[U-Boot] [PATCH V2] BOOT: Add RAW ramdisk support to bootz

[Rob Herring]

On 03/16/2012 09:02 AM, Marek Vasut wrote:
> This patch allows loading RAW ramdisk via bootz command. The raw ramdisk is
> loaded only in case it's size is specified:
> 
>   bootz <kernel addr> <ramdisk addr>:<ramdisk size> <fdt addr>
> 
> For example:
> 
>   bootz 0x42000000 0x43000000:0x12345 0x44000000
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Tom Warren <TWarren at nvidia.com>
> Cc: albert.u.boot at aribaud.net
> Cc: afleming at gmail.com,
> Cc: Simon Glass <sjg at chromium.org>,
> Cc: Stephen Warren <swarren at nvidia.com>
> Cc: Nicolas Pitre <nico at fluxnic.net>
> Cc: Wolfgang Denk <wd at denx.de>
> Cc: Detlev Zundel <dzu at denx.de>
> ---
>  README             |    5 +++++
>  common/cmd_bootm.c |    6 ++++--
>  common/image.c     |   31 +++++++++++++++++++++++++++----
>  3 files changed, 36 insertions(+), 6 deletions(-)
> 
> V2: Make this feature configurable
>     Document this feature
> 
> diff --git a/README b/README
> index b273070..43fa160 100644
> --- a/README
> +++ b/README
> @@ -4422,6 +4422,11 @@ On some platforms, it's possible to boot Linux zImage. This is done
>  using the "bootz" command. The syntax of "bootz" command is the same
>  as the syntax of "bootm" command.
>  
> +Note, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
> +kernel with raw initrd images. The syntax is slightly different, the
> +address of the initrd must be augmented by it's size, in the following
> +format: "<initrd addres>:<initrd size>".
> +
>  
>  Standalone HOWTO:
>  =================
> diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
> index 9efac8b..872a49c 100644
> --- a/common/cmd_bootm.c
> +++ b/common/cmd_bootm.c
> @@ -1628,9 +1628,11 @@ static int do_bootz(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  U_BOOT_CMD(
>  	bootz,	CONFIG_SYS_MAXARGS,	1,	do_bootz,
>  	"boot Linux zImage image from memory",
> -	"[addr [initrd] [fdt]]\n    - boot Linux zImage stored in memory\n"
> +	"[addr [initrd[:size]] [fdt]]\n"
> +	"    - boot Linux zImage stored in memory\n"
>  	"\tThe argument 'initrd' is optional and specifies the address\n"
> -	"\tof the initrd in memory.\n"
> +	"\tof the initrd in memory. The optional argument ':size' allows\n"
> +	"\tspecifying the size of RAW initrd.\n"
>  #if defined(CONFIG_OF_LIBFDT)
>  	"\tWhen booting a Linux kernel which requires a flat device-tree\n"
>  	"\ta third argument is required which is the address of the\n"
> diff --git a/common/image.c b/common/image.c
> index 95c7a15..1908df6 100644
> --- a/common/image.c
> +++ b/common/image.c
> @@ -797,6 +797,7 @@ int boot_get_ramdisk(int argc, char * const argv[], bootm_headers_t *images,
>  	ulong rd_addr, rd_load;
>  	ulong rd_data, rd_len;
>  	const image_header_t *rd_hdr;
> +	char *end;
>  #if defined(CONFIG_FIT)
>  	void		*fit_hdr;
>  	const char	*fit_uname_config = NULL;
> @@ -845,10 +846,21 @@ int boot_get_ramdisk(int argc, char * const argv[], bootm_headers_t *images,
>  			} else
>  #endif
>  			{
> -				rd_addr = simple_strtoul(argv[2], NULL, 16);
> +				rd_addr = simple_strtoul(argv[2], &end, 16);

V1 did not work for me and it looks like V2 has the same problem. You'll
never get to this else because of the call to fit_parse_subimage above:

 * fit_parse_subimage() expects subimage spec in the for of
 * [<addr>]:<subimage>, where <addr> is a FIT image address that contains
 * subimage with a <subimg> unit name.


With debug turned on, it thinks my size is the sub-image name:

*  ramdisk: subimage '3DC72E' from image at 0x01000000
   ramdisk start = 0x1ff912fc, ramdisk end = 0x3fe98ab4

Rob

>  				debug("*  ramdisk: cmdline image address = "
>  						"0x%08lx\n",
>  						rd_addr);
> +
> +#ifdef CONFIG_SUPPORT_RAW_INITRD
> +				if (end[0] == ':') {
> +					rd_len = simple_strtoul(++end,
> +								NULL, 16);
> +					debug("*  ramdisk: cmdline image "
> +						"length = 0x%08lx\n",
> +						rd_len);
> +				}
> +#endif
> +
>  			}
>  #if defined(CONFIG_FIT)
>  		} else {
> @@ -990,9 +1002,20 @@ int boot_get_ramdisk(int argc, char * const argv[], bootm_headers_t *images,
>  			break;
>  #endif
>  		default:
> -			puts("Wrong Ramdisk Image Format\n");
> -			rd_data = rd_len = rd_load = 0;
> -			return 1;
> +#ifdef CONFIG_SUPPORT_RAW_INITRD
> +			/*
> +			 * Check if rd_len was manually overridden, if it was,
> +			 * we're loading RAW ramdisk.
> +			 */
> +			if (rd_len != 0) {
> +				rd_data = rd_addr;
> +			} else
> +#endif
> +			{
> +				puts("Wrong Ramdisk Image Format\n");
> +				rd_data = rd_len = rd_load = 0;
> +				return 1;
> +			}
>  		}
>  	} else if (images->legacy_hdr_valid &&
>  			image_check_type(&images->legacy_hdr_os_copy,