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Add support for running directly out of flash: 

* Require that the builder Makefile provide a linker script.
* After making sure the MMU is disabled, check to see if
  _etext == __data_start.  If not, then copy the .data contents
  into RAM.
* Put the stack in .bss.
This commit is contained in:
thorpej 2002-02-23 18:19:09 +00:00
parent 7b2a130dc8
commit c39065eb62
2 changed files with 33 additions and 6 deletions
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6
sys/arch/evbarm/stand/gzboot/Makefile.gzboot
View File

@ -1,4 +1,4 @@
# $NetBSD: Makefile.gzboot,v 1.1 2002/02/23 05:41:14 thorpej Exp $
# $NetBSD: Makefile.gzboot,v 1.2 2002/02/23 18:19:09 thorpej Exp $
NOMAN= # defined
@ -77,7 +77,7 @@ cleandir distclean: cleanlibdir
cleanlibdir:
rm -rf lib
LDFLAGS= -M -N -e start
LDFLAGS= -M -e start -T ${LDSCRIPT}
LIBLIST=${LIBSA} ${LIBZ} ${LIBSA} ${LIBKERN} ${LIBSA}
@ -87,7 +87,7 @@ vers.c: ${VERSIONFILE}
${NEWVERSWHAT}
${PROG}: ${STARTFILE} ${OBJS} ${LIBSA} ${LIBZ} ${LIBKERN}
${LD} -o ${BASE}.sym ${LDFLAGS} -Ttext 0x${RELOC} ${STARTFILE} \
${LD} -o ${BASE}.sym ${LDFLAGS} ${STARTFILE} \
${OBJS} ${LIBLIST} > ${BASE}.list
.include <bsd.prog.mk>

33
sys/arch/evbarm/stand/gzboot/srtbegin.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: srtbegin.S,v 1.1 2002/02/23 05:41:14 thorpej Exp $ */
/* $NetBSD: srtbegin.S,v 1.2 2002/02/23 18:19:09 thorpej Exp $ */
/*
* Copyright (c) 2002 Wasabi Systems, Inc.
@ -38,6 +38,8 @@
#include <machine/asm.h>
#include <arm/armreg.h>
#define STACKSIZE 1024
ENTRY(start)
/*
* We assume we've been loaded VA==PA, or that the MMU
@ -52,6 +54,23 @@ ENTRY(start)
nop
nop
/*
* Check to see if &_etext == &__data_start. If not,
* we're most likely built for running from flash,
* and must copy the data segment out to RAM.
*/
add r1, pc, #(Ldata - . - 8)
ldmia r1, {r1-r3}
cmp r1, r2 /* &_etext == &__data_start? */
beq 2f /* yes, in RAM */
/* Copy data segment from ROM to RAM */
1: ldrb r0, [r1], #0x01
strb r0, [r2], #0x01
cmp r2, r3 /* copy done? */
bne 1b
2:
/* Clear the BSS. */
add r1, pc, #(Lbss - . - 8)
ldmia r1, {r1, r2}
@ -63,13 +82,21 @@ ENTRY(start)
bgt 1b
/* Set the stack pointer */
add sp, pc, #(Lstack - . - 8) /* XXX for now */
add r1, pc, #(Lstack - . - 8)
ldr r1, [r1]
add sp, r1, #STACKSIZE
b _C_LABEL(main)
Ldata:
.word _C_LABEL(_etext)
.word _C_LABEL(__data_start)
Lbss:
.word _C_LABEL(_edata)
.word _C_LABEL(_end)
Lstack:
.space 1024 /* XXX for now */
.word Lstackspace
.comm Lstackspace, STACKSIZE