Similar change was done in past by commit 3b644a3c2f69
("arm64: zynqmp: Provide a config to not map DDR region in MMU table").
Signed-off-by: Michal Simek <michal.si...@xilinx.com>
---
arch/arm/mach-versal/Kconfig | 6 ++++++
arch/arm/mach-versal/cpu.c | 9 +++++++++
2 files changed, 15 insertions(+)
diff --git a/arch/arm/mach-versal/Kconfig b/arch/arm/mach-versal/Kconfig
index a08e5ae41490..e1d66e8d32b7 100644
--- a/arch/arm/mach-versal/Kconfig
+++ b/arch/arm/mach-versal/Kconfig
@@ -56,4 +56,10 @@ config DEFINE_TCM_OCM_MMAP
This option if enabled defines the TCM and OCM memory and its
memory attributes in MMU table entry.
+config VERSAL_NO_DDR
+ bool "Disable DDR MMU mapping"
+ help
+ This option configures MMU with no DDR to avoid speculative
+ access to DDR memory where DDR is not present.
+
endif
diff --git a/arch/arm/mach-versal/cpu.c b/arch/arm/mach-versal/cpu.c
index 6ee6cd43eca4..829a6c1b3e53 100644
--- a/arch/arm/mach-versal/cpu.c
+++ b/arch/arm/mach-versal/cpu.c
@@ -81,6 +81,15 @@ void mem_map_fill(void)
if (!gd->bd->bi_dram[i].size)
break;
+#if defined(CONFIG_VERSAL_NO_DDR)
+ if (gd->bd->bi_dram[i].start < 0x80000000UL ||
+ gd->bd->bi_dram[i].start > 0x100000000UL) {
+ printf("Ignore caches over %llx/%llx\n",
+ gd->bd->bi_dram[i].start,
+ gd->bd->bi_dram[i].size);
+ continue;
+ }
+#endif
versal_mem_map[banks].virt = gd->bd->bi_dram[i].start;
versal_mem_map[banks].phys = gd->bd->bi_dram[i].start;
versal_mem_map[banks].size = gd->bd->bi_dram[i].size;
--
2.25.1
