Re: [PATCH] mmc-utils: add the way to enable boot-partition

[Giuseppe CAVALLARO <peppe.cavallaro@st.com>]

Hi Chris

On 4/19/2012 7:19 PM, Chris Ball wrote:
> Hi Giuseppe,
> 
> On Thu, Apr 19 2012, Giuseppe CAVALLARO wrote:
>> This adds a new option to enable the boot from eMMC
>> by writing to the 179 ext_csd register.
>>
>> The example below shows as to enable the mmcblk0boot0
>> partition and also set/reset the ACK bit).
>>
>> $ ./mmc booten 1 1 /dev/mmcblk0boot0
>> $ ./mmc extcsd read /dev/mmcblk0boot0 | grep PARTITION_CON
>> Boot configuration bytes [PARTITION_CONFIG: 0x49]
>>
>> Reported-by: Youssef TRIKI <youssef.triki@st.com>
>> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
> 
> Looks good, thanks -- do you mind if I make the following changes for
> readability (and are they correct)?  I can update the commit message too:

your changes are fine for me

thanks a lot

Regards
Peppe

> 
> diff --git a/mmc.c b/mmc.c
> index c295885..6927b70 100644
> --- a/mmc.c
> +++ b/mmc.c
> @@ -66,8 +66,8 @@ static struct Command commands[] = {
>  	  NULL
>  	},
>  	{ do_write_boot_en, -3,
> -	  "booten", "<boot_partition> " "<ack> " "<device>\n"
> -		"Enable the boot partition for the <device>.",
> +	  "bootpart enable", "<boot_partition> " "<send_ack> " "<device>\n"
> +		"Enable the boot partition for the <device>.\nTo receive acknowledgment of boot from the card set <send_ack>\nto 1, else set it to 0.",
>  	  NULL
>  	},
>  	{ 0, 0, 0, 0 }
> diff --git a/mmc_cmds.c b/mmc_cmds.c
> index f588b17..2ab4185 100644
> --- a/mmc_cmds.c
> +++ b/mmc_cmds.c
> @@ -174,13 +174,18 @@ int do_write_boot_en(int nargs, char **argv)
>  	__u8 value = 0;
>  	int fd, ret;
>  	char *device;
> -	int boot_area, ack;
> +	int boot_area, send_ack;
>  
> -	CHECK(nargs != 4, "Usage: mmc booten <partition_number> "
> -			  "<ack> </path/to/mmcblkX>\n", exit(1));
> +	CHECK(nargs != 4, "Usage: mmc bootpart enable <partition_number> "
> +			  "<send_ack> </path/to/mmcblkX>\n", exit(1));
>  
> +	/*
> +	 * If <send_ack> is 1, the device will send acknowledgment
> +	 * pattern "010" to the host when boot operation begins.
> +	 * If <send_ack> is 0, it won't.
> +	 */
>  	boot_area = strtol(argv[1], NULL, 10);
> -	ack = strtol(argv[2], NULL, 10);
> +	send_ack = strtol(argv[2], NULL, 10);
>  	device = argv[3];
>  
>  	fd = open(device, O_RDWR);
> @@ -214,7 +219,7 @@ int do_write_boot_en(int nargs, char **argv)
>  		fprintf(stderr, "Cannot enable the boot area\n");
>  		exit(1);
>  	}
> -	if (ack)
> +	if (send_ack)
>  		value |= EXT_CSD_PART_CONFIG_ACC_ACK;
>  	else
>  		value &= ~EXT_CSD_PART_CONFIG_ACC_ACK;
>