diff options
Diffstat (limited to 'roms/u-boot/arch/arm/cpu/arm926ejs/spear/start.S')
| -rw-r--r-- | roms/u-boot/arch/arm/cpu/arm926ejs/spear/start.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/cpu/arm926ejs/spear/start.S b/roms/u-boot/arch/arm/cpu/arm926ejs/spear/start.S new file mode 100644 index 000000000..9ac96291b --- /dev/null +++ b/roms/u-boot/arch/arm/cpu/arm926ejs/spear/start.S @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * armboot - Startup Code for ARM926EJS CPU-core + * + * Copyright (c) 2003 Texas Instruments + * + * ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------ + * + * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> + * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> + * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> + * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com> + * Copyright (c) 2003 Kshitij <kshitij@ti.com> + */ + + +#include <config.h> + +/* + ************************************************************************* + * + * Startup Code (reset vector) + * + * The BootROM already initialized its own stack in the [0-0xb00] reserved + * range of the SRAM. The SPL (in _main) will update the stack pointer to + * its own SRAM area (right before the gd section). + * + ************************************************************************* + */ + + .globl reset + .globl back_to_bootrom + +reset: + /* + * SPL has to return back to BootROM in a few cases (eg. Ethernet boot, + * UART boot, USB boot): save registers in BootROM's stack and then the + * BootROM's stack pointer in the SPL's data section. + */ + push {r0-r12,lr} + ldr r0, =bootrom_stash_sp + str sp, [r0] + + /* + * Flush v4 I/D caches + */ + mov r0, #0 + mcr p15, 0, r0, c7, c7, 0 /* Flush v3/v4 cache */ + mcr p15, 0, r0, c8, c7, 0 /* Flush v4 TLB */ + + /* + * Enable instruction cache + */ + mrc p15, 0, r0, c1, c0, 0 + orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ + mcr p15, 0, r0, c1, c0, 0 + + /* + * Go setup Memory and board specific bits prior to relocation. + * This call is not supposed to return. + */ + b _main /* _main will call board_init_f */ + +back_to_bootrom: + pop {r0-r12,pc} |