Legend

Overview

The Legend board family contains three revisions: 25hdd, 25ssd, and 35.

The Legend 2.5” HDD board (revision 25hdd) can be found in the Seagate FireCuda Gaming Hard Drive, Gaming Drive for Xbox and Gaming Drive for PlayStation devices. A 2.5” drive and two chips are embedded: an ASMedia ASM1153 USB-to-SATA bridge controller and a STM32F070 MCU. The former is handling the USB to HDD I/Os while the latter is dedicated to the LED effects. The two chips are connected together through I2C.

The Legend 2.5” SSD board (revision 25ssd) is found in the Seagate SSD Gaming Drive for Xbox. A Realtek RTS5411S USB hub is embedded and connected to a Phison U17 2.5” SSD, as well as a STM32F070 MCU.

The Legend 3.5” board (revision 35) can be found in the Seagate FireCuda Gaming Hub and Gaming Drive Hub for Xbox devices. A Genesys Logic GL3523-S USB hub is connected to an ASMedia ASM1153 USB-to-SATA bridge controller and a STM32F070 MCU. The two chips are connected together using I2C.

On all boards, the Zephyr port is running on the STM32F070 MCU.

Seagate FireCuda Gaming Hard Drive Seagate FireCuda Gaming Hub

Hardware

  • STM32F070cb MCU:

    • ARM Cortex-M0+

    • 16KB SRAM

    • 128KB on-chip flash

  • External devices connected to the STM32F070cb MCU:

    • ASMedia ASM1153 USB-to-SATA bridge (I2C master on port 1) (HDD only)

    • 6 (hdd) or 4 (ssd) Everlight B1414 LEDs connected on SPI1 MOSI

    • 1 white LED (HDD only)

    • 64KB external SPI flash connected on SPI2

Supported Features

All the hardware features available on the Legend boards are supported by Zephyr.

Interface

Controller

Driver/Component

NVIC

on-chip

nested vector interrupt controller

SYSTICK

on-chip

systick

CLOCK

on-chip

clock and reset control

GPIO

on-chip

gpio

I2C

on-chip

i2c master/slave controller

UART

on-chip

serial

SPI flash

on-chip

spi_nor

LED strip

on-chip

ws2812

USB

on-chip

usb

Connections and IOs

Name

Function

Usage

PB6

I2C1

I2C1 SCL (HDD only)

PB7

I2C1

I2C1 SDA (HDD only)

PA10

UART

USART0 RX

PA9

UART

USART0 TX

PB0

PWM

Activity LED (HDD only)

PB12

SPI2

SPI2 Enable

PB13

SPI2

SPI2 Clock

PB14

SPI2

SPI2 MISO

PB15

SPI2

SPI2 MOSI

PA7

LED strip

SPI1 MOSI

PA12

USB

USB DM (25ssd and 35 only)

PA13

USB

USB DP (25ssd and 35 only)

Programming and Debugging

Flashing

The STM32F070cb MCU can be flashed by connecting an external debug probe to the SWD port (on-board 4-pin header). In the default OpenOCD configuration, the ST Link interface is selected. You may need to replace it with the interface of your debug probe.

Once the debug probe is connected to both the Legend board and your host computer, then you can simply run the west flash command to write a firmware image into flash.

Debugging

Please refer to the Flashing section and run the west debug command instead of west flash.

References