From 2b1930e9e048d38ca6ef05ab7f927f3649fe4a01 Mon Sep 17 00:00:00 2001 From: Siva Durga Prasad Paladugu Date: Fri, 12 Jan 2018 15:35:46 +0530 Subject: [PATCH] arm64: zynqmp: Provide a config to not map DDR region in MMU table DDR less systems are possible for configuration like mini qspi and making DDR region as normal memory may cause speculative access which results u-boot hang if DDR is absent. So, this patch fixes the issue by not making DDR memory region entry into MMU table. Future solution is to prepare MMU table per memory node in dts instead of hard code DDR addresses. Signed-off-by: Siva Durga Prasad Paladugu Signed-off-by: Michal Simek --- arch/arm/cpu/armv8/zynqmp/Kconfig | 6 ++++++ arch/arm/cpu/armv8/zynqmp/cpu.c | 16 ++++++++++++---- 2 files changed, 18 insertions(+), 4 deletions(-) diff --git a/arch/arm/cpu/armv8/zynqmp/Kconfig b/arch/arm/cpu/armv8/zynqmp/Kconfig index 79e67bf30f2..8dca451c6df 100644 --- a/arch/arm/cpu/armv8/zynqmp/Kconfig +++ b/arch/arm/cpu/armv8/zynqmp/Kconfig @@ -72,6 +72,12 @@ config ZYNQMP_QSPI config ZYNQMP_USB bool "Configure ZynqMP USB" +config ZYNQMP_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. + config SYS_MALLOC_F_LEN default 0x600 diff --git a/arch/arm/cpu/armv8/zynqmp/cpu.c b/arch/arm/cpu/armv8/zynqmp/cpu.c index 4596d6bff47..bc77dd03c36 100644 --- a/arch/arm/cpu/armv8/zynqmp/cpu.c +++ b/arch/arm/cpu/armv8/zynqmp/cpu.c @@ -17,20 +17,24 @@ DECLARE_GLOBAL_DATA_PTR; static struct mm_region zynqmp_mem_map[] = { +#if !defined(CONFIG_ZYNQMP_NO_DDR) { .virt = 0x0UL, .phys = 0x0UL, .size = 0x80000000UL, .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_INNER_SHARE - }, { + }, +#endif + { .virt = 0x80000000UL, .phys = 0x80000000UL, .size = 0x70000000UL, .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) | PTE_BLOCK_NON_SHARE | PTE_BLOCK_PXN | PTE_BLOCK_UXN - }, { + }, + { .virt = 0xf8000000UL, .phys = 0xf8000000UL, .size = 0x07e00000UL, @@ -52,13 +56,17 @@ static struct mm_region zynqmp_mem_map[] = { .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) | PTE_BLOCK_NON_SHARE | PTE_BLOCK_PXN | PTE_BLOCK_UXN - }, { + }, +#if !defined(CONFIG_ZYNQMP_NO_DDR) + { .virt = 0x800000000UL, .phys = 0x800000000UL, .size = 0x800000000UL, .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_INNER_SHARE - }, { + }, +#endif + { .virt = 0x1000000000UL, .phys = 0x1000000000UL, .size = 0xf000000000UL, -- 2.47.3