[U-Boot] [PATCH] fastboot: check for alias when looking up partition by name

Michael Scott
2015-03-11T17:02:31Z

Implement an alias name check for devices where GPT limitations prevent
user-friendly partition names such as "boot", "system" and "cache". Or,
where the actual partition name doesn't match a standard partition name
used commonly with fastboot.

To set an alias, add an environment setting as follows:
fastboot_partition_alias_<alias partition name>=<actual partition name>

Example: fastboot_partition_alias_boot=LNX

Signed-off-by: Michael Scott <michael.scott@linaro.org>
Cc: Steve Rae <srae@broadcom.com>
Cc: Lukasz Majewski <l.majewski@samsung.com>
---
common/fb_mmc.c | 26 ++++++++++++++++++++++++--
doc/README.android-fastboot | 9 +++++++++
2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/common/fb_mmc.c b/common/fb_mmc.c
index 75899e4..0c48cf9 100644
--- a/common/fb_mmc.c
+++ b/common/fb_mmc.c
@@ -33,6 +33,28 @@ void fastboot_okay(const char *s)
strncat(response_str, s, RESPONSE_LEN - 4 - 1);
}

+static int get_partition_info_efi_by_name_or_alias(block_dev_desc_t *dev_desc,
+ const char *name, disk_partition_t *info)
+{
+ int ret;
+
+ ret = get_partition_info_efi_by_name(dev_desc, name, info);
+ if (ret) {
+ /* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
+ char env_alias_name[25 + 32 + 1];
+ char *aliased_part_name;
+
+ /* check for alias */
+ strcpy(env_alias_name, "fastboot_partition_alias_");
+ strncat(env_alias_name, name, 32);
+ aliased_part_name = getenv(env_alias_name);
+ if (aliased_part_name != NULL)
+ ret = get_partition_info_efi_by_name(dev_desc,
+ aliased_part_name, info);
+ }
+ return ret;
+}
+
static void write_raw_image(block_dev_desc_t *dev_desc, disk_partition_t *info,
const char *part_name, void *buffer,
unsigned int download_bytes)
@@ -98,7 +120,7 @@ void fb_mmc_flash_write(const char *cmd, void *download_buffer,
printf("........ success\n");
fastboot_okay("");
return;
- } else if (get_partition_info_efi_by_name(dev_desc, cmd, &info)) {
+ } else if (get_partition_info_efi_by_name_or_alias(dev_desc, cmd, &info)) {
error("cannot find partition: '%s'\n", cmd);
fastboot_fail("cannot find partition");
return;
@@ -136,7 +158,7 @@ void fb_mmc_erase(const char *cmd, char *response)
return;
}

- ret = get_partition_info_efi_by_name(dev_desc, cmd, &info);
+ ret = get_partition_info_efi_by_name_or_alias(dev_desc, cmd, &info);
if (ret) {
error("cannot find partition: '%s'", cmd);
fastboot_fail("cannot find partition");
diff --git a/doc/README.android-fastboot b/doc/README.android-fastboot
index 5526a43..04411e9 100644
--- a/doc/README.android-fastboot
+++ b/doc/README.android-fastboot
@@ -50,6 +50,15 @@ buffer should be as large as possible for a platform. The location of the
buffer and size are set with CONFIG_USB_FASTBOOT_BUF_ADDR and
CONFIG_USB_FASTBOOT_BUF_SIZE.

+Fastboot partition aliases can also be defined for devices where GPT
+limitations prevent user-friendly partition names such as "boot", "system"
+and "cache". Or, where the actual partition name doesn't match a standard
+partition name used commonly with fastboot. Current implentation checks
+aliases when accessing partitions by name (flash_write and erase functions).
+To define a partition alias add an environment variable similar to:
+fastboot_partition_alias_<alias partition name>=<actual partition name>
+Example: fastboot_partition_alias_boot=LNX
+
In Action
=========
Enter into fastboot by executing the fastboot command in u-boot and you
--
2.1.4