From: Heinrich Schuchardt Date: Tue, 28 Jul 2020 18:05:30 +0000 (+0200) Subject: doc: riscv: Update documentation for Sipeed MAIX boards X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=137dc153fda936d81b3372061987255056a528d3;p=u-boot.git doc: riscv: Update documentation for Sipeed MAIX boards 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 Reviewed-by: Sean Anderson --- diff --git a/doc/board/sipeed/maix.rst b/doc/board/sipeed/maix.rst index 06e0008b9f..c235cb44a8 100644 --- a/doc/board/sipeed/maix.rst +++ b/doc/board/sipeed/maix.rst @@ -1,8 +1,8 @@ .. SPDX-License-Identifier: GPL-2.0+ .. Copyright (C) 2020 Sean Anderson -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 `_. @@ -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 make CROSS_COMPILE= -To flash u-boot to a maix bit, run +To flash U-Boot, run .. code-block:: none - kflash -tp /dev/ -B bit_mic u-boot-dtb.bin + kflash -tp /dev/ -B u-boot-dtb.bin + +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. -Boot output should look like the following: +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 ^^^^^^^^^^