CHDK ARM mode ? - General Discussion and Assistance - CHDK Forum

CHDK ARM mode ?

  • 4 Replies
  • 3611 Views
CHDK ARM mode ?
« on: 15 / May / 2008, 19:50:45 »
Advertisements
Anybody know what version of ARM the DigiC II and DigiC III are running?
Are they also running in Thumb mode? V6 or above?

I just want to use the LDRH, STRH on non word or half word aligned addresses.
Same for LDRB and STRB on odd addresses.

Thanks,

*

Offline fe50

  • ******
  • 3152
  • IXUS50 & 860, SX10 Star WARs-Star RAWs
    • fe50
Re: CHDK ARM mode ?
« Reply #1 on: 16 / May / 2008, 05:30:03 »
Hi tointech,

perhaps you'll find some informations in this post, here or in the CHDK source code...


*

Offline jeff666

  • ****
  • 181
  • A720IS
Re: CHDK ARM mode ?
« Reply #2 on: 16 / May / 2008, 06:21:44 »
Anybody know what version of ARM the DigiC II and DigiC III are running?
Are they also running in Thumb mode? V6 or above?

core/ is built in Thumb mode
platform/ and loader/ in ARM mode

Quote
I just want to use the LDRH, STRH on non word or half word aligned addresses.
Same for LDRB and STRB on odd addresses.

The CPU (tested on digic3) executes (at least) STRD but our compiler complains about that command.
People have encountered weird effects when using other gcc-builds, so we stick to our limited but working gcc and avoid "unusual" commands.

Cheers.

*

Offline reyalp

  • ******
  • 14121
Re: CHDK ARM mode ?
« Reply #3 on: 21 / July / 2008, 22:55:09 »
Another newbie here. I had the same question as toinech about which chip is used and found this thread in search.

Then I noticed the second string in the A540 firmware dump is
Code: [Select]
ROM:FFC01250 0000001A C Victoria - ARM946ES (ARM)This strongly suggests the following ARM core (or derivative thereof)
ARM Information Center
A technical reference manual is available for download there.

Maybe this is all old news, but I didn't see it in a quick search or any of the links above.
Don't forget what the H stands for.


*

Offline fe50

  • ******
  • 3152
  • IXUS50 & 860, SX10 Star WARs-Star RAWs
    • fe50
Re: CHDK ARM mode ?
« Reply #4 on: 22 / July / 2008, 03:15:48 »
Hello & welcome reyalp,

every information is welcome here, thx for sharing this one !

 

Related Topics


SimplePortal 2.3.6 © 2008-2014, SimplePortal