[ECOS] Re: booting from ROM

[Gary Thomas]

On Wed, 2001-10-17 at 01:59, Warren Jasper wrote:
> I posted a similar question a few weeks ago.  I believe the problem is NOT
> in the linker scripts.  When I tried to run the "hello world"
> program from ROM (that worked correctly from RAM via gdb),
> I could not get the UARTS to work correctly.  I even changed
> printf to diag_printf, but that did not help.  I tried
> just reading/writing to memory, and that works great, so
> large parts of the startup is working correctly, only
> the serial I/O is not. I have a custom board that is VERY
> similar to the brutus/assabet ports.
> 
> If anybody has actually tested the "hello world" program
> to run out of ROM, I sure would like to know what you configured in
> the .ecc file and any other files to get it to work.
> 

Ever hear of RedBoot? :-)  Honestly, this is just another eCos
application (although it uses minimal eCos facilities), configured
to execute from ROM.

>From the above description, it's not obvious that you've told eCos
that this application should start from ROM.  You must set
  CYG_HAL_STARTUP == ROM
for this to work.  This changes the memory maps to coorespond with
ROM applications, includes additional system startup code, etc.

You can't just take a RAM application and expect it to run from ROM.

> Warren
> 
> -----Original Message-----
> From: Robert Lee [ mailto:rlee_1900@yahoo.com ]
> Sent: Tuesday, October 16, 2001 12:47 PM
> To: ecos-discuss@sourceware.cygnus.com
> Subject: [ECOS] Re: booting from ROM
> 
> 
> Hello,
> 
> I found the following message about running "hello
> world" from ROM.  
> 
> Can anybody tell me what is MLT?  Where can I find
> more information?  Why jflsh hello.bin to Assabet
> doesn't work.  Thank you for your help.
> 
> 
> > Tue, 09 Oct 2001 20:56:59 +0100 
> > 
> > You need to make new MLT files (.ldi and .h at
> least) > for your ROM.
> >
> > Do a grep for CYG_HAL_STARTUP in the assabet and 
> > brutus HALs to see what
> > else is affected by the startup type.
> >
> > Jifl
> 
> =====
> Robert Lee
> Software Engineer
> 
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