Hi Luis,
On 06/08/12 00:00, Luis Alves wrote:
Yesterday I have downloaded latest uClinux-dist (20120620). I was
using uClinux-dist-20120401.
After applying my 68000 changes, when targeting the kernel to be
placed on ROM the linker is giving me extra headers (.rodata, __param
and __modver):
The changes to the linker scripts where made to bring the non-mmu
one more into line with the standard mmu one. That means we use
most of the kernels generic linker symbols. (These occasionally
got broken before, since the non-mmu linker scripts was rolling its
own version of quite a few of the section macros).
[...]
linux-3.x/vmlinux: file format elf32-m68k
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 001b4010 0081 0081 2000 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .rodata 00039a48 1000 009c4010 001b7000 2**4
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 __param 0330 0003aa48 009fda58 001f0a48 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 __modver 0288 0003ad78 009fdd88 001f0d78 2**1
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .data 00014860 0003b000 009fe010 001f1000 2**4
CONTENTS, ALLOC, LOAD, DATA
5 .init.textd8c2 0005 00a13010 00206000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
6 .init.data373c 0005d8c4 00a208d4 002138c4 2**2
CONTENTS, ALLOC, LOAD, DATA
7 .bss caec 00061000 00a24010 00217000 2**4
ALLOC
8 .comment 26d0 00217000 2**0
CONTENTS, READONLY
[...]
So it looks like LMA's are wrong now. What config switches do you
have enabled, and what are they set to for the kernel memory layout?
Important ones to look at are:
CONFIG_RAMBASE
CONFIG_RAMSIZE
CONFIG_VECTORBASE
CONFIG_KERNELBASE
CONFIG_ROM
CONFIG_RAMKERNEL
CONFIG_ROMKERNEL
The CONFIG_ROMKERNEL is particularly important. The linker script
does different things based on that.
With the previous vmlinux-nommu.lds I had:
[...]
linux-3.x/linux: file format elf32-m68k
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 001edd8c 0081 0081 00028000 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00015000 1000 1000 1000 2**4
CONTENTS, ALLOC, LOAD, DATA
2 .init.textd8c2 00016000 00016000 00016000 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
3 .init.data373c 000238c4 000238c4 000238c4 2**2
CONTENTS, ALLOC, LOAD, DATA
4 .bss caec 00027000 00027000 00027000 2**4
ALLOC
5 .comment 26d0 00215d8c 2**0
CONTENTS, READONLY
[...]
And my makefile was generating the linux.bin like this:
[...]
$(CROSS_COMPILE)objcopy -O binary -j .data -j .init.text -j .init.data \
$(ROOTDIR)/$(LINUXDIR)/linux $(IMAGEDIR)/linux.data
You may need to change this too, with the new linker script:
$(CROSS_COMPILE)objcopy -O binary \
-j .rodata \
-j __param \
-j __modver \
-j .data \
-j .init.text \
-j .init.data \
$(ROOTDIR)/$(LINUXDIR)/linux $(IMAGEDIR)/linux.data
Regards
Greg
$(CROSS_COMPILE)objcopy -O binary -j .text \
$(ROOTDIR)/$(LINUXDIR)/linux \
$(IMAGEDIR)/linux.text
cat $(IMAGEDIR)/linux.text $(IMAGEDIR)/linux.data
$(IMAGEDIR)/linuxrom.bin
[...]
I had to replace the new vmlinux-nommu.lds with the previous one to be
able to generate the bin.
How should I modify the objcopy's so that I can use the new vmlinux-nommu.lds ?
Memory layout is like this:
0x0 - 0x7F: ram (8Mb)
0x80 - 0xBF: flash (4Mb)
Kernel being booted at 0x81 and base ram for linux begining at 0x1000
Thanks,
Luis Alves
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