flash/nor/mdr: add docs, remove memory leak on probe()

This adds the mandatory Info documentation for the driver as well as
the usage field.

As a clean up, this also includes freeing of the allocated memory
which results in a memory leak if probe is invoked multiple times.

Valgrind-tested.

Reported by Dmitry Shpak.

Change-Id: I2b1d9b9e8b069c6665b11d880b40ce19a1b26ce6
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2694
Tested-by: jenkins
Reviewed-by: Дмитрий Шпак <disona@yandex.ru>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

2 files changed, 32 insertions, 0 deletions

diff --git a/doc/openocd.texi b/doc/openocd.texi
index 3573d6d8..679d017b 100644
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
@@ -5874,6 +5874,31 @@ flash bank $_FLASHNAME mrvlqspi 0x0 0 0 0 $_TARGETNAME 0x46010000
 
 @end deffn
 
+@deffn {Flash Driver} mdr
+This drivers handles the integrated NOR flash on Milandr Cortex-M
+based controllers. A known limitation is that the Info memory can't be
+read or verified as it's not memory mapped.
+
+@example
+flash bank <name> mdr <base> <size> 0 0 <target#> @var{type} @var{page_count} @var{sec_count}
+@end example
+
+@itemize @bullet
+@item @var{type} - 0 for main memory, 1 for info memory
+@item @var{page_count} - total number of pages
+@item @var{sec_count} - number of sector per page count
+@end itemize
+
+Example usage:
+@example
+if @{ [info exists IMEMORY] && [string equal $IMEMORY true] @} @{
+   flash bank $@{_CHIPNAME@}_info.flash mdr 0x00000000 0x01000 0 0 $_TARGETNAME 1 1 4
+@} else @{
+   flash bank $_CHIPNAME.flash mdr 0x00000000 0x20000 0 0 $_TARGETNAME 0 32 4
+@}
+@end example
+@end deffn
+
 @section mFlash
 
 @subsection mFlash Configuration
diff --git a/src/flash/nor/mdr.c b/src/flash/nor/mdr.c
index ed76aab0..98e013aa 100644
--- a/src/flash/nor/mdr.c
+++ b/src/flash/nor/mdr.c
@@ -482,6 +482,11 @@ static int mdr_probe(struct flash_bank *bank)
 	page_count = mdr_info->page_count;
 	page_size = bank->size / page_count;
 
+	if (bank->sectors) {
+		free(bank->sectors);
+		bank->sectors = NULL;
+	}
+
 	bank->num_sectors = page_count;
 	bank->sectors = malloc(sizeof(struct flash_sector) * page_count);
 
@@ -516,6 +521,8 @@ static int get_mdr_info(struct flash_bank *bank, char *buf, int buf_size)
 
 struct flash_driver mdr_flash = {
 	.name = "mdr",
+	.usage = "flash bank <name> mdr <base> <size> 0 0 <target#> <type> <page_count> <sec_count>\n"
+	"<type>: 0 for main memory, 1 for info memory",
 	.flash_bank_command = mdr_flash_bank_command,
 	.erase = mdr_erase,
 	.protect = mdr_protect,