How to use SPI NOR flash on a v1.2 Duo

Duo
1

Can I solder a 3.3v SPI NOR flash chip to the 8 pin header on the board? The pinout looks correct for such a chip and there’s 3.3V on the correct power pin. Will the 1.0.5 software notice the chip and make it available as a MTD device or similar?

If not, what type of chip is appropriate for that header.

Thank you!

2

It’s for EMMC style memory, search for symbol shown on schematics of board.

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3

Cool, thanks. Any idea if I were to populate it would it be recognized by the current build of Linux?

4

looks like here:

must be edited

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5

Thank you. That looks oddly like SDIO connected WiFi, but it might be worth a try. I wonder if I can connect another uSD card to these signals. That might be a bit easier to do. It would be an interesting test at least.

Thanks again for your help.

6

On V1.2, it is SD NAND, and the IOB board can be welded with NOR FLASH W25Q256, which is usable. But to use NAND FLASH W25N01, a resistor needs to be welded, but the official tag number map has not been released

7

I’m looking at v1.2 schematic and I’m confused.
It shows connections which are parallel with SD slot.
I ask if to be sure I cannot use soldered SD NAND and SD card simultanously?

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8

No you cannot use both. As you noticed, they share all the same signals.

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9

Well, that’s unfortunate. I guess this pad is just wasted space as long as the uSD socket is in use.