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GCC Toolchain for LPC2148 Legay Arm7 (Armv3) [message #1816730]

Tue, 05 November 2019 18:37

Eclipse User

Hi,

I have an old project that appears to have been compiled in WINARM. I was wondering if there is a toolchain out there for Eclipse that I can still program, compile and load this older device?

Most of the toolchains that I see promote Cortex M or Cortex A devices.

Regards,
Lee.

Re: GCC Toolchain for LPC2148 Legay Arm7 (Armv3) [message #1816904 is a reply to message #1816730]

Mon, 11 November 2019 09:31

Eclipse User

At least the ARM GCC from Ubuntu 18.04LTS repository (gcc-arm-none-eabi 6.3.1) compiles ARM7TDMI code happily in both ARM (32 bit) and Thumb (16 bit) modes.
I took one old source (vdprintf.c) and ran: arm-none-eabi-gcc -c -mtune=arm7tdmi -mthumb -Wa,-adhlmns=vdprint.lst -Os vdprintf.c , and got good object and listing.

It seems to me that the compiler builders do not feel the old ARM worth mentioning.

Re: GCC Toolchain for LPC2148 Legay Arm7 (Armv3) [message #1817358 is a reply to message #1816904]

Wed, 20 November 2019 23:06

Eclipse User

Yes, It seems that way to me too. I'm running Windows 10 but looks like I may have to at least run a Virtual Machine. I did get it to compile despite it listing ARMv3 as deprecated. I have the cannot find entry symbol _start; defaulting to 00008000 issue which I believe, if using -nostartfiles, GCC doesn't have a standard entry point. Now how to resolve this isn't very well presented it so will take some more experimenting.
My assembler startup file has the following so no reference to _start.

@ Start main()
.extern main
LDR R0, =main
MOV LR, PC
BX R0
MTrap: B MTrap @ Trap if main() terminated

Re: GCC Toolchain for LPC2148 Legay Arm7 (Armv3) [message #1817391 is a reply to message #1817358]

Thu, 21 November 2019 09:19

Eclipse User

The reference to _start() may be lurking in your linker script - have a look at it.

When developing the ARM code (both ARM7TDMI and Cortexes), I have ended to create an own linker script to each.

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