From eeb4a71a3565098ba43aeb83be163731065a039d Mon Sep 17 00:00:00 2001

From: Alan Carvalho de Assis alan.assis@freescale.com Date: Sun, 5 Oct 2008 19:57:22 -0300 Subject: [PATCH] iMX31: Reducing start.S size to let boot from NAND

iMX31 NAND Flash Controller has a 2KB RAM buffer, but the current start.S file is too much big to let NAND copy routine to fit in. This patch will reduce the start.S when booting from NAND Flash.

Signed-off-by: Alan Carvalho de Assis alan.assis@freescale.com --- cpu/arm1136/start.S | 24 ++++++++++++++++++++++-- 1 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/cpu/arm1136/start.S b/cpu/arm1136/start.S index 51b664d..b24fe41 100644 --- a/cpu/arm1136/start.S +++ b/cpu/arm1136/start.S @@ -32,6 +32,15 @@ #include <version.h> .globl _start _start: b reset +#ifdef CONFIG_BOOT_FROM_NAND + b . /* Undefined Instruction */ + b . /* Software Interrupt */ + b . /* Prefetch Abort */ + b . /* Data Abort */ + b . /* Reserved */ + b . /* IRQ */ + b . /* FIQ */ +#else #ifdef CONFIG_ONENAND_IPL ldr pc, _hang ldr pc, _hang @@ -68,6 +77,7 @@ _irq: .word irq _fiq: .word fiq _pad: .word 0x12345678 /* now 16*4=64 */ #endif /* CONFIG_ONENAND_IPL */ +#endif /* CONFIG_BOOT_FROM_NAND */ .global _end_vect _end_vect:

@@ -151,6 +161,7 @@ next: bl cpu_init_crit #endif

+_cstartup: #ifndef CONFIG_SKIP_RELOCATE_UBOOT relocate: /* relocate U-Boot to RAM */ adr r0, _start /* r0 <- current position of code */ @@ -239,12 +250,18 @@ cpu_init_crit: * Jump to board specific initialization... The Mask ROM will have already initialized * basic memory. Go here to bump up clock rate and handle wake up conditions. */ +#ifdef CONFIG_BOOT_FROM_NAND + ldr sp, =CFG_INTERNAL_SRAM_STACK /* Initial stack point in the SRAM */ + ldr r0, =_cstartup /* load the return address */ + mov lr, r0 /* set the return address after remap */ + b lowlevel_init /* relative branch enables remap */ +#endif mov ip, lr /* persevere link reg across call */ bl lowlevel_init /* go setup pll,mux,memory */ mov lr, ip /* restore link */ mov pc, lr /* back to my caller */

-#ifndef CONFIG_ONENAND_IPL +#if !defined(CONFIG_ONENAND_IPL) && !defined(CONFIG_BOOT_FROM_NAND) /* ************************************************************************* * @@ -357,11 +374,12 @@ cpu_init_crit: .macro get_fiq_stack @ setup FIQ stack ldr sp, FIQ_STACK_START .endm -#endif /* CONFIG_ONENAND_IPL */ +#endif /* CONFIG_ONENAND_IPL/CONFIG_BOOT_FROM_NAND */

/* * exception handlers */ +#ifndef CONFIG_BOOT_FROM_NAND #ifdef CONFIG_ONENAND_IPL .align 5 do_hang: @@ -436,3 +454,5 @@ arm1136_cache_flush: mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache mov pc, lr @ back to caller #endif /* CONFIG_ONENAND_IPL */ +#endif /* CONFIG_BOOT_FROM_NAND */ +