[PATCH] xilinx: zynqmp: Enable stack relocation to DDR

[Michal Simek]

There is no space in OCM for SPL stack because the space in OCM is occupied
by TF-A. That's why move relocate stack to DDR to 0x18000000 address
and also enable SPL_SIZE_LIMIT not to be more then 0xfffea000 which is
default address for TFA.

It is good to summarize current DDR usage in SPL flow.
0-0x80000 is used for BSS
 (CONFIG_SPL_BSS_START_ADDR, CONFIG_SPL_BSS_MAX_SIZE)
0x100000 is used for DTB passing address
 (CONFIG_XILINX_OF_BOARD_DTB_ADDR)
0x17fffe70 - CONFIG_SPL_STACK_R_ADDR - is used for GD
0x18000000 is used for SPL stack
 (CONFIG_SPL_STACK_R_ADDR)
0x20000000-0x21000000 is used for SPL malloc area
 (CONFIG_SYS_SPL_MALLOC_START, CONFIG_SYS_SPL_MALLOC_SIZE)

Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

 configs/xilinx_zynqmp_virt_defconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configs/xilinx_zynqmp_virt_defconfig b/configs/xilinx_zynqmp_virt_defconfig
index 8d82fe918a60..00f7133d775a 100644
--- a/configs/xilinx_zynqmp_virt_defconfig
+++ b/configs/xilinx_zynqmp_virt_defconfig
@@ -8,6 +8,9 @@ CONFIG_SYS_MEMTEST_END=0x00001000
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x100000
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="zynqmp-zcu100-revC"
+CONFIG_SPL_STACK_R_ADDR=0x18000000
+CONFIG_SPL_SIZE_LIMIT=0x2a000
+CONFIG_SPL_SIZE_LIMIT_PROVIDE_STACK=0x0
 CONFIG_SPL=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI_SUPPORT=y
@@ -28,6 +31,7 @@ CONFIG_USE_PREBOOT=y
 CONFIG_PREBOOT="run scsi_init;usb start"
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_BOARD_EARLY_INIT_R=y
+CONFIG_SPL_STACK_R=y
 CONFIG_SPL_FPGA=y
 CONFIG_SPL_OS_BOOT=y
 CONFIG_SPL_RAM_SUPPORT=y
-- 
2.33.0