[PATCH] xilinx: versal: Enable CONFIG_POSITION_INDEPENDENT
From: T Karthik Reddy t.karthik.reddy@xilinx.com
U-Boot expects to be linked to a specific hard-coded address and to be loaded to and run from that address. CONFIG_POSITION_INDEPENDENT config lifts that restriction & allowing the code to be loaded to and executed from almost any address.
As we enabled CONFIG_POSITION_INDEPENDENT, CONFIG_INIT_SP_RELATIVE is enabled by default, where it will set the early stack pointer at runtime by adding an offset value to &_bss_start. The offset value is taken from SYS_INIT_SP_BSS_OFFSET.
SYS_INIT_SP_BSS_OFFSET offset should be large enough so that the early malloc region, global data (gd), and early stack should fit. With commit d8fabcc424bd ("arm64: versal: Increase SYS_MALLOC_F_LEN") SYS_MALLOC_F_LEN is increased from 32KB to 1MB, so we need to accommodate this space with SYS_INIT_SP_BSS_OFFSET. Hence increasing SYS_INIT_SP_BSS_OFFSET to 1.5MB.
Signed-off-by: T Karthik Reddy t.karthik.reddy@xilinx.com Acked-by: Ashok Reddy Soma ashok.reddy.soma@xilinx.com Signed-off-by: Michal Simek michal.simek@xilinx.com ---
configs/xilinx_versal_virt_defconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/configs/xilinx_versal_virt_defconfig b/configs/xilinx_versal_virt_defconfig index 707693713a7e..f4e9a80728d7 100644 --- a/configs/xilinx_versal_virt_defconfig +++ b/configs/xilinx_versal_virt_defconfig @@ -1,5 +1,6 @@ CONFIG_ARM=y CONFIG_POSITION_INDEPENDENT=y +CONFIG_SYS_INIT_SP_BSS_OFFSET=1572864 CONFIG_ARCH_VERSAL=y CONFIG_SYS_TEXT_BASE=0x8000000 CONFIG_SYS_MALLOC_F_LEN=0x100000
st 12. 5. 2021 v 14:35 odesÃlatel Michal Simek michal.simek@xilinx.com napsal:
From: T Karthik Reddy t.karthik.reddy@xilinx.com
U-Boot expects to be linked to a specific hard-coded address and to be loaded to and run from that address. CONFIG_POSITION_INDEPENDENT config lifts that restriction & allowing the code to be loaded to and executed from almost any address.
As we enabled CONFIG_POSITION_INDEPENDENT, CONFIG_INIT_SP_RELATIVE is enabled by default, where it will set the early stack pointer at runtime by adding an offset value to &_bss_start. The offset value is taken from SYS_INIT_SP_BSS_OFFSET.
SYS_INIT_SP_BSS_OFFSET offset should be large enough so that the early malloc region, global data (gd), and early stack should fit. With commit d8fabcc424bd ("arm64: versal: Increase SYS_MALLOC_F_LEN") SYS_MALLOC_F_LEN is increased from 32KB to 1MB, so we need to accommodate this space with SYS_INIT_SP_BSS_OFFSET. Hence increasing SYS_INIT_SP_BSS_OFFSET to 1.5MB.
Signed-off-by: T Karthik Reddy t.karthik.reddy@xilinx.com Acked-by: Ashok Reddy Soma ashok.reddy.soma@xilinx.com Signed-off-by: Michal Simek michal.simek@xilinx.com
configs/xilinx_versal_virt_defconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/configs/xilinx_versal_virt_defconfig b/configs/xilinx_versal_virt_defconfig index 707693713a7e..f4e9a80728d7 100644 --- a/configs/xilinx_versal_virt_defconfig +++ b/configs/xilinx_versal_virt_defconfig @@ -1,5 +1,6 @@ CONFIG_ARM=y CONFIG_POSITION_INDEPENDENT=y +CONFIG_SYS_INIT_SP_BSS_OFFSET=1572864 CONFIG_ARCH_VERSAL=y CONFIG_SYS_TEXT_BASE=0x8000000 CONFIG_SYS_MALLOC_F_LEN=0x100000 -- 2.31.1
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