Re: [ECOS] ARM 920t queries with eCos

[Jonathan Larmour <jifl at eCosCentric dot com>]

mohanlal jangir wrote:
> I have been working with ARM Integrator board with ARM 920T core module. I
> have linked a hello world application with eCos default kernel. Later I
> converted this image to Motorola S record format. I want this image to load
> and run from RAM. Bootloader on target is bootMonitor. I have question, what
> is relation among following four observations or any of these observations:

For a different bootloader be sure to disable CYGSEM_HAL_USE_ROM_MONITOR 
in your eCos RAM build configuration.

> 1. My target.ld has following lines:
> MEMORY
> {
>     ram : ORIGIN = 0, LENGTH = 0x01000000
> }

That tells eCos where RAM is. That doesn't mean it will start putting code 
there, just that RAM exists.

> 2. While "M" command on bootMonitor prompt gives following message: "Record
> addresses must be between 0x0000C430 and 0x07FD99FC"

That's where the program must be loaded. From the below eCos is loading to 
0x40000.

> 3. and arm-elf-readelf gives following output:
> [mohanlal@knuth test]$ /opt/ecos/gnutools/arm-elf/bin/arm-elf-readelf -S
> a.out
>       There are 14 section headers, starting at offset 0x18bd0:
>
>       Section Headers:
>         [Nr] Name              Type            Addr     Off    Size   ES Flg
> Lk Inf Al
>         [ 0]                   NULL            00000000 000000 000000 00
> 0   0  0
>         [ 1] .fixed_vectors    PROGBITS        00000020 0184c0 000140 00
> 0   0 32

No A flag so not loaded. So ignore the fact it say addr 0x20.

>         [ 2] .rom_vectors      PROGBITS        00040000 008000 000040 00  AX
> 0   0  1

Starts loading here.

[snip]
> 4. My arm integrator manual tells following memory map
> REMAP       S1[1]            map to
>     0                 0                bootROM
>     0                 1                flash
>     1                 x                SSRAM

You don't say what S1[1] is in this context.

Jifl
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