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Surfans F20 "NAND open error"

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kaas:

--- Quote from: flash_onfi_info.txt ---signature = 2222AAAA
revision = AAAA
manufacturer = "ÿÿÿÿÿÿÿÿÿÿÿÿ"
device model = "ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ"
JEDEC mf. id = FF
data bytes per page = 4294967295
spare bytes per page = 65535
pages per block = 4294967295
blocks per lun = 4294967295
number of luns = 255
bits per cell = 255
max bad blocks = 65535
block endurance = 65535
programs per page = 255
page program time = 65535
block erase time = 65535
page read time = 65535

--- End quote ---
And here is the bootloader backup. Although using the bootloader went fine I did not go ahead flashing it, since the datasheet values don't seem to match up (e.g. spare bytes per page is 4x higher in the txt than in the datasheet), I may be misinterpreting it however.

amachronic:
It's not reading data off the chip properly, the data is mostly 0xff, so yeah flashing it would be a really bad idea. Not sure what's wrong. I'll try reducing the clock speed & disable quad I/O, and double check for any mistakes I might've made.

amachronic:
Here's another build, try dumping the ONFI info and take a bootloader backup again. I wouldn't advise flashing it.
https://drive.google.com/file/d/1IJjG_zZxdSxNZK3XM-nAeaJzVnR2oHcK/view?usp=sharing

kaas:

--- Quote from: flash_onfi_info.txt ---probed chip ID = EF AA 21
signature = FFFFFFFF
revision = FFFF
manufacturer = "ÿÿÿÿÿÿÿÿÿÿÿÿ"
device model = "ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ"
JEDEC mf. id = FF
data bytes per page = 4294967295
spare bytes per page = 65535
pages per block = 4294967295
blocks per lun = 4294967295
number of luns = 255
bits per cell = 255
max bad blocks = 65535
block endurance = 65535
programs per page = 255
page program time = 65535
block erase time = 65535
page read time = 65535

--- End quote ---
Bootloader backup. Thanks again for your continued efforts.

amachronic:
That last dump was almost good but shifted by one byte. This build should fix it.
https://drive.google.com/file/d/1LQtakDKCNTGvXU-u9QVYc056nN78CkDl/view?usp=sharing

Try another bootloader backup. No need to bother with the ONFI info this time.

Also, could you unzip a daily build to your SD and run rockbox directly from the bootloader? You don't need to install the bootloader, just select the Rockbox boot option while you're in the bootloader. EDIT: I forgot to mention, this is so you can check if rockbox actually works. If they changed the flash there's no guarantee the rest of the hardware is the same as older units.

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