RISC OS Open: Forum: Rewriting parts of hal ..

Mar 1, 2013 4:38pm

Hi

I think I have decided to rewrite some parts of the HAL to GAS syntax and perhaps even build them outside RO with a plain arm-elf toolchain.
The reason for this is to be able to run it with jtag. As I stated in the “elf files” thread in the General forum: I have experimented with !Link’s elf
output but with little success.

Another thing I will tryout is the AsAsm assembler.

Michael

Mar 2, 2013 9:02am

Michael Grunditz (467) 531 posts

OK, I skip the GAS idea. I also prefer ObjAsm syntax. But I don’t think I can do without elf. I don’t mean to make the changes official , its just that I got stuck last time I tried to port RISC OS somewhere in the borderlines between HAL and kernel code. That code is long gone , but this time I want to use jtag so I know what happens. AsAsm seems to output suitable elf’s but I still have the problem with getting the start address to be something not 0×0.

Mar 2, 2013 12:35pm

Rick Murray (539) 13840 posts

I do not like GAS, and I believe that there others that do not like GAS.

<raises hand> That’s the assembler in the GNU toolchain, right?

http://www.heyrick.co.uk/blog/index.php?diary=20110404

Mar 2, 2013 3:02pm

Michael Grunditz (467) 531 posts

Haveyou thought about temperarely adding some serial output instead? It may be easier than using JTAG if the target has a UART of some form.

Yes ofc , I have done that in the past and will continue to do it. The problem is when I get stuck somewhere where serial output is impossible. Anyway , I just managed tp get a AsAsm assembled program work in gdb+jlink , including branching \o/ . I will stick with elf for a while than switch to AOF , when most things work.

Mar 3, 2013 8:45pm

Raik (463) 2061 posts

Hello Michael. Another question, sorry. Have you continued the Freescale port or not? The second would be unfortunate.
Best

Mar 4, 2013 10:02am

Michael Grunditz (467) 531 posts

Hello Michael. Another question, sorry. Have you continued the Freescale port or not? The second would be unfortunate.

Yes that is what all this is about :) The problem was that my previous attempts was lost in a harddisk failure. I have moved on from MX51 to MX53 with quad core MX6 in the pipeline. I am much more confident in my new toolchain with JTAG etc.. so I think it will work better this time.

Rewriting parts of hal ..

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Mar 1, 2013 4:38pm Michael Grunditz (467) 531 posts	Hi I think I have decided to rewrite some parts of the HAL to GAS syntax and perhaps even build them outside RO with a plain arm-elf toolchain. The reason for this is to be able to run it with jtag. As I stated in the “elf files” thread in the General forum: I have experimented with !Link’s elf output but with little success. Another thing I will tryout is the AsAsm assembler. Michael

Mar 2, 2013 9:02am Michael Grunditz (467) 531 posts	OK, I skip the GAS idea. I also prefer ObjAsm syntax. But I don’t think I can do without elf. I don’t mean to make the changes official , its just that I got stuck last time I tried to port RISC OS somewhere in the borderlines between HAL and kernel code. That code is long gone , but this time I want to use jtag so I know what happens. AsAsm seems to output suitable elf’s but I still have the problem with getting the start address to be something not 0×0.

Mar 2, 2013 12:35pm Rick Murray (539) 13840 posts	I do not like GAS, and I believe that there others that do not like GAS. <raises hand> That’s the assembler in the GNU toolchain, right? http://www.heyrick.co.uk/blog/index.php?diary=20110404

Mar 2, 2013 3:02pm Michael Grunditz (467) 531 posts	Haveyou thought about temperarely adding some serial output instead? It may be easier than using JTAG if the target has a UART of some form. Yes ofc , I have done that in the past and will continue to do it. The problem is when I get stuck somewhere where serial output is impossible. Anyway , I just managed tp get a AsAsm assembled program work in gdb+jlink , including branching \o/ . I will stick with elf for a while than switch to AOF , when most things work.

Mar 3, 2013 8:45pm Raik (463) 2061 posts	Hello Michael. Another question, sorry. Have you continued the Freescale port or not? The second would be unfortunate. Best

Mar 4, 2013 10:02am Michael Grunditz (467) 531 posts	Hello Michael. Another question, sorry. Have you continued the Freescale port or not? The second would be unfortunate. Yes that is what all this is about :) The problem was that my previous attempts was lost in a harddisk failure. I have moved on from MX51 to MX53 with quad core MX6 in the pipeline. I am much more confident in my new toolchain with JTAG etc.. so I think it will work better this time.