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 pan@semihalf.com --- 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); +}