kobol-wiki/docs/helios64/spi.md
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RK3399 has 6x SPI controllers with the following features:

  • Support master and slave mode, software-configurable
  • DMA-based or interrupt-based operation
  • Embedded two 32x16bits FIFO for TX and RX operation respectively

On Helios64, the buses are divided into three types: Not Available, System (internal bus) and User (external bus).

Bus Usage Remarks
0 Not Available
1 System Bootable SPI Flash
2 User User Application
3 Not Available
4 Not Available
5 System Reserved for Production use only

Internal Bus

Bus Chip Select Device Remarks
1 0 W25Q128JV Bootable SPI Flash
5 0 W25X20CL SATA Controller ROM

Bootable SPI Flash

Helios64 is equipped with Winbond W25Q128JV 3V 128M-Bit Serial Flash Memory as a Bootable SPI NOR Flash.

This flash contains

  • Preloader & bootloader
Binaries Offset Remarks
Preloader 0x0040 U-Boot TPL & SPL
Bootloader 0x4000 U-Boot & ATF
  • Electronic nameplate data in Security Register

External Bus

Bus Chip Select Remarks
2 0 User Application

SPI Bus for user application is exposed on UEXT header (P2)

P2 Location

!UEXT

Pin Signal Name
7 MISO
8 MOSI
9 SCK
10 SSEL

Note: The pin voltage level is 3.3V.