Re: [ECOS] PID ROM and eCos

[Gary Thomas <gthomas@cambridge.redhat.com>]

On 24-Jan-2001 Jonathan Larmour wrote:
> Gary Thomas wrote:
>> 
>> Look at the startup code for the Cirrus Logic EDB7xxx boards.  They
>> support this configuration where the image in ROM (FLASH or whatever)
>> is linked at an address different from where they are stored.  If
>> this case is detected, the ROM code simply gets copied to RAM at
>> startup time.  Look in the file:
>>   hal/arm/edb7xxx/current/include/hal_platform_setup.h
> 
> Why was it done this way, and not with a more explicit ROMRAM startup type?
> If you have a separate startup type it is more under user control.
> 

It has been this way for more than 18 months - long before the new CDL and
the tools to make adding new/different startup types simple.  Also, I only
did it in a moment since running some code on that platform did not perform
adequately from FLASH, but would from RAM.

> Anyway, you can also refer to the way the mips vrc4373 or sh edk7708 do it,
> which use an explicit ROMRAM startup.

And all the trappings [read details and troubles] that go with it.