[PATCH v8 2/8] configs: add falcon mode fragment for k3 devices

[Anshul Dalal]

This fragment enables falcon boot for K3 platforms and modifies the
memory map.

To have enough stack and heap space for loading kernel image as
FIT the memory map was modified by expanding stack + heap size, the
PRELOADED_BL33_BASE in TFA has to also be updated to 0x82000000 since
the kernel requires to be loaded at 2MiB aligned address along with
updating K3_HW_CONFIG_BASE to 0x88000000 for the DT passed to kernel.

Modified memory map for R5 SPL (modified addresses marked with *):

0x80000000 +-------------------------------+ Start of DDR
  512KiB   |   TFA reserved memory space   | CONFIG_K3_ATF_LOAD_ADDR*
0x80080000 +-------------------------------+
 31.5MiB   |            Unused             |
0x82000000 +-------------------------------+ PRELOADED_BL33_BASE* in TFA
           |                               | CONFIG_SYS_LOAD_ADDR*
   57MiB   |   Kernel + initramfs Image    | CONFIG_SPL_LOAD_FIT_ADDRESS*
           |                               |
0x85900000 +-------------------------------+
           |                               |
           |  R5 U-Boot SPL Stack + Heap   |
   39MiB   |       (size defined by        |
           |SPL_STACK_R_MALLOC_SIMPLE_LEN*)|
           |                               |
0x88000000 +-------------------------------+ CONFIG_SPL_STACK_R_ADDR*
           |                               | K3_HW_CONFIG_BASE* in TFA
   16MiB   |          Kernel DTB           | CONFIG_SPL_PAYLOAD_ARGS_ADDR*
           |                               |
0x89000000 +-------------------------------+
  331MiB   | Device Manager (DM) Load Addr |
0x9db00000 +-------------------------------+
   12MiB   |          DM Reserved          |
0x9e700000 +-------------------------------+
    1MiB   |            Unused             |
0x9e800000 +-------------------------------+ BL32_BASE in TFA
   24MiB   |             OPTEE             |
0xa0000000 +-------------------------------+ End of DDR (512MiB)

Signed-off-by: Anshul Dalal <anshuld at ti.com>
---
 configs/k3_r5_falcon.config | 39 +++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 configs/k3_r5_falcon.config

diff --git a/configs/k3_r5_falcon.config b/configs/k3_r5_falcon.config
new file mode 100644
index 00000000000..9ceda7ce963
--- /dev/null
+++ b/configs/k3_r5_falcon.config
@@ -0,0 +1,39 @@
+# Enable falcon mode
+CONFIG_SPL_OS_BOOT=y
+CONFIG_SPL_OS_BOOT_SECURE=y
+CONFIG_SPL_LOAD_FIT=y
+
+# We use envs for setting bootargs
+CONFIG_SPL_ENV_SUPPORT=y
+
+# Allows for the SPL to detect UUID for kernel's rootfs
+CONFIG_SPL_PARTITION_UUIDS=y
+
+# Perform FDT fixups from SPL
+CONFIG_OF_SYSTEM_SETUP=y
+
+# Disable all non MMC/SD FS boot media to save space
+CONFIG_SPL_SYS_MMCSD_RAW_MODE=n
+CONFIG_SPL_SPI_FLASH_SUPPORT=n
+CONFIG_SPL_YMODEM_SUPPORT=n
+CONFIG_SUPPORT_EMMC_BOOT=n
+CONFIG_SPL_NAND_SUPPORT=n
+CONFIG_SPL_NOR_SUPPORT=n
+CONFIG_SPL_RAM_SUPPORT=n
+
+# Used as the 2MiB aligned load address for kernel
+CONFIG_SYS_LOAD_ADDR=0x82000000
+CONFIG_SPL_STACK_R_ADDR=0x88000000
+CONFIG_SPL_LOAD_FIT_ADDRESS=0x82000000
+CONFIG_SPL_PAYLOAD_ARGS_ADDR=0x88000000
+CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x2700000
+
+# We use the rootfs (i.e partition 2) for booting which is ext4 not FAT
+CONFIG_SYS_MMCSD_FS_BOOT=y
+CONFIG_SYS_MMCSD_FS_BOOT_PARTITION=2
+CONFIG_SPL_FS_EXT4=y
+CONFIG_SPL_FS_FAT=n
+
+# Loading tifalcon instead of tispl which has FDT and A53 SPL saves time
+CONFIG_SPL_FS_LOAD_PAYLOAD_NAME="boot/tifalcon.bin"
+CONFIG_SPL_FS_LOAD_KERNEL_NAME="boot/fitImage"
-- 
2.51.0