *device, int value)
|
|
+{
|
|
+ int fd;
|
|
+ char buf[64];
|
|
+
|
|
+ snprintf(buf, sizeof(buf), "/sys/block/%s/force_ro", device);
|
|
+ fd = open(buf, O_WRONLY);
|
|
+ if (fd < 0) {
|
|
+ perror("sysfs_mmcboot_set_protection");
|
|
+ return fd;
|
|
+ }
|
|
+ snprintf(buf, sizeof(buf), "%s", value ? "1" : "0");
|
|
+ write(fd, buf, 2);
|
|
+ close(fd);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static int flash_io (int mode)
|
|
{
|
|
int fd_current, fd_target, rc, dev_target;
|
|
+ char *mmcblk = NULL;
|
|
|
|
/* dev_current: fd_current, erase_current */
|
|
fd_current = open (DEVNAME (dev_current), mode);
|
|
@@ -1209,8 +1231,17 @@ static int flash_io (int mode)
|
|
fd_target = fd_current;
|
|
}
|
|
|
|
+ /* Disable mmcboot protection if using EMMC (set read-write) */
|
|
+ mmcblk = strstr(DEVNAME(dev_target), "mmcblk");
|
|
+ if (mmcblk)
|
|
+ sysfs_mmcboot_set_protection(mmcblk, 0);
|
|
+
|
|
rc = flash_write (fd_current, fd_target, dev_target);
|
|
|
|
+ /* Re-enable mmcboot protection (set read-only) */
|
|
+ if (mmcblk)
|
|
+ sysfs_mmcboot_set_protection(mmcblk, 1);
|
|
+
|
|
if (HaveRedundEnv) {
|
|
if (close (fd_target)) {
|
|
fprintf (stderr,
|