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Problem making bootable SD Card

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Offline c_joerg

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Problem making bootable SD Card
« on: 23 / February / 2019, 03:09:20 »
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I just cannot get an SD card bootable with EOScard on my M3. But it had to work before…

When I do that in the camera, it always works.
The information that I afterwards with EOScard got  differ in the value behind BOOTDISK
I've already tried this with 2 different cards and different EOScard versions….
I got no Errors from EOScard…
« Last Edit: 23 / February / 2019, 03:11:37 by c_joerg »
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Offline msl

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Re: Problem making bootable SD Card
« Reply #1 on: 23 / February / 2019, 03:39:26 »
Did you ever try to set "bootdisk" with a hex editor, e.g. HxD. What happens then?

msl
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Offline c_joerg

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Re: Problem making bootable SD Card
« Reply #2 on: 23 / February / 2019, 03:58:58 »
Quote from: msl on 23 / February / 2019, 03:39:26
Did you ever try to set "bootdisk" with a hex editor, e.g. HxD.
No. Never…
To which position? Uppercase or lowercase?

What do the different values say after BOOTDISK (0x05c vs 0x1EO)?

Maybe that explains the problems I have with a SCRIPT SD Card
https://chdk.setepontos.com/index.php?topic=13699.msg139564#msg139564

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Offline msl

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Re: Problem making bootable SD Card
« Reply #3 on: 23 / February / 2019, 04:40:28 »
For me, using a hex editor is the easiest way to make a sd card bootable. HxD is a portable program. Choose the right drive!

You just have to write the string BOOTDISK (uppercase!) to a specific address:

FAT16 0x40
FAT32 0x1E0

msl
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Offline waterwingz

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Re: Problem making bootable SD Card
« Reply #4 on: 23 / February / 2019, 06:31:02 »
I'm not sure that I follow exactly what you have done but the BOOTDISK string is being written to different addresses in the two photos you posted?
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Offline c_joerg

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Re: Problem making bootable SD Card
« Reply #5 on: 23 / February / 2019, 11:18:04 »
Quote from: waterwingz on 23 / February / 2019, 06:31:02
I'm not sure that I follow exactly what you have done but the BOOTDISK string is being written to different addresses in the two photos you posted?
Yes of course, that’s the problem.
CHDK writes to 0x1E0
EOScard writes to 0x05C
Quote from: msl on 23 / February / 2019, 04:40:28
FAT32 0x1E0
But why EOScard writes to 0x05C?
EOScard write SCRIPT to 0x1F0. Is this correct?

https://chdk.fandom.com/wiki/EOScard
Step 11 => I can’t change the Address in EOScard to 0x1E0 .


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Offline c_joerg

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Re: Problem making bootable SD Card
« Reply #6 on: 27 / February / 2019, 00:42:19 »
Hello, I'm still wondering what went wrong. I cannot change the address in EOScard. Is it really that EOScard writes to the wrong address?

How could this never work?
https://chdk.fandom.com/wiki/EOScard

I probably always did that only with CHDK ...

For me that explains at least why some people for their M3 did not manage to get a bootable SD card.
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Offline Ant

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Re: Problem making bootable SD Card
« Reply #7 on: 27 / February / 2019, 09:51:27 »
For me the solution was:
1. Filling the first 100MB of SD card by zeros.
2. Formatting SD card in the camera.
3. Executing EOScard.
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Offline c_joerg

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Re: Problem making bootable SD Card
« Reply #8 on: 27 / February / 2019, 10:49:57 »
Quote from: Ant on 27 / February / 2019, 09:51:27
1. Filling the first 100MB of SD card by zeros.

And that makes the difference?

Quote from: Ant on 27 / February / 2019, 09:51:27
3. Executing EOScard.

To which address (0x1E0 or 0x05C)?

As long as you have a CHDK camera with firmware update method, you can create the bootable SD synonymous with it.
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Offline Ant

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Re: Problem making bootable SD Card
« Reply #9 on: 27 / February / 2019, 13:29:00 »
Quote from: c_joerg on 27 / February / 2019, 10:49:57
And that makes the difference?
This procedure clears MBR, partition table, PBR. Probably it depends.

Quote
To which address (0x1E0 or 0x05C)?
Don't remember. By default.
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