Vector Table

[Chris Sparks]

Has anyone tried using compact flash as ROM, instead of as a hard disk?

Chris

Ralf Corsepius wrote:

>On Tue, 2003-11-11 at 15:10, James Yates wrote:
>  
>
>>Can anyone tell me why my vector table is empty? When I run the hello
>>sample application, it fails to run but think this is something to do
>>with a missing vector table.
>>
>>See part of map file below:
>>
>>.monvects       0x00000000        0x0
>>                0x00000000                _monvects = .
>>
>>.monram         0x008d1000        0x0
>>                0x008d1000                _ramstart = .
>>
>>.vects          0x00800200        0x0
>>                0x00800200                _vectab = .
>> *(.vects)
>>                0x00800600                . = 0x800600
>>
>>.interp
>> *(.interp)
>>    
>>
>Looks like an excerpt of an sh1/sh2 linker script to me (I am the
>original author) ;)
>
>The .monvects sections is assumed to be located in ROM, and therefore is
>not initialized by RTEMS images.
>
>The .vects section is assumed to be initialized by the compiler's
>startup code and/or RTEMS initialization code.
>
>Background: Our boards, the gensh1-BSP is derived from was equipped with
>a ROM containing a gdb-stub, CMON-support (Hitachi debugger) and
>board-initialization code. All RAM was battery-backed. We used gdb over
>a serial to download images, and could boot either from ROM (through
>gdb) or directly from preloaded images in battery backed RAM.
>
>Therefore, we could use 3 different vector tables, 1 in ROM, 1 initial
>vector table in battery-backed RAM (treated read-only) and the actual
>(dynamic) vector table in RAM.
>
>May-be this explains your confusion about the SH-vector tables.
>
>Ralf
>
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