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Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

So just to be clear, does drm mean digital rights management or direct rendering manager in this case? I think I'm fine with the latter.

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

I think in this case it means Digital rights management BUT I've just opened the drm partition in hex editor and it almost just contains zeros. It seems to be an empty ext4 partition

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

There's a "drm" partition but it's tied to Qualcomm's HW adaptation and it's not in use whatsoever.

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

Quote:

Originally Posted by Raim (Post 1404360)

I took an image of the entire /dev/mmcblk0 from the "fastboot rescue mode". This way I can view the partition layout with parted or gdisk on my computer without risking any damage by accidental modifications.

Not sure if there is anything useful in this, at least some of these have names that may reveal their function. I guess all those "Q*" partitions are something internal from Qualcomm and probably uninteresting. The bootloader chain would be "rpm" -> "sbl1" -> "sbl2" -> "sbl3" -> "aboot" according to some sources on other Qualcomm-based Android phones that turned up on a quick web search (sbl = secondary bootloader).

"persist" is mounted on /persist and appears to contain WLAN driver configuration, including MAC addresses. "drm" is mounted on /drm and it's currently empty despite the standard lost+found directory. No idea about "security" and some of the others, though.

I don't think these partitions are scary, this is just the way it is set up by Qualcomm as vendor. In defense of Jolla, what would be the purpose of documenting this publicly? I would even expect that the documentation provided by Qualcomm is under a NDA…

A comprehensive breakdown and RE effort that may be good to look at (sorry for linking to another forum, but, all for the best intentions, and who says we cant benefit from working cross-forum)
http://forum.xda-developers.com/show....php?t=1856327?

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

Quote:

Originally Posted by Raim (Post 1404360)

I don't think these partitions are scary, this is just the way it is set up by Qualcomm as vendor. In defense of Jolla, what would be the purpose of documenting this publicly? I would even expect that the documentation provided by Qualcomm is under a NDA…

I don't think any NDA can forbid Jolla to document their own device. The partition table gets disclosed anyway by selling it, see above nieldk for evidence. Jolla could definitely tell same thing you could, without breaking any NDA. Probably even more. Like "this partition contains stuff of Qualcom you better don't touch", "this is a bootloader partition and has nothing unusual, you will find similar partitions on a lot of other phones" etc

/j

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

Quote:

Originally Posted by nieldk (Post 1404457)

Hooray this link reliably segfaults konqueror. :-/

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

@joerg_rw well thats basicly it.

p28 is SailfishOS that you can tinker with, rest are not meant for tweaking they are needed for Qualcomm and Jolla HW Adaptation. We dont have any documentation that can be released for p0-27.

p28 is documented in here https://jolla.com/guide/

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

Quote:

Originally Posted by joerg_rw (Post 1404490)

Hooray this link reliably segfaults konqueror. :-/

LOL mission accomplished. I know, the site is not good, slow and you name it. But, there are some useful information.
Probably I will try and exract what is most usefull :)

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

The PDF about the chip is located here

http://d-h.st/xJ9

Re: [HOWTO] Comprehensive Firmware Flashing Guide for Jolla

Quote:

Originally Posted by m4r0v3r (Post 1404511)

The PDF about the chip is located here

http://d-h.st/xJ9

Great! :-D
Gotta love:

Code:

R2475 0[Ohm] 5% 0.050W

P = I^2 * R
I = sqrt( P / R )
;)