board: siemens: iot2050: Split the build for PG1 and PG2

Due to different signature keys, the PG1 and the PG2 boards can no
longer use the same FSBL (tiboot3). This makes it impossible anyway to
maintaine a single flash.bin for both variants, so we can also split the
build.

A new target is added to indicates the build is for PG1 vs. PG2 boards.
Hence now the variants have separated defconfig files.

The runtime board_is_sr1() check does make no sense anymore, so remove
it and replace with build time check.

Documentation is updated accordingly. New binary artifacts are already
available via meta-iot2050.

Signed-off-by: Su Baocheng <baocheng.su@siemens.com>
[Jan: refactor config option into targets, tweak some wordings]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
diff --git a/configs/iot2050_defconfig b/configs/iot2050_pg1_defconfig
similarity index 98%
rename from configs/iot2050_defconfig
rename to configs/iot2050_pg1_defconfig
index 57387ed..0440cf1 100644
--- a/configs/iot2050_defconfig
+++ b/configs/iot2050_pg1_defconfig
@@ -8,7 +8,7 @@
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_SOC_K3_AM654=y
-CONFIG_TARGET_IOT2050_A53=y
+CONFIG_TARGET_IOT2050_A53_PG1=y
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x80100000
 CONFIG_ENV_SIZE=0x20000
diff --git a/configs/iot2050_defconfig b/configs/iot2050_pg2_defconfig
similarity index 93%
copy from configs/iot2050_defconfig
copy to configs/iot2050_pg2_defconfig
index 57387ed..58aefac 100644
--- a/configs/iot2050_defconfig
+++ b/configs/iot2050_pg2_defconfig
@@ -8,7 +8,7 @@
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_SOC_K3_AM654=y
-CONFIG_TARGET_IOT2050_A53=y
+CONFIG_TARGET_IOT2050_A53_PG2=y
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x80100000
 CONFIG_ENV_SIZE=0x20000
@@ -16,19 +16,21 @@
 CONFIG_ENV_SECT_SIZE=0x20000
 CONFIG_DM_GPIO=y
 CONFIG_SPL_DM_SPI=y
-CONFIG_DEFAULT_DEVICE_TREE="k3-am6528-iot2050-basic"
+CONFIG_DEFAULT_DEVICE_TREE="k3-am6528-iot2050-basic-pg2"
 CONFIG_SPL_TEXT_BASE=0x80080000
 CONFIG_SYS_PROMPT="IOT2050> "
-CONFIG_DM_RESET=y
 CONFIG_SPL_SERIAL=y
 CONFIG_SPL_STACK_R_ADDR=0x82000000
 CONFIG_ENV_OFFSET_REDUND=0x6a0000
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI=y
+CONFIG_DISTRO_DEFAULTS=y
+CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
+CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x80100000
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_SPL_LOAD_FIT=y
+# CONFIG_USE_SPL_FIT_GENERATOR is not set
 CONFIG_OF_BOARD_SETUP=y
-CONFIG_DISTRO_DEFAULTS=y
 CONFIG_BOOTSTAGE=y
 CONFIG_SHOW_BOOT_PROGRESS=y
 CONFIG_SPL_SHOW_BOOT_PROGRESS=y
@@ -74,6 +76,7 @@
 CONFIG_SPL_MULTI_DTB_FIT_NO_COMPRESSION=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
+CONFIG_DM=y
 CONFIG_SPL_DM=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
 CONFIG_SPL_REGMAP=y
@@ -120,6 +123,7 @@
 CONFIG_POWER_DOMAIN=y
 CONFIG_TI_SCI_POWER_DOMAIN=y
 CONFIG_REMOTEPROC_TI_K3_R5F=y
+CONFIG_DM_RESET=y
 CONFIG_RESET_TI_SCI=y
 CONFIG_DM_SERIAL=y
 CONFIG_SOC_DEVICE=y