diff options
Diffstat (limited to 'cpu/xscale/start.S')
| -rw-r--r-- | cpu/xscale/start.S | 60 |
1 files changed, 38 insertions, 22 deletions
diff --git a/cpu/xscale/start.S b/cpu/xscale/start.S index 3d9784e..95b30e4 100644 --- a/cpu/xscale/start.S +++ b/cpu/xscale/start.S @@ -4,8 +4,10 @@ * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> * Copyright (C) 2000 Wolfgang Denk <wd@denx.de> - * Copyright (c) 2001 Alex Züpke <azu@sysgo.de> - * Copyright (c) 2002 Kyle Harris <kharris@nexus-tech.net> + * Copyright (C) 2001 Alex Züpke <azu@sysgo.de> + * Copyright (C) 2002 Kyle Harris <kharris@nexus-tech.net> + * Copyright (C) 2003 Robert Schwebel <r.schwebel@pengutronix.de> + * Copyright (C) 2003 Kai-Uwe Bloehm <kai-uwe.bloem@auerswald.de> * * See file CREDITS for list of people who contributed to this * project. @@ -26,8 +28,6 @@ * MA 02111-1307 USA */ - - #include <config.h> #include <version.h> @@ -136,13 +136,16 @@ reset: bl cpu_init_crit /* we do sys-critical inits */ -relocate: /* relocate U-Boot to RAM */ - adr r0, _start /* r0 <- current position of code */ +relocate: /* relocate U-Boot to RAM */ + adr r0, _start /* r0 <- current position of code */ + ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ + cmp r0, r1 /* don't reloc during debug */ + beq stack_setup + ldr r2, _armboot_start ldr r3, _armboot_end - sub r2, r3, r2 /* r2 <- size of armboot */ - ldr r1, _TEXT_BASE - add r2, r0, r2 /* r2 <- source end address */ + sub r2, r3, r2 /* r2 <- size of armboot */ + add r2, r0, r2 /* r2 <- source end address */ copy_loop: ldmia r0!, {r3-r10} /* copy from source address [r0] */ @@ -151,6 +154,9 @@ copy_loop: ble copy_loop /* Set up the stack */ + +stack_setup: + ldr r0, _uboot_reloc /* upper 128 KiB: relocated uboot */ sub r0, r0, #CFG_MALLOC_LEN /* malloc area */ /* FIXME: bdinfo should be here */ @@ -183,7 +189,7 @@ _start_armboot: .word start_armboot /* */ /****************************************************************************/ - /* Interrupt-Controller base address */ +/* Interrupt-Controller base address */ IC_BASE: .word 0x40d00000 #define ICMR 0x04 @@ -191,19 +197,19 @@ IC_BASE: .word 0x40d00000 RST_BASE: .word 0x40f00030 #define RCSR 0x00 - /* Operating System Timer */ +/* Operating System Timer */ OSTIMER_BASE: .word 0x40a00000 #define OSMR3 0x0C #define OSCR 0x10 #define OWER 0x18 #define OIER 0x1C - /* Clock Manager Registers */ -#ifdef CFG_CPUSPEED +/* Clock Manager Registers */ CC_BASE: .word 0x41300000 #define CCCR 0x00 cpuspeed: .word CFG_CPUSPEED -#endif + + /* RS: ??? */ .macro CPWAIT mrc p15,0,r0,c2,c0,0 @@ -219,13 +225,16 @@ cpu_init_crit: mov r1, #0x00 str r1, [r0, #ICMR] -#ifdef CFG_CPUSPEED +#if defined(CFG_CPUSPEED) + /* set clock speed */ ldr r0, CC_BASE ldr r1, cpuspeed str r1, [r0, #CCCR] - mov r0, #3 + mov r0, #2 mcr p14, 0, r0, c6, c0, 0 + +setspeed_done: #endif /* @@ -429,15 +438,21 @@ fiq: #endif -/************************************************************************/ -/* */ -/* Reset function: the PXA250 has no reset function, so we have to */ -/* perform a watchdog timeout to cause a reset. */ -/* */ -/************************************************************************/ +/****************************************************************************/ +/* */ +/* Reset function: the PXA250 doesn't have a reset function, so we have to */ +/* perform a watchdog timeout for a soft reset. */ +/* */ +/****************************************************************************/ + .align 5 .globl reset_cpu + + /* FIXME: this code is PXA250 specific. How is this handled on */ + /* other XScale processors? */ + reset_cpu: + /* We set OWE:WME (watchdog enable) and wait until timeout happens */ ldr r0, OSTIMER_BASE @@ -456,3 +471,4 @@ reset_cpu: reset_endless: b reset_endless + |