Merge pull request #1000 from dp-arm/dp/aarch32-boot
juno/aarch32: Fix boot on Cortex A57 and A72
diff --git a/plat/arm/board/juno/aarch64/juno_helpers.S b/plat/arm/board/juno/aarch64/juno_helpers.S
index 8d00a1a..5e7f08e 100644
--- a/plat/arm/board/juno/aarch64/juno_helpers.S
+++ b/plat/arm/board/juno/aarch64/juno_helpers.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -266,6 +266,16 @@
* to AArch32 mode is then requested by writing into RMR_EL3.
*/
func juno_reset_to_aarch32_state
+ /*
+ * Invalidate all caches before the warm reset to AArch32 state.
+ * This is required on the Juno AArch32 boot flow because the L2
+ * unified cache may contain code and data from when the processor
+ * was still executing in AArch64 state. This code only runs on
+ * the primary core, all other cores are powered down.
+ */
+ mov x0, #DCISW
+ bl dcsw_op_all
+
emit_movw w0, BL32_BASE
emit_movt w1, BL32_BASE
/* opcode "bx r0" to branch using r0 in AArch32 mode */
diff --git a/plat/arm/board/juno/juno_bl2_setup.c b/plat/arm/board/juno/juno_bl2_setup.c
index 8f18531..abceb0f 100644
--- a/plat/arm/board/juno/juno_bl2_setup.c
+++ b/plat/arm/board/juno/juno_bl2_setup.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -29,4 +29,28 @@
return err;
}
+
+/*
+ * We need to override some of the platform functions when booting SP_MIN
+ * on Juno AArch32.
+ */
+
+static unsigned int scp_boot_config;
+
+void bl2_early_platform_setup(meminfo_t *mem_layout)
+{
+ arm_bl2_early_platform_setup(mem_layout);
+
+ /* Save SCP Boot config before it gets overwritten by SCP_BL2 loading */
+ VERBOSE("BL2: Saving SCP Boot config = 0x%x\n", scp_boot_config);
+ scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR);
+}
+
+void bl2_platform_setup(void)
+{
+ arm_bl2_platform_setup();
+
+ mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config);
+ VERBOSE("BL2: Restored SCP Boot config = 0x%x\n", scp_boot_config);
+}
#endif /* JUNO_AARCH32_EL3_RUNTIME */