1 /* 2 * (C) Copyright 2016 Linaro 3 * Jon Medhurst <tixy@linaro.org> 4 * 5 * TC2 specific code for Versatile Express. 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <asm/io.h> 11 12 #define SCC_BASE 0x7fff0000 13 14 bool armv7_boot_nonsec_default(void) 15 { 16 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT 17 return false 18 #else 19 /* 20 * The Serial Configuration Controller (SCC) register at address 0x700 21 * contains flags for configuring the behaviour of the Boot Monitor 22 * (which CPUs execute from reset). Two of these bits are of interest: 23 * 24 * bit 12 = Use per-cpu mailboxes for power management 25 * bit 13 = Power down the non-boot cluster 26 * 27 * It is only when both of these are false that U-Boot's current 28 * implementation of 'nonsec' mode can work as expected because we 29 * rely on getting all CPUs to execute _nonsec_init, so let's check that. 30 */ 31 return (readl((u32 *)(SCC_BASE + 0x700)) & ((1 << 12) | (1 << 13))) == 0; 32 #endif 33 } 34