NefMoto > Technical > Reverse Engineering > Me 7.1.1 free ram variables
Pages: [1]
« previous next »
Author Topic: Me 7.1.1 free ram variables  (Read 2068 times)
kacperoooni
Full Member
***

Karma: +9/-2
Offline Offline

Posts: 126
« on: September 15, 2023, 01:28:22 PM »
Hi,

Anyone willing to share confirmed free ram variables in IRAM for 4Z7907551R/N? I'm using 0xFB8x adresses but they seems to be used somewhere which results in random ECU resets. Thanks in advance!
Logged
benni4000
Newbie
*

Karma: +0/-1
Offline Offline

Posts: 24
« Reply #1 on: September 15, 2023, 01:30:19 PM »
What are you doing?

Ida Shows you mostly if used or not.
But there is enought free
Logged
kacperoooni
Full Member
***

Karma: +9/-2
Offline Offline

Posts: 126
« Reply #2 on: September 15, 2023, 01:43:16 PM »
Quote from: benni4000 on September 15, 2023, 01:30:19 PM
What are you doing?

Ida Shows you mostly if used or not.
But there is enought free

Not really, addresses used by pointers aren't shown in IDA
« Last Edit: September 15, 2023, 01:45:25 PM by kacperoooni » Logged
prj
Hero Member
*****

Karma: +1072/-481
Offline Offline

Posts: 6035
« Reply #3 on: September 15, 2023, 01:43:53 PM »
Most of upper extram is free, especially the part where the bootloader gets copied to.
Logged
PM's will not be answered, so don't even try.
Log your car properly - WinOLS database - Tools/patches
kacperoooni
Full Member
***

Karma: +9/-2
Offline Offline

Posts: 126
« Reply #4 on: September 15, 2023, 01:54:16 PM »
Quote from: prj on September 15, 2023, 01:43:53 PM
Most of upper extram is free, especially the part where the bootloader gets copied to.

I know about extram free locations, but thanks. Just wanted to go the lazy way and ask about confirmed free locations in internal ram. I'm porting the code I used in 551M and I'm too lazy to add those extp instructions Wink
Logged
Blazius
Hero Member
*****

Karma: +89/-40
Offline Offline

Posts: 1282
« Reply #5 on: September 15, 2023, 03:30:51 PM »
Disassemble and confirm, only way.

Why do you need IRAM exactly?
Logged
BlackT
Hero Member
*****

Karma: +79/-40
Offline Offline

Posts: 1425
« Reply #6 on: September 15, 2023, 06:59:38 PM »
I always go with Xref, if Xref show that variable is only used in my function, that is it. Works every time so far
Logged
fknbrkn
Hero Member
*****

Karma: +186/-24
Offline Offline

Posts: 1454


mk4 1.8T AUM
« Reply #7 on: September 15, 2023, 11:48:01 PM »
Quote from: BlackT on September 15, 2023, 06:59:38 PM
I always go with Xref, if Xref show that variable is only used in my function, that is it. Works every time so far


That's a silly way due to few addressing methods, arrays, eeprom ram copy and so on
Best way is the Ida and log this var at warmup cycle
Logged
fknbrkn
Hero Member
*****

Karma: +186/-24
Offline Offline

Posts: 1454


mk4 1.8T AUM
« Reply #8 on: September 15, 2023, 11:57:29 PM »
Quote from: kacperoooni on September 15, 2023, 01:54:16 PM
I know about extram free locations, but thanks. Just wanted to go the lazy way and ask about confirmed free locations in internal ram. I'm porting the code I used in 551M and I'm too lazy to add those extp instructions Wink

It's a 2 min deal if it's your own code with a sources  Wink
Logged
BlackT
Hero Member
*****

Karma: +79/-40
Offline Offline

Posts: 1425
« Reply #9 on: September 16, 2023, 09:53:02 AM »
Quote from: fknbrkn on September 15, 2023, 11:48:01 PM

That's a silly way due to few addressing methods, arrays, eeprom ram copy and so on
Best way is the Ida and log this var at warmup cycle
I am talking abot IDA, I write variable in custom code and press X, if is not used anywhere else I use it.
Work so far in various ECUs(at least 10 of them with different software) so it is was pre luck I don't know   Huh
Logged
prj
Hero Member
*****

Karma: +1072/-481
Offline Offline

Posts: 6035
« Reply #10 on: September 16, 2023, 01:33:03 PM »
Yes it's luck.
Logged
PM's will not be answered, so don't even try.
Log your car properly - WinOLS database - Tools/patches
Pages: [1]
  Print  
« previous next »
 
Jump to:  

Navigation
Personal Tools
  • November 26, 2024, 04:06:00 AM
  • Welcome, Guest. Please login or register.
    Did you miss your activation email?

    Login with username, password and session length
Search
 
Advanced Search
About Disclaimer
All Rights Reserved 2010 Nefarious Motosports
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Page created in 0.034 seconds with 16 queries. (Pretty URLs adds 0.001s, 0q)