board: ti: am62x_evm: Add android bootflow

Add Android bootflow support for AM62X SK EVM board with
new android boot method.

To build for AM62x for Android, we use the
am62x_a53_android.config fragment when building A53 bootloaders:

  $ make am62x_evm_a53_defconfig
  $ make am62x_a53_android.config
  $ make

Co-developed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>

board/ti/am62x/am62x.env

@@ -19,3 +19,8 @@ splashfile=ti_logo_414x97_32bpp.bmp.gz
 splashimage=0x80200000
 splashpos=m,m
 splashsource=sf
+
+#if CONFIG_BOOTMETH_ANDROID
+#include <env/ti/android.env>
+adtb_idx=0
+#endif

configs/am62x_a53_android.config

@@ -0,0 +1,21 @@
+# Defconfig fragment for enabling Android boot flow
+# to apply on top of am62x_evm_a53_defconfig or am62x_lpsk_a53_defconfig
+# Enable fastboot
+CONFIG_USB_FUNCTION_FASTBOOT=y
+CONFIG_FASTBOOT_BUF_ADDR=0xC0000000
+CONFIG_FASTBOOT_BUF_SIZE=0x2F000000
+CONFIG_FASTBOOT_FLASH=y
+CONFIG_FASTBOOT_FLASH_MMC_DEV=0
+CONFIG_CMD_GPT=y # Needed for FASTBOOT_CMD_OEM_FORMAT
+CONFIG_RANDOM_UUID=y # Needed for FASTBOOT_CMD_OEM_FORMAT
+CONFIG_FASTBOOT_CMD_OEM_FORMAT=y
+# Enable Android boot flow
+CONFIG_BOOTMETH_ANDROID=y
+CONFIG_SYS_BOOTM_LEN=0x4000000
+CONFIG_SYS_MALLOC_LEN=0x08000000
+CONFIG_AVB_VERIFY=y
+CONFIG_LIBAVB=y
+CONFIG_CMD_ADTIMG=y
+CONFIG_CMD_ABOOTIMG=y
+CONFIG_CMD_AB_SELECT=y
+CONFIG_CMD_AVB=y

doc/board/ti/am62x_sk.rst

@@ -132,6 +132,20 @@ DFU support (and disable storage support)
 .. include::  ../ti/k3.rst
     :start-after: .. k3_rst_include_start_build_steps_uboot
     :end-before: .. k3_rst_include_end_build_steps_uboot
+
+* 3.2.1 Alternative build of A53 for Android bootflow:
+
+Since the Android requires many more dependencies, it is disabled by default.
+An extra config fragment should be used to enable Android bootflow support.
+
+.. prompt:: bash $
+
+  export UBOOT_CFG_CORTEXR="${UBOOT_CFG_CORTEXA} am62x_a53_android.config"
+
+.. include::  ../ti/k3.rst
+    :start-after: .. k3_rst_include_start_build_steps_uboot
+    :end-before: .. k3_rst_include_end_build_steps_uboot
+
 .. am62x_evm_rst_include_end_build_steps
 
 Target Images

include/env/ti/android.env

@@ -0,0 +1,31 @@
+/* Android partitions
+ * += is needed because \n is converted by space in .env files */
+partitions=name=bootloader,start=5M,size=8M,uuid=${uuid_gpt_bootloader};
+partitions+=name=tiboot3,start=4M,size=1M,uuid=${uuid_gpt_tiboot3};
+partitions+=name=misc,start=13824K,size=512K,uuid=${uuid_gpt_misc};
+partitions+=name=frp,size=512K,uuid=${uuid_gpt_frp};
+partitions+=name=boot_a,size=40M,uuid=${uuid_gpt_boot_a};
+partitions+=name=boot_b,size=40M,uuid=${uuid_gpt_boot_b};
+partitions+=name=vendor_boot_a,size=32M,uuid=${uuid_gpt_vendor_boot_a};
+partitions+=name=vendor_boot_b,size=32M,uuid=${uuid_gpt_vendor_boot_b};
+partitions+=name=init_boot_a,size=8M,uuid=${uuid_gpt_init_boot_a};
+partitions+=name=init_boot_b,size=8M,uuid=${uuid_gpt_init_boot_b};
+partitions+=name=dtbo_a,size=8M,uuid=${uuid_gpt_dtbo_a};
+partitions+=name=dtbo_b,size=8M,uuid=${uuid_gpt_dtbo_b};
+partitions+=name=vbmeta_a,size=64K,uuid=${uuid_gpt_vbmeta_a};
+partitions+=name=vbmeta_b,size=64K,uuid=${uuid_gpt_vbmeta_b};
+partitions+=name=vbmeta_vendor_dlkm_a,size=64K,uuid=${uuid_gpt_vbmeta_vendor_dlkm_a};
+partitions+=name=vbmeta_vendor_dlkm_b,size=64K,uuid=${uuid_gpt_vbmeta_vendor_dlkm_b};
+partitions+=name=super,size=4608M,uuid=${uuid_gpt_super};
+partitions+=name=metadata,size=64M,uuid=${uuid_gpt_metadata};
+partitions+=name=persist,size=32M,uuid=${uuid_gpt_persist};
+partitions+=name=userdata,size=-,uuid=${uuid_gpt_userdata}
+
+fastboot_raw_partition_bootenv=0x800 0x400 mmcpart 1
+fastboot.partition-type:metadata=f2fs
+
+boot_targets=mmc0
+mmcdev=0
+bootmeths=android
+vendor_boot_comp_addr_r=0xd0000000
+bootcmd=bootflow scan -lb