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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/arm720t/start.S | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot/arch/arm/cpu/arm720t/start.S')
| -rw-r--r-- | roms/u-boot/arch/arm/cpu/arm720t/start.S | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/cpu/arm720t/start.S b/roms/u-boot/arch/arm/cpu/arm720t/start.S new file mode 100644 index 000000000..ecb4e44fd --- /dev/null +++ b/roms/u-boot/arch/arm/cpu/arm720t/start.S @@ -0,0 +1,79 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * armboot - Startup Code for ARM720 CPU-core + * + * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> + * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> + */ + +#include <asm-offsets.h> +#include <config.h> + +/* + ************************************************************************* + * + * Startup Code (reset vector) + * + * do important init only if we don't start from RAM! + * relocate armboot to ram + * setup stack + * jump to second stage + * + ************************************************************************* + */ + + .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! + */ +#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \ + !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY) + bl cpu_init_crit +#endif + + bl _main + +/*------------------------------------------------------------------------------*/ + + .globl c_runtime_cpu_setup +c_runtime_cpu_setup: + + mov pc, lr + +/* + ************************************************************************* + * + * CPU_init_critical registers + * + * setup important registers + * setup memory timing + * + ************************************************************************* + */ + +#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \ + !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY) +cpu_init_crit: + + mov ip, lr + /* + * before relocating, we have to setup RAM timing + * because memory timing is board-dependent, you will + * find a lowlevel_init.S in your board directory. + */ + bl lowlevel_init + mov lr, ip + + mov pc, lr +#endif /* CONFIG_SKIP_LOWLEVEL_INIT */ |