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arm64: versal: Disable DDR cache mapping if DDR is not enabled

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Similar change was done in past by commit 3b644a3c2f
("arm64: zynqmp: Provide a config to not map DDR region in MMU table").

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2020-03-18 13:45:21 +01:00
parent b8c3d3f45f
commit 98da86681e
2 changed files with 15 additions and 0 deletions
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6
arch/arm/mach-versal/Kconfig
View File

@ -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

9
arch/arm/mach-versal/cpu.c
View File

@ -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;