[U-Boot,13/20] imx8m: Fix MMU table issue for OPTEE memory
diff mbox series

Message ID 20190128094807.26532-14-peng.fan@nxp.com
State Changes Requested
Delegated to: Stefano Babic
Headers show
Series
  • imx: add i.MX8MM support
Related show

Commit Message

Peng Fan Jan. 28, 2019, 9:39 a.m. UTC
When running with OPTEE, the MMU table in u-boot does not remove the OPTEE
memory from its settings. So ARM speculative prefetch in u-boot may access
that OPTEE memory. Due to trust zone is enabled by OPTEE and that memory
is set to secure access, then the speculative prefetch will fail and cause
various memory issue in u-boot.
The fail address register and int_status register in trustzone has logged
that speculative access from u-boot.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 arch/arm/mach-imx/imx8m/soc.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

Patch
diff mbox series

diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index 4160a75918..5634bfb96a 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -112,16 +112,18 @@  static struct mm_region imx8m_mem_map[] = {
 		/* DRAM1 */
 		.virt = 0x40000000UL,
 		.phys = 0x40000000UL,
-		.size = 0xC0000000UL,
+		.size = PHYS_SDRAM_SIZE,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 			 PTE_BLOCK_OUTER_SHARE
+#ifdef PHYS_SDRAM_2_SIZE
 	}, {
 		/* DRAM2 */
 		.virt = 0x100000000UL,
 		.phys = 0x100000000UL,
-		.size = 0x040000000UL,
+		.size = PHYS_SDRAM_2_SIZE,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 			 PTE_BLOCK_OUTER_SHARE
+#endif
 	}, {
 		/* List terminator */
 		0,
@@ -130,6 +132,20 @@  static struct mm_region imx8m_mem_map[] = {
 
 struct mm_region *mem_map = imx8m_mem_map;
 
+void enable_caches(void)
+{
+	/*
+	 * If OPTEE runs, remove OPTEE memory from MMU table to
+	 * avoid speculative prefetch. OPTEE runs at the top of
+	 * the first memory bank
+	 */
+	if (rom_pointer[1])
+		imx8m_mem_map[5].size -= rom_pointer[1];
+
+	icache_enable();
+	dcache_enable();
+}
+
 static u32 get_cpu_variant_type(u32 type)
 {
 	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;