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Surfans F20 "NAND open error"

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amachronic:
It's a new NAND device (GD5F1GQ5xExx). It's nearly identical to the GD5F1GQ4xExx which is already supported. Try this bootloader, you should be able to get a backup with it. Either check the backup with hexdump yourself, or post it here and I'll check it, just to make sure it looks sane before you go doing any destructive operations.

bootloader-erosq-GD5F1GQ5xExx.zip

Octso:

--- Quote from: amachronic on November 30, 2023, 04:58:00 PM ---It's a new NAND device (GD5F1GQ5xExx). It's nearly identical to the GD5F1GQ4xExx which is already supported. Try this bootloader, you should be able to get a backup with it. Either check the backup with hexdump yourself, or post it here and I'll check it, just to make sure it looks sane before you go doing any destructive operations.

bootloader-erosq-GD5F1GQ5xExx.zip

--- End quote ---

Thank you for answering so swiftly!

I am now able to make the backup and get the flash_onfi_info dump, which looks identical to one in the previous page of this thread

--- Code: ---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 code ---

I have checked the .bin hexdump and it does resemble what is mentioned in the Ingenic X1000 wiki, but if you could double check just to be sure, that would be amazing

amachronic:
It looks good to me, you should be safe to flash the Rockbox bootloader.

mxl:
Hey! Looks like I've got yet another different flash chip. Would someone be willing to help me?

Info: Surfans F20, firmware version 2.7. Using the provided bootloader (version 221029) with jztool succeeds but the flash is unreadable ("NAND open error"). Running RockBox without flashing the bootloader works fine.

Here's the flash_info.txt:


--- Code: ---readID opcode  = FF C8 51 C8
readID address = C8 51 C8 51
readID dummy   = C8 51 C8 51
sfc params0  = 06 05 04 03
sfc params1  = 02 55 AA 55
sfc params2  = 00 2B 02 02
sfc params3  = B4 2F 00 00
--- End code ---

This looks nearly identical to the result from #54 except for the second byte in "readID opcode" so I went ahead and tried the GD5F1GQ5xExx bootloader. Indeed I can get the flash_onfi_info.txt from that:


--- Code: ---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 code ---

And a dump of the bootloader is uploaded here: https://drive.google.com/file/d/1SJYx_1-k-rohSZB975wPYFB99gObhx-B/view?usp=sharing , does it look reasonable?

amachronic:

--- Quote from: mxl on December 17, 2023, 11:13:39 PM ---And a dump of the bootloader is uploaded here: https://drive.google.com/file/d/1SJYx_1-k-rohSZB975wPYFB99gObhx-B/view?usp=sharing , does it look reasonable?

--- End quote ---

Yep, it seems ok.

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