SX260 HS Porting Thread

Hello everyone.  Just got my SX260 HS.  Naturally, the first thing I did was check and dump the firmware.

Here's the firmware info:
Canon PowerShot SX260 HS
P-ID:3244 NT D
Firmware Ver GM1.00B (1.0.0.0)
Adj Ver.005.011
Serial No. XXXXXXXXXXXX
Build: Jan 6 2012  17:07:27
NoError
Mecha Firm Ver. 3.00
MechaDSP Firm Ver. 0.00
Dumped firmware using Canon Basic instructions.
DryOS firmware address is FF000000
Firmware Size: 16 MB
I've hosted the firmware dump at http://dl.dropbox.com/u/8938380/PRIMARY.BIN

Please let me know if there is a more appropriate place to host this dump than my personal Dropbox.

I am a career computer programmer, but I've never done a CHDK port before.  We'll see how smoothly the port goes from here.

Welcome !    CHDK user fe50 will likely pick  up your dump and add it to the CHDK repository on box.com.

Meanwhile,   I assume you've found the pages on the wiki about porting to a new camera ?  This forum and the CHDK IRC channel can be a big help too.

Welcome.

Sounds like you are off to a good start. If you haven't already found it, I'd suggest starting here http://chdk.wikia.com/wiki/Adding_support_for_a_new_camera and also having a look through the other links in http://chdk.wikia.com/wiki/For_Developers

If you want more real-time advice, you can sometimes find developers in the #chdk irc channel on freenode.


edit:
you win this time waterwingz

Form the dump, I see this is the first DryOS R50 camera we've seen. That likely means new encoding values for diskboot and ps.fi2 and possibly a new propset.

At the moment the signature finder (finsig_dryos.c) barfs pretty badly on this new DryOS version.

I'll look at why it is failing and see if I can fix it up so it at least generates the stubs_entry.S file.

Phil.

Revisions 1768 (release-1.0) and 1769 (trunk) contain an updated finsig_dryos that will, hopefully, work correctly with the R50 DryOS version.

There are some functions not found automatically, attached is a stubs_entry2.S file that I think should be correct for the missing functions (DeleteFile_Fut, and MakeDirectory_Fut).

Note: this will all need careful testing to make sure everything is being found correctly. Canon seems to have made some strange changes in this version (like copying a chunk of firmware code to RAM and running it from there).

Phil.

I have found the AF Assist Beam LED address using Canon Basic (binary searches sweeping over ranges of memory and poking them with 0x46 bytes).

To turn on control over the green AF beam, write 0x46 to 0xC022C200.

After this is done, the LED address is 0xC0223030.  Write 0x46 to it to turn it on, 0x44 to turn it off, but if I do this before writing 0x46 to 0xC022C200, nothing will happen.

Is this how other cameras work?

I have found the AF Assist Beam LED address using Canon Basic (binary searches sweeping over ranges of memory and poking them with 0x46 bytes).

To turn on control over the green AF beam, write 0x46 to 0xC022C200.

After this is done, the LED address is 0xC0223030.  Write 0x46 to it to turn it on, 0x44 to turn it off, but if I do this before writing 0x46 to 0xC022C200, nothing will happen.

Is this how other cameras work?

Earlier models used to be less complicated. This page: http://magiclantern.wikia.com/wiki/Register_Map#GPIO_Ports might give a clue about those magic values. Poking random GPIOs may bring some undesired effects, it's not really known how they are wired.

@srsa_4c: interesting read, thanks!

@schapman: you may want to check this post out regarding finding led addresses http://chdk.setepontos.com/index.php?topic=7887.msg83244#msg83244 it's not exahustive or something, but you could check if you can find the same pattern on your camera

OK, Got the LED addresses.

First, enable control by writing 0x46 to the following addresses

0xC022C200 <-- Required for AF Beam control to work
0xC0223000 <-- Required for I/O LED control to work
0xC0223070 <-- Required for I/O LED control to work

After doing this, these are the on/off addresses

0xC0223030 <-- AF Beam
0xC022C028 <-- I/O LED

Write 0x46 to light the LED, 0xCF to turn it off. 

Writing 0x44 will turn off the AF beam, but it won't turn off the I/O LED.  0xCF works for both.