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xilinx: zynqmp: Enable stack relocation to DDR

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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@xilinx.com>
This commit is contained in:
Michal Simek 2021-08-24 14:56:47 +02:00
parent 060fa0e11b
commit 229cb5c6ba
1 changed files with 4 additions and 0 deletions
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4
configs/xilinx_zynqmp_virt_defconfig
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@ -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
@ -26,6 +29,7 @@ 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