NefMoto > Technical > Reverse Engineering > Me 7.1.1 free ram variables
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Author Topic: Me 7.1.1 free ram variables  (Read 2038 times)
kacperoooni
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« 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!
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benni4000
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« 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
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kacperoooni
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« 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
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« 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.
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kacperoooni
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« 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
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Blazius
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« Reply #5 on: September 15, 2023, 03:30:51 PM »
Disassemble and confirm, only way.

Why do you need IRAM exactly?
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BlackT
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« 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
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fknbrkn
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« 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
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fknbrkn
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« 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
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BlackT
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« 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
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prj
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« Reply #10 on: September 16, 2023, 01:33:03 PM »
Yes it's luck.
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