VIM3 spi documentation

Where can I find the documentation related to spi flash memory on vim3 boards. I found this link in the forum but it leads to 404:

@dolani Boot From SPI Flash | Khadas Documentation

Hi, @goenjoy , your updated link is no longer working either.

In fact, we have noticed many VIM3 documentation pages are no longer available. Has this documentation been moved?

E.g. android:vim3:installtoolchains.html [Khadas Docs]

It was available when I returned. However, the company’s document structure has changed since then. Therefore, most of the previous document links have failed. Please see the link below.