[R&D] A7 R&D thread

Tobi@s

Well-Known Member
App Developer
Joined
Nov 12, 2013
Messages
1,361
Likes
812
Location
Bavaria
Country
Germany
Dash Cam
some
#1
I'm posting this here because we don't have a development releated forums section nor a o803 section, yet.

Also I will add more information as soon as possible.

Ambarella A7 firmware binary specifications
Code:
Byte sex: Little Endian

Firmware header:
header length: 2048 bytes
aligned with "0x00" padding bytes

Partition order:
BST (Bootstrap setup DDR, etc)
BLD (AMBoot loader)
HAL (probably chipset APIs)
PRI (RTOS image)
RFS (Filesystem)
DSP (ucode/microcode, not exactly sure)

Partition start offsets information in fw binary
start: 0x00000000
end: 0x0000007f
length: 128 bytes
data: DWORD

Partition end offsets in fw binary
start: 0x00000080
end: 0x000000ff
length: 128 bytes
data: DWORD

Partition header information in fw binary:

header length: 256 bytes
aligned with "0x00" padding bytes

header data:
crc32: DWORD
version: WORD WORD
date: BYTE BYTE WORD
length: DWORD
memory address: DWORD
flag: DWORD
magic: DWORD
flag2: DWORD

Alignment algorithm:
align = 0x800
int getPaddingSize(int size, int align) {

return (align - (size % align));

}
 
Last edited:
OP
OP
Tobi@s

Tobi@s

Well-Known Member
App Developer
Joined
Nov 12, 2013
Messages
1,361
Likes
812
Location
Bavaria
Country
Germany
Dash Cam
some
#2
Just finished all the unpacker algorithms. Will write a new tool from scratch for A7 firmware editing (will also add A2 support later). It will be called A7Tool :D
New code is a really big performance improvement. Analyzing and unpacking the firmarwe into its sections just took 82ms (yes, milliseconds).
Analyzing and unpacking the RFS section takes 95ms. There have been some minor RFS structure changes (it has folders now).

FW Section/RFS dump from early 0803 firmware: https://drive.google.com/file/d/0B4FRwm9CGCLkckxlVC1xWUVjZTQ/edit?usp=sharing
 

jokiin

Well-Known Member
Manufacturer
Joined
Jan 27, 2013
Messages
40,746
Likes
20,894
Location
Shenzhen, China - Sydney, Australia
Country
China
Dash Cam
Too many ¯\_(ツ)_/¯
#5
Just got this from e-prance. Not sure if this is the current v1.0 firmware or if there is something new. Thoughts?
https://www.dropbox.com/s/be3qq3pw0wz1k0c/34G V1.0 Update Software.rar
going by the folder name they've given you the V1.0 firmware, there has already been improvements made in that version, E-Prance had early pre production samples which had a much earlier firmware version, there is a V2 and V3 done already but still some fine tuning going on, V4 expected maybe tomorrow or the next day to resolve some image quality issues, once that's sorted there will be some feature requests attended to, selectable MPH or KPH display etc that will come in later versions, the feature enhancements should be done in time for mass production though
 
Joined
Apr 22, 2014
Messages
22
Likes
3
Country
Australia
#6
Is there a repo for all firmwares? Also, any known hardware changes between the model I have and the future production ones? (other than the 1080P silkscreen). Some have commented that e-prance is selling fake ones - I don' think this is the case as it definitely has all of the right bits inside.
 

jokiin

Well-Known Member
Manufacturer
Joined
Jan 27, 2013
Messages
40,746
Likes
20,894
Location
Shenzhen, China - Sydney, Australia
Country
China
Dash Cam
Too many ¯\_(ツ)_/¯
#7
no repo for downloads at this stage

lens is being changed from the one you would have on mass production models, not sure if you have the Mini USB or Micro USB version (both are possible), most likely customers would order the Micro USB version though I would think

E-Prance models are not fake, they are just pre production units, I have them too, I wouldn't sell them to an end user though, they're just meant for testing
 
Joined
Apr 22, 2014
Messages
22
Likes
3
Country
Australia
#8
Thanks for your insights jokiin. Do you know what's different about the lens? I recall reading that various vendors could choose different lens options -

Mine has the micro USB on both the GPS mount and the camera.

BTW, Are you here in Sydney?
 

jokiin

Well-Known Member
Manufacturer
Joined
Jan 27, 2013
Messages
40,746
Likes
20,894
Location
Shenzhen, China - Sydney, Australia
Country
China
Dash Cam
Too many ¯\_(ツ)_/¯
#9
lens will be changed to a slightly wider angle version than what you would have now, it should be ok for the lens you have now, V1, V2, V3 and V4 firmware should all be fine with this, mass production it will vary so future updates might not be ideal for your camera but by all accounts the next firmware for yours should see things improved anyway and any future stuff might be more about features and minor tweaks

I'm in China right now but I do live between here and Sydney depending on work
 

reverend

Well-Known Member
Joined
Apr 22, 2014
Messages
5,444
Likes
3,737
Country
United Kingdom
Dash Cam
Too many
#12
Hi folks, would this firmware you're looking at doing also work on the GS6000 fitted with the A7 at all please?
 

Hilts

Well-Known Member
Joined
Mar 24, 2014
Messages
432
Likes
348
Location
Wales
Country
United Kingdom
Dash Cam
SG9665GC, A119S & Mobius B (with capacitor)
#14
@Tobi@s - Is it possible to move this Thread to the new Mini 0803 section?

Looking forward to seeing how this all develops, having just ordered one myself. Currently waiting patiently for the 'Production ready' Mini 0803 to be made available...
 
OP
OP
Tobi@s

Tobi@s

Well-Known Member
App Developer
Joined
Nov 12, 2013
Messages
1,361
Likes
812
Location
Bavaria
Country
Germany
Dash Cam
some
#15
Id like to keep it here because it's not device specific (just testing seems to be 0803-only at the moment).
The information collected here should be the same for all A7 SoCs.
A7Tool will be platform (and not device) specific, also.
 

Hilts

Well-Known Member
Joined
Mar 24, 2014
Messages
432
Likes
348
Location
Wales
Country
United Kingdom
Dash Cam
SG9665GC, A119S & Mobius B (with capacitor)
#16
Id like to keep it here because it's not device specific (just testing seems to be 0803-only at the moment).
The information collected here should be the same for all A7 SoCs.
A7Tool will be platform (and not device) specific, also.
Opps, apologies. I was confused by your first line....
I'm posting this here because we don't have a development releated forums section nor a o803 section, yet.
 
OP
OP
Tobi@s

Tobi@s

Well-Known Member
App Developer
Joined
Nov 12, 2013
Messages
1,361
Likes
812
Location
Bavaria
Country
Germany
Dash Cam
some
#17
When I created the thread there was no 0803 nor a development section. I would have put it in the 0803 section when the development section would not have existed (omg grammar I hate you) cause the 0803 is the device Im going to test/work with in the first place. But since we have this development section I prefer this place :D
 

reverend

Well-Known Member
Joined
Apr 22, 2014
Messages
5,444
Likes
3,737
Country
United Kingdom
Dash Cam
Too many
#20
Is there anything I could test for you from here with the GS6000 A7 I have?

I've got another 7 days where I can send this back to Amazon, but if I can get similar quality out of the GS6000 I'd be happy to keep it tbh. If the Mini0803 has a better quality lens than the GS6000 I have it would be a no brainer to send the GS6000 back and get a Mini0803 though.

I'm guessing it's recoverable via DirectUSB2 if I brick it anyway - is that freely available at all please?
 
Top