Me 7.1.1 free ram variables

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kacperoooni

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	Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « Reply #8 on: September 15, 2023, 11:57:29 PM »

Quote from: kacperoooni on September 15, 2023, 01:54:16 PM

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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	Re: Me 7.1.1 free ram variables « 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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	Re: Me 7.1.1 free ram variables « Reply #10 on: September 16, 2023, 01:33:03 PM »

Yes it's luck.


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