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doc: riscv: Update documentation for Sipeed MAIX boards

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The MAIXDUINO runs fine with the sipeed_maix_bitm_defconfig but a different
board id parameter should be passed to kflash.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
This commit is contained in:
Heinrich Schuchardt 2020-07-28 20:05:30 +02:00 committed by Andes
parent 6a43e3a167
commit 137dc153fd
1 changed files with 66 additions and 9 deletions
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75
doc/board/sipeed/maix.rst
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@ -1,8 +1,8 @@
.. SPDX-License-Identifier: GPL-2.0+
.. Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
Maix Bit
========
MAIX
====
Several of the Sipeed Maix series of boards cotain the Kendryte K210 processor,
a 64-bit RISC-V CPU. This processor contains several peripherals to accelerate
@ -13,8 +13,10 @@ peripherals include 8M of SRAM (accessible with and without caching); remappable
pins, including 40 GPIOs; AES, FFT, and SHA256 accelerators; a DMA controller;
and I2C, I2S, and SPI controllers. Maix peripherals vary, but include spi flash;
on-board usb-serial bridges; ports for cameras, displays, and sd cards; and
ESP32 chips. Currently, only the Sipeed Maix Bit V2.0 (bitm) is supported, but
the boards are fairly similar.
ESP32 chips.
Currently, only the Sipeed MAIX BiT V2.0 (bitm) and Sipeed MAIXDUINO are
supported, but the boards are fairly similar.
Documentation for Maix boards is available from
`Sipeed's website <http://dl.sipeed.com/MAIX/HDK/>`_.
@ -26,20 +28,42 @@ details are rather lacking, so most technical reference has been taken from the
Build and boot steps
--------------------
To build u-boot, run
To build U-Boot, run
.. code-block:: none
make sipeed_maix_bitm_defconfig
make <defconfig>
make CROSS_COMPILE=<your cross compile prefix>
To flash u-boot to a maix bit, run
To flash U-Boot, run
.. code-block:: none
kflash -tp /dev/<your tty here> -B bit_mic u-boot-dtb.bin
kflash -tp /dev/<your tty here> -B <board_id> u-boot-dtb.bin
Boot output should look like the following:
The board provides two serial devices, e.g.
* /dev/serial/by-id/usb-Kongou_Hikari_Sipeed-Debug_12345678AB-if00-port0
* /dev/serial/by-id/usb-Kongou_Hikari_Sipeed-Debug_12345678AB-if01-port0
Which one is used for flashing depends on the board.
Currently only a small subset of the board features are supported. So we can
use the same default configuration and device tree. In the long run we may need
separate settings.
======================== ========================== ========== ==========
Board defconfig board_id TTY device
======================== ========================== ========== ==========
Sipeed MAIX BiT sipeed_maix_bitm_defconfig bit first
Sipeed MAIX BiT with Mic sipeed_maix_bitm_defconfig bit_mic first
Sipeed MAIXDUINO sipeed_maix_bitm_defconfig maixduino first
Sipeed MAIX GO goE second
Sipeed MAIX ONE DOCK goD first
======================== ========================== ========== ==========
Flashing causes a reboot of the device. Parameter -t specifies that the serial
console shall be opened immediately. Boot output should look like the following:
.. code-block:: none
@ -238,6 +262,39 @@ Boot Sequence
stage.
8. The boot hart jumps to ``0x80000000``.
Resetting the board
^^^^^^^^^^^^^^^^^^^
The MAIX boards can be reset using the DTR and RTS lines of the serial console.
How the lines are used depends on the specific board. See the code of kflash.py
for details.
This is the reset sequence for the MAXDUINO and MAIX BiT with Mic:
.. code-block:: python
def reset(self):
self.device.setDTR(False)
self.device.setRTS(False)
time.sleep(0.1)
self.device.setDTR(True)
time.sleep(0.1)
self.device.setDTR(False)
time.sleep(0.1)
and this for the MAIX Bit:
.. code-block:: python
def reset(self):
self.device.setDTR(False)
self.device.setRTS(False)
time.sleep(0.1)
self.device.setRTS(True)
time.sleep(0.1)
self.device.setRTS(False)
time.sleep(0.1)
Memory Map
^^^^^^^^^^