[U-Boot] [PATCH 2/2] fastboot: add support for "oem format" command

[Steve Rae <srae@broadcom.com>]

On 15-01-26 01:49 PM, Rob Herring wrote:
> Add "oem format" command to write partition table. This relies on the
> env variable partitions to contain the list of partitions as required by
> the gpt command.
>
> Note that this does not erase any data other than the partition table.
>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
>   drivers/usb/gadget/f_fastboot.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
>
> diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
> index e2fda86..f7d84bf 100644
> --- a/drivers/usb/gadget/f_fastboot.c
> +++ b/drivers/usb/gadget/f_fastboot.c
> @@ -516,6 +516,17 @@ static void cb_flash(struct usb_ep *ep, struct usb_request *req)
>   static void cb_oem(struct usb_ep *ep, struct usb_request *req)
>   {
>   	char *cmd = req->buf;
> +#ifdef CONFIG_FASTBOOT_FLASH
> +	if (strncmp("format", cmd + 4, 6) == 0) {
> +		char cmdbuf[32];
> +                sprintf(cmdbuf, "gpt write mmc %x $partitions",
> +			CONFIG_FASTBOOT_FLASH_MMC_DEV);
> +                if (run_command(cmdbuf, 0))
> +			fastboot_tx_write_str("FAIL");
> +                else
> +			fastboot_tx_write_str("OKAY");
> +	} else
> +#endif
>   	if (strncmp("unlock", cmd + 4, 8) == 0) {
>   		fastboot_tx_write_str("FAILnot implemented");
>   	}
>

Please clarify the "partitions" env variable.
For example, if I have (snippet from the 'mmc part' command):
   3     0x00011000      0x000117ff      "u-boot"
         attrs:  0x0000000000000000
         type:   ebcf4a1c-b9e7-8f06-9885-3bd8b4a46cff
         guid:   d5b495eb-57aa-fc70-23bb-d1897fa4e840
   7     0x0001c000      0x00023fff      "kernel"
         attrs:  0x0000000000000000
         type:   3c3ea4a6-5eaa-7f7c-1cb7-9374b8191c5d
         guid:   43b9c433-a106-68bf-aff4-890416fc87d7
what would the corresponding "partitions" env variable look like?

Thanks, Steve
PS.
from doc/README.gpt:

148 Creating GPT partitions in U-Boot:
149 ==============
150
151 To restore GUID partition table one needs to:
152 1. Define partition layout in the environment.
153    Format of partitions layout:
154      "partitions=uuid_disk=...;name=u-boot,size=60MiB,uuid=...;
155         name=kernel,size=60MiB,uuid=...;"
156      or
157      "partitions=uuid_disk=${uuid_gpt_disk};name=${uboot_name},
158         size=${uboot_size},uuid=${uboot_uuid};"
159
160    Fields 'name', 'size' and 'uuid' are mandatory for every partition.
161    The field 'start' is optional.
162
163    option: CONFIG_RANDOM_UUID
164    If any partition "UUID" no exists then it is randomly generated.
165
166 2. Define 'CONFIG_EFI_PARTITION' and 'CONFIG_CMD_GPT'
167
168 2. From u-boot prompt type:
169    gpt write mmc 0 $partitions

How can dump the current "uuid_disk=" (not in the 'mmc part' command?)
Is the "uuid=" parameter the 'type:' or the 'guid:' in the 'mmc part' 
command?