Hello,
I am developing a custom board with motorola's MX1 processor. I have compiled U-Boot successfully for MX1ADS evaluation board (it has SyncFlash instead of flash), and this hardware isn't very different from mine (only difference is flash). I have studied the README and carried out the porting as it is specified, but U-Boot doesn't work, or I don't get anything in serial console.
I'm using BDI2000, and when I try to debug U-Boot the code hangs in relocate function in start.S file. The exact instruction that hangs the gdb is: "sub r2, r3, r2 /* r2 <- size of u-boot */"
1- One problem is that I don't see how the general purpose registers (r0, r1...) values change, i.e. when "ldr r0, _start" is executed, r0 doesn't change, is this normal? (Is it possible to debug start.S with BDI2000?)
When I compile the code,there are no errors or warnings, but a UNDEF_SYM appears:
...
make[1]: Leaving directory `/home/iim/IKOR/LinuxEmpotrado/LinCon/\ build_tools/u-boot/u-boot-1.1.3/common'
UNDEF_SYM=`arm-unknown-linux-gnu-objdump -x lib_generic/libgeneric.a \ board/LinCon/libLinCon.a cpu/arm920t/libarm920t.a cpu/arm920t/imx/libimx.a \ lib_arm/libarm.a fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a \ fs/jffs2/libjffs2.a fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a net/libnet.a \ disk/libdisk.a rtc/librtc.a dtt/libdtt.a drivers/libdrivers.a drivers/sk98lin/libsk98lin.a \ post/libpost.a post/cpu/libcpu.a common/libcommon.a |sed -n -e \ 's/.*(__u_boot_cmd_.*)/-u\1/p'|sort|uniq`;\ arm-unknown-linux-gnu-ld -Bstatic -T \ /home/iim/IKOR/LinuxEmpotrado/LinCon/build_tools/u-boot/u-boot-1.1.3/board/LinCon/u-boot.lds \ -Ttext 0x08f00000 $UNDEF_SYM cpu/arm920t/start.o \
...
2- When I compile u-boot for my Evaluation Board (MX1ADS), this UNDEF_SYM appears, but u-boot works without any problem! Is this a problem, or only a "warning"?
Some configuration parameters:
32MB SDRAM -> 0x08000000-0x0A000000 16MB Flash -> 0x10000000-0x11000000
TEXT_BASE=0x08f00000 (board/<board>/config.mk) CFG_MONITOR_BASE=0x10000000 /* flash base addr */(include/configs/<board>.h) CFG_MONITOR_LEN=0x20000 (include/configs/<board>.h) CFG_LOAD_ADDR=0x08f00000 (include/configs/<board>.h)
arm-linux-objdump -h displays: #arm-unknown-linux-gnu-objdump -h u-boot
u-boot: file format elf32-littlearm
Sections: Idx Name Size VMA LMA File off Algn 0 .text 00012f34 08f00000 08f00000 00008000 2**5 CONTENTS, ALLOC, LOAD, READONLY, CODE 1 .glue_7 00000000 08f12f34 08f12f34 0001af34 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 2 .glue_7t 00000000 08f12f34 08f12f34 0001af34 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 3 .rodata 00000568 08f12f34 08f12f34 0001af34 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 4 .rodata.str1.4 000042b3 08f1349c 08f1349c 0001b49c 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 5 .data 00000933 08f17750 08f17750 0001f750 2**2 CONTENTS, ALLOC, LOAD, DATA 6 .u_boot_cmd 00000378 08f18084 08f18084 00020084 2**2 CONTENTS, ALLOC, LOAD, DATA 7 .bss 00001c2c 08f183fc 08f183fc 000203fc 2**2 ALLOC 8 .stab 00000c90 00000000 00000000 000203fc 2**2 CONTENTS, READONLY, DEBUGGING 9 .stabstr 0000017d 00000000 00000000 0002108c 2**0 CONTENTS, READONLY, DEBUGGING 10 .debug_abbrev 000062dd 00000000 00000000 00021209 2**0 CONTENTS, READONLY, DEBUGGING 11 .debug_info 0003bcf1 00000000 00000000 000274e6 2**0 CONTENTS, READONLY, DEBUGGING 12 .debug_line 00009f00 00000000 00000000 000631d7 2**0 CONTENTS, READONLY, DEBUGGING 13 .debug_frame 00002f6c 00000000 00000000 0006d0d8 2**2 CONTENTS, READONLY, DEBUGGING 14 .debug_pubnames 00001845 00000000 00000000 00070044 2**0 CONTENTS, READONLY, DEBUGGING 15 .debug_aranges 000005a0 00000000 00000000 00071889 2**0 CONTENTS, READONLY, DEBUGGING 16 .debug_str 00003df0 00000000 00000000 00071e29 2**0 CONTENTS, READONLY, DEBUGGING 17 .comment 0000033c 00000000 00000000 00075c19 2**0 CONTENTS, READONLY 18 .debug_ranges 00000288 00000000 00000000 00075f55 2**0 CONTENTS, READONLY, DEBUGGING
Any help will be welcomed!!
Thanks in advance.
Ioritz