Hi all,
I'm using arm-linux-gnueabi toolchain for compiling a simple asm program
senda character over the uart. My linker file content is as shown
linker.ld
*********
MEMORY
{
ram : ORIGIN = 0x80200000, LENGTH = 0x10000
}
SECTIONS
{
.text : { *(.text*) } > ram
}
assemblypgm.asm
**********************
#UART base locations from the TRM
.equ UART1.BASE, 0x4806A000
.equ UART2.BASE, 0x4806C000
#According to the Beagleboard-xM System Reference Manual, UART3 is
connected to the serial port.
# vv USE ME USE ME HARD vv
.equ UART3.BASE, 0x49020000
# ^^ USE ME USE ME HARD ^^
.equ UART4.BASE, 0x49042000
#We need to be in ARM mode - we may branch to Thumb mode later if desired.
.arm
_start:
ldr r0,=UART3.BASE
mov r1,#'A'
strb r1,[r0]
_hang:
b _hang
Makefile
**********
ARMGNU = arm-none-eabi
AOPS = --warn --fatal-warnings
COPS = -Wall -Werror -O2 -nostdlib -nostartfiles -ffreestanding
boot.bin: boot.asm
$(ARMGNU)-as assemblypgm.asm -o boot.o
$(ARMGNU)-ld -T linker.ld boot.o -o boot.elf
$(ARMGNU)-objdump -D boot.elf > boot.list
$(ARMGNU)-objcopy boot.elf -O srec boot.srec
$(ARMGNU)-objcopy boot.elf -O binary boot.bin
My problem is that after copying to the BBB using loady - y-modem protocol
and then pressing any key I'm getting a Data Abort Error and the board
restarts. The kernel is stored in eMMC and there is no sd card inserted in
it.
The log of error in my BBB
*******************************
U-Boot# go
0x80200000
## Starting application at 0x80200000
...
data
abort
MAYBE you should read
doc/README.arm-unaligned-accesses
pc : [<80200010>] lr :
[<9f35b2d4>]
sp : 9f238e10 ip : 0000000f fp :
9f2397b8
r10: 00000002 r9 : 9f3ae150 r8 :
9f238f40
r7 : 9f2397c8 r6 : 80200000 r5 : 00000002 r4 :
9f2397cc
r3 : 80200000 r2 : 9f2397cc r1 : 00000021 r0 :
49020000
Flags: nZCv IRQs off FIQs on Mode
SVC_32
Resetting CPU ...
How can I overcome it ??
Reagrds
NISSIN
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