diff options
Diffstat (limited to 'arch/arm/boot/compressed/head-clps7500.S')
| -rw-r--r-- | arch/arm/boot/compressed/head-clps7500.S | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/arm/boot/compressed/head-clps7500.S b/arch/arm/boot/compressed/head-clps7500.S new file mode 100644 index 00000000000..4a8a689d15e --- /dev/null +++ b/arch/arm/boot/compressed/head-clps7500.S @@ -0,0 +1,87 @@ +/* + * linux/arch/arm/boot/compressed/head.S + * + * Copyright (C) 1999, 2000, 2001 Nexus Electronics Ltd + */ + +#include <linux/config.h> + + /* There are three different ways the kernel can be + booted on a 7500 system: from Angel (loaded in RAM), from + 16-bit ROM or from 32-bit Flash. Luckily, a single kernel + image does for them all. */ + /* This branch is taken if the CPU memory width matches the + actual device in use. The default at power on is 16 bits + so we must be prepared for a mismatch. */ + .section ".start", "ax" +2: + b 1f + .word 0xffff + .word 0xb632 @ mov r11, #0x03200000 + .word 0xe3a0 + .word 0x0000 @ mov r0, #0 + .word 0xe3a0 + .word 0x0080 @ strb r0, [r11, #0x80] + .word 0xe5cb + .word 0xf000 @ mov pc, #0 + .word 0xe3a0 +1: + adr r1, 2b + teq r1, #0 + bne .Langel + /* This is a direct-from-ROM boot. Copy the kernel into + RAM and run it there. */ + mov r0, #0x30 + mcr p15, 0, r0, c1, c0, 0 + mov r0, #0x13 + msr cpsr_cxsf, r0 + mov r12, #0x03000000 @ point to LEDs + orr r12, r12, #0x00020000 + orr r12, r12, #0xba00 + mov r0, #0x5500 + str r0, [r12] + mov r0, #0x10000000 + orr r0, r0, #0x8000 + mov r4, r0 + ldr r2, =_end +2: + ldr r3, [r1], #4 + str r3, [r0], #4 + teq r0, r2 + bne 2b + mov r0, #0xff00 + str r0, [r12] +1: + mov r12, #0x03000000 @ point to LEDs + orr r12, r12, #0x00020000 + orr r12, r12, #0xba00 + mov r0, #0xfe00 + str r0, [r12] + + adr lr, 1f + mov r0, #0 + mov r1, #14 /* MACH_TYPE_CLPS7500 */ + mov pc, lr +.Langel: +#ifdef CONFIG_ANGELBOOT + /* Call Angel to switch into SVC mode. */ + mov r0, #0x17 + swi 0x123456 +#endif + /* Ensure all interrupts are off and MMU disabled */ + mrs r0, cpsr + orr r0, r0, #0xc0 + msr cpsr_cxsf, r0 + + adr lr, 1b + orr lr, lr, #0x10000000 + mov r0, #0x30 @ MMU off + mcr p15, 0, r0, c1, c0, 0 + mov r0, r0 + mov pc, lr + + .ltorg + +1: +/* And the rest */ +#include "head.S" |