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arm: caches: protect dram_bank_mmu_setup access to bi_dram

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Add protection in dram_bank_mmu_setup() to avoid access to bd->bi_dram
before relocation.

This patch allow to use the generic weak function dram_bank_mmu_setup
to activate the MMU and the data cache in SPL or in U-Boot before
relocation, when bd->bi_dram is not yet initialized.

In this cases, the MMU must be initialized explicitly with
mmu_set_region_dcache_behaviour function.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
This commit is contained in:
Patrick Delaunay
2020-04-24 20:20:15 +02:00
committed by Tom Rini
parent f8dc7f2f18
commit c8ec1e3ff5
1 changed files with 4 additions and 0 deletions
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4
arch/arm/lib/cache-cp15.c
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@@ -91,6 +91,10 @@ __weak void dram_bank_mmu_setup(int bank)
bd_t *bd = gd->bd; bd_t *bd = gd->bd;
int i; int i;
/* bd->bi_dram is available only after relocation */
if ((gd->flags & GD_FLG_RELOC) == 0)
return;
debug("%s: bank: %d\n", __func__, bank); debug("%s: bank: %d\n", __func__, bank);
for (i = bd->bi_dram[bank].start >> MMU_SECTION_SHIFT; for (i = bd->bi_dram[bank].start >> MMU_SECTION_SHIFT;
i < (bd->bi_dram[bank].start >> MMU_SECTION_SHIFT) + i < (bd->bi_dram[bank].start >> MMU_SECTION_SHIFT) +