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Helios64 Hardware Detailed Info (#27)

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* Add detailed hardware info for Helios64
    - Button
    - Ethernet
    - Front Panel
    - GPIO
    - I2C
    - Jumper
    - LED
    - M.2
    - PMIC
    - PWM Fan
    - RTC
    - SATA
    - SPI
    - UEXT
    - UPS
    - USB

* Cosmetic upgrade and adapt to latest mkdocs-material version

Co-authored-by: nurix <nurix@pnsnc.local>
Co-authored-by: Aditya Prayoga <aditya@kobol.io>
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Gauthier Provost 2020-04-20 16:06:24 +08:00 • committed by GitHub
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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](https://www.winbond.com/hq/product/code-storage-flash-memory/serial-nor-flash/?__locale=en&partNo=W25Q128JV)
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)](/helios64/uext)
![P2 Location](/helios64/img/spi/uext.jpg)
![!UEXT](/helios64/img/spi/spi_on_uext.png)
| Pin | Signal Name |
|-----|-------------|
| 7 | MISO |
| 8 | MOSI |
| 9 | SCK |
| 10 | SSEL |
**Note:** The pin voltage level is 3.3V.