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u-boot: fix patch to unlock emmc boot partitions 

Fix write operation by moving the re-lock of the mmc partition
after performing the system synchronization, if not the mmc
driver throws read-only errors. Also, improved the code
to avoid compilation warnings because the return values were
not managed in write operations.

https://jira.digi.com/browse/DEL-6449

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
This commit is contained in:
Arturo Buzarra 2019-02-15 11:23:10 +01:00
parent 7a358fc25f
commit 47eb2ce646
1 changed files with 42 additions and 17 deletions
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59
meta-digi-arm/recipes-bsp/u-boot/u-boot-fw-utils/0003-fw_env-add-support-to-unlock-emmc-boot-partition.patch
View File

@ -1,38 +1,48 @@
From: Javier Viguera <javier.viguera@digi.com>
Date: Thu, 16 Feb 2017 14:53:44 +0100
Date: Fri, 15 Feb 2019 09:23:50 +0100
Subject: [PATCH 3/4] fw_env: add support to unlock emmc boot partition
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
---
tools/env/fw_env.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
tools/env/fw_env.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index de2e693e9f93..db1182c7216e 100644
index ab06415898..5ebd7d6208 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -1173,9 +1173,31 @@ static int flash_read (int fd)
@@ -1052,13 +1052,42 @@ static int flash_read (int fd)
return -1;
return 0;
}
+/*
+ * Set mmcboot partition read-write protection
+ */
+static int sysfs_mmcboot_set_protection(const char *device, int value)
+{
+ int fd;
+ ssize_t nbytes;
+ 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");
+ perror("sysfs_mmcboot_set_protection: error opening mmcblk");
+ return fd;
+ }
+ snprintf(buf, sizeof(buf), "%s", value ? "1" : "0");
+ write(fd, buf, 2);
+ nbytes = write(fd, buf, 2);
+ close(fd);
+
+ /* Verify bytes written */
+ if (nbytes < 2)
+ {
+ perror("sysfs_mmcboot_set_protection: error writing mmcblk protection");
+ return nbytes >=0 ? -EIO : nbytes;
+ }
+
+ return 0;
+}
+
@ -40,25 +50,40 @@ index de2e693e9f93..db1182c7216e 100644
{
int fd_current, fd_target, rc, dev_target;
+ char *mmcblk = NULL;
/* dev_current: fd_current, erase_current */
fd_current = open (DEVNAME (dev_current), mode);
@@ -1205,8 +1227,18 @@ static int flash_io (int mode)
if (fd_current < 0) {
fprintf (stderr,
@@ -1084,10 +1113,15 @@ static int flash_io (int mode)
} else {
dev_target = dev_current;
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);
if (fsync(fd_current) &&
!(errno == EINVAL || errno == EROFS)) {
fprintf (stderr,
@@ -1109,10 +1143,15 @@ static int flash_io (int mode)
DEVNAME (dev_target),
strerror (errno));
rc = -1;
}
}
+
+ /* Re-enable mmcboot protection (set read-only) */
+ if (mmcblk)
+ sysfs_mmcboot_set_protection(mmcblk, 1);
+
if (fsync(fd_current) &&
!(errno == EINVAL || errno == EROFS)) {
fprintf (stderr,
} else {
rc = flash_read (fd_current);
}
exit: