* Patches by David Müller, 31 Jan 2003:
- minimal setup for CardBus bridges
- add EEPROM read/write support in the CS8900 driver
- add support for the builtin I2C controller in the Samsung s3c24x0 chips
- add support for MPL's VCMA9 (Samsung s3c2410 based) board
* Patch by Steven Scholz, 04 Feb 2003:
add support for RTC DS1307
* Patch by Reinhard Meyer, 5 Feb 2003:
fix PLPRCR/SCCR init sequence on 8xx to allow for
changes of EBDF by software
* Patch by Vladimir Gurevich, 07 Feb 2003:
"API-compatibility patch" for 4xx I2C driver
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 @@
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 @@
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 @@
/* */
/****************************************************************************/
- /* Interrupt-Controller base address */
+/* Interrupt-Controller base address */
IC_BASE: .word 0x40d00000
#define ICMR 0x04
@@ -191,19 +197,19 @@
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 @@
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 @@
#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_endless:
b reset_endless
+