Before relocating to SDRAM, the ECC is initialized by clearing the
whole SDRAM. In order to speed this up, dcache_enable is used (see
sdram_init_ecc_bits).
Since commit 503eea451903 ("arm: cp15: update DACR value to activate
access control"), this no longer works, because running code in OCRAM
with the XN bit set causes a page fault. Override dram_bank_mmu_setup
to disable XN in the OCRAM and setup DRAM dcache before relocation.
Signed-off-by: Paweł Anikiel <p...@semihalf.com>
Reviewed-by: Simon Glass <s...@chromium.org>
---
arch/arm/mach-socfpga/misc_arria10.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/arch/arm/mach-socfpga/misc_arria10.c
b/arch/arm/mach-socfpga/misc_arria10.c
index 0ed2adfd84..7ce888d197 100644
--- a/arch/arm/mach-socfpga/misc_arria10.c
+++ b/arch/arm/mach-socfpga/misc_arria10.c
@@ -246,3 +246,29 @@ int qspi_flash_software_reset(void)
return 0;
}
#endif
+
+void dram_bank_mmu_setup(int bank)
+{
+ struct bd_info *bd = gd->bd;
+ u32 start, size;
+ int i;
+
+ /* If we're still in OCRAM, don't set the XN bit on it */
+ if (!(gd->flags & GD_FLG_RELOC)) {
+ set_section_dcache(
+ CONFIG_SYS_INIT_RAM_ADDR >> MMU_SECTION_SHIFT,
+ DCACHE_WRITETHROUGH);
+ }
+
+ /*
+ * The default implementation of this function allows the DRAM dcache
+ * to be enabled only after relocation. However, to speed up ECC
+ * initialization, we want to be able to enable DRAM dcache before
+ * relocation, so we don't check GD_FLG_RELOC (this assumes bd->bi_dram
+ * is set first).
+ */
+ start = bd->bi_dram[bank].start >> MMU_SECTION_SHIFT;
+ size = bd->bi_dram[bank].size >> MMU_SECTION_SHIFT;
+ for (i = start; i < start + size; i++)
+ set_section_dcache(i, DCACHE_DEFAULT_OPTION);
+}
--
2.36.1.476.g0c4daa206d-goog
