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| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/u-boot/arch/arm/cpu/arm926ejs/start.S | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot/arch/arm/cpu/arm926ejs/start.S')
| -rw-r--r-- | roms/u-boot/arch/arm/cpu/arm926ejs/start.S | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/cpu/arm926ejs/start.S b/roms/u-boot/arch/arm/cpu/arm926ejs/start.S new file mode 100644 index 000000000..ff592ba81 --- /dev/null +++ b/roms/u-boot/arch/arm/cpu/arm926ejs/start.S @@ -0,0 +1,112 @@ +/* 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> + * Copyright (c) 2010 Albert Aribaud <albert.u.boot@aribaud.net> + */ + +#include <asm-offsets.h> +#include <config.h> +#include <common.h> + +/* + ************************************************************************* + * + * Startup Code (reset vector) + * + * do important init only if we don't start from memory! + * setup Memory and board specific bits prior to relocation. + * relocate armboot to ram + * setup stack + * + ************************************************************************* + */ + + .globl reset + +reset: + /* + * set the cpu to SVC32 mode + */ + mrs r0,cpsr + bic r0,r0,#0x1f + orr r0,r0,#0xd3 + msr cpsr,r0 + + /* + * we do sys-critical inits only at reboot, + * not when booting from ram! + */ +#ifndef CONFIG_SKIP_LOWLEVEL_INIT + bl cpu_init_crit +#endif + + bl _main + +/*------------------------------------------------------------------------------*/ + + .globl c_runtime_cpu_setup +c_runtime_cpu_setup: + + bx lr + +/* + ************************************************************************* + * + * CPU_init_critical registers + * + * setup important registers + * setup memory timing + * + ************************************************************************* + */ +#ifndef CONFIG_SKIP_LOWLEVEL_INIT +cpu_init_crit: + /* + * flush D cache before disabling it + */ + mov r0, #0 +flush_dcache: + mrc p15, 0, r15, c7, c10, 3 + bne flush_dcache + + mcr p15, 0, r0, c8, c7, 0 /* invalidate TLB */ + mcr p15, 0, r0, c7, c5, 0 /* invalidate I Cache */ + + /* + * disable MMU and D cache + * enable I cache if SYS_ICACHE_OFF is not defined + */ + mrc p15, 0, r0, c1, c0, 0 + bic r0, r0, #0x00000300 /* clear bits 9:8 (---- --RS) */ + bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */ +#ifdef CONFIG_SYS_EXCEPTION_VECTORS_HIGH + orr r0, r0, #0x00002000 /* set bit 13 (--V- ----) */ +#else + bic r0, r0, #0x00002000 /* clear bit 13 (--V- ----) */ +#endif + orr r0, r0, #0x00000002 /* set bit 1 (A) Align */ +#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF) + orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ +#endif + mcr p15, 0, r0, c1, c0, 0 + +#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY + /* + * Go setup Memory and board specific bits prior to relocation. + */ + mov r4, lr /* perserve link reg across call */ + bl lowlevel_init /* go setup pll,mux,memory */ + mov lr, r4 /* restore link */ +#endif + mov pc, lr /* back to my caller */ +#endif /* CONFIG_SKIP_LOWLEVEL_INIT */ |