board/BuR/brppt1: implement more flexible boot process

With this commit we do:

- set the bootdelay in all brppt1 defconfigs to 0, this makes
development easier, since we can break into serial console.

- move CONFIG_BOOTCOMMAND from header file to defconfig

- introduce b_mode variable for selecting the final boot-target.
This b_mode represents the boot-switch, which can found on most b&r
targets. On the brppt1 this boot-switch is derived from some gpio and
the bootcounter within the RTC block, making it so possible to force
a boot-target (as example for repair-case).

- refactor the environment for booting new flexible way
primary we want to get some bootscr.img within the mass-storage,
this script then loads everything needed for the boot.
For legacy reason we implement the t30lgcy#x boot targets, booting the
already delivered linux-images.

- make space for the cfgscr within mtdparts on brppt1_nand

Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>

configs/brppt1_mmc_defconfig

@@ -10,7 +10,9 @@ CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1,EMMC_BOOT"
-CONFIG_BOOTDELAY=-2
+CONFIG_BOOTDELAY=0
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_BOOTCOMMAND="run b_default"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
 CONFIG_SYS_CONSOLE_INFO_QUIET=y

configs/brppt1_nand_defconfig

@@ -9,7 +9,9 @@ CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1"
-CONFIG_BOOTDELAY=-2
+CONFIG_BOOTDELAY=0
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_BOOTCOMMAND="run b_default"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
@@ -46,7 +48,7 @@ CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nand0=omap2-nand.0"
-CONFIG_MTDPARTS_DEFAULT="mtdparts=omap2-nand.0:128k(MLO),128k(MLO.backup),128k(dtb),128k(u-boot-env),512k(u-boot),4m(kernel),128m(rootfs),-(user)"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=omap2-nand.0:128k(MLO),128k(cfgscr),128k(dtb),128k(u-boot-env),512k(u-boot),4m(kernel),128m(rootfs),-(user)"
 CONFIG_ENV_IS_IN_NAND=y
 CONFIG_NETCONSOLE=y
 CONFIG_BOOTCOUNT_LIMIT=y

configs/brppt1_spi_defconfig

@@ -13,7 +13,9 @@ CONFIG_SPL_SPI_SUPPORT=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1,SPI_BOOT,EMMC_BOOT"
 CONFIG_SPI_BOOT=y
-CONFIG_BOOTDELAY=-2
+CONFIG_BOOTDELAY=0
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_BOOTCOMMAND="run b_default"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
 CONFIG_SYS_CONSOLE_INFO_QUIET=y