249 lines
8.5 KiB
Plaintext
249 lines
8.5 KiB
Plaintext
README
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======
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This directory contains the port of NuttX to the Beaglebone Black board
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See http://beagleboard.org for information about Beaglebone Black. This
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board is based around the TI AM335x Sitara Cortex-A8 CPU.
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This port was developed on the rev. C of the board:
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Beaglebone Black (See http://beagleboard.org/black)
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ITEMS DETAILS
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-------------------- ---------------------------------------------------
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CPU 1GHz ARM Cortex-A8
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GPU SG530 3D, 20M Polygons/S
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DRAM 512MB DDR3 800MHz
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Onboard Storage 4GB, 8bit Embedded MMC, microSD card (TF) slot for up to 32GB
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Video Output HDMI
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Extension Interface 2.54mm Headers, 92 pins
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Network interface 10/100Mbps RJ45
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Power 5V, 1000mA
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Overall Size 3.4" X 2.15"
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Main features of the TI AM335x Sitara
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(See http://www.ti.com/product/am3358):
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CPU
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- ARM Cortex-A8
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- 32KB I-Cache
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- 32KB D-Cache
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- 256KB L2 Cache with ECC
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FPU
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- NEON SIMD Coprocessor
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Memory
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- 176KB of On-Chip Boot ROM
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- 64KB of Dedicated RAM
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- 64KB of General-Purpose On-Chip Memory Controller (OCMC) RAM
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- 16-bit DDR2/DDR3
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- Memory capacity up to 8G bits
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- 8-Bit and 16-Bit Asynchronous Memory Interface with up to Seven Chip Selects (NAND, NOR, Muxed-NOR, SRAM)
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Boot Devices
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- NAND Flash
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- SPI NOR Flash
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- SD Card
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- UART
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TODO:
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Contents
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========
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- Beaglebone black Rev.C Connectors
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- Serial Console
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- LEDs
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- Buttons
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- JTAG
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- Booting NuttX from an SD card
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- Configurations
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Beaglebone black Rev.C Connectors
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=====================
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Serial Console
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==============
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By default, the serial console will be provided on UART0 in all of these
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configurations.
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UART0 is available on the 6-pin Debug connector:
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Pin 1: GND
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Pin 2: N/C
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Pin 3: N/C
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Pin 4: B_UART0_RX / UART0_RX / PIN E15
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Pin 5: B_UART0_TX / UART0_TX / PIN E16
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Pin 6: N/C
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PIN E16: UART0_TXD/SPI1_CS1/DCAN0_RX/I2C2_SCL/ECAP1_IN_PWM1_OUT/
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PR1_PRU1_PRU_R30_15/PR1_PRU1_PRU_R31_15/GPIO1_11
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PIN E15: UART0_RXD/SPI1_CS0/DCAN0_TX/I2C2_SDA/ECAP2_IN_PWM2_OUT/
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PR1_PRU1_PRU_R30_14/PR1_PRU1_PRU_R31_14/GPIO1_10
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LEDs
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====
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The Beaglebone black Rev. C has four blue LEDs; three can be controlled from software.
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Two are tied to ground and, hence, illuminated by driving the output pins to a high
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value:
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1. LED0 GPMC_A5 GPMC_A5/GMII2_TXD0/RGMII2_TD0/RMII2_TXD0/GPMC_A21/
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PR1_MII1_RXD3/eQEP1B_IN/GPIO1_21
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2. LED1 GPMC_A6 GPMC_A6/GMII2_TXCLK/RGMII2_TCLK/MMC2_DAT4/GPMC_A22/
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PR1_MII1_RXD2/eQEP1_INDEX/GPIO1_22
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3. LED2 GPMC_A7 GPMC_A7/GMII2_RXCLK/RGMII2_RCLK/MMC2_DAT5/GPMC_A23/
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PR1_MII1_RXD1/eQEP1_STROBE/GPIO1_23
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4. LED3 GPMC_A8 GPMC_A8/GMII2_RXD3/RGMII2_RD3/MMC2_DAT6/GPMC_A24/
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PR1_MII1_RXD0/MCASP0_ACLKX/GPIO1_24
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These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
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defined. In that case, the usage by the board port is defined in
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include/board.h and src/am335x_leds.c. The LEDs are used to encode OS-related
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events as follows:
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SYMBOL Meaning LED state
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LED1 LED3 LED4
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----------------- ----------------------- ---- ---- ------------
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LED_STARTED NuttX has been started ON OFF OFF
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LED_HEAPALLOCATE Heap has been allocated OFF ON OFF
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LED_IRQSENABLED Interrupts enabled ON ON OFF
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LED_STACKCREATED Idle stack created ON ON OFF
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LED_INIRQ In an interrupt N/C N/C Soft glow
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LED_SIGNAL In a signal handler N/C N/C Soft glow
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LED_ASSERTION An assertion failed N/C N/C Soft glow
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LED_PANIC The system has crashed N/C N/C 2Hz Flashing
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LED_IDLE MCU is is sleep mode Not used
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After booting, LED1 and 3 are not longer used by the system and can be used for
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other purposes by the application (Of course, all LEDs are available to the
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application if CONFIG_ARCH_LEDS is not defined.
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Buttons
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=======
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JTAG
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====
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Booting NuttX from an SD card
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=============================
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These are the steps to get U-Boot booting from SD Card:
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1. Configure and build the NuttX Beaglebone Black configuration. You
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should have a file called nuttx.bin when the build completes.
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2. Insert a FLASH stick into the host PC and format it for FAT32 FS.
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3. Copy nuttx.bin into FLASH stick root.
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4. Remove the FLASH stick from the host PC. Insert into the Beaglebone
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Black microSD slot.
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5. Connect a RS-232 Converted or USB serial adapter onto the Beaglebone
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Black board and open a serial terminal on the host PC to communicate
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with the target.
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6. Reset the Stop Beaglebone Black boot. You should see output from
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U-boot in the serial console. Stop the normal boot-up sequence
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after the U-Boot prompt before Linux is started.:
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Hit any key to stop autoboot: 0
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U-Boot#
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7. Load Nuttx into memory from the U-Boot prompt and run
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U-Boot# load mmc 0 0x8a000000 nuttx.bin
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U-Boot# go 0x8a000000
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If your are running the 'nsh' configuration you then should see:
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NuttShell (NSH)
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nsh>
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Configurations
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==============
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Information Common to All Configurations
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----------------------------------------
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Each Beaglebone Black configuration is maintained in a sub-directory and
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can be selected as follow:
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tools/configure.sh [OPTIONS] beaglebone-black:<subdir>
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Where [OPTIONS] include -l to configure for a Linux host platform and
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-c means to configure for a Windows Cygwin host platform. -h will give
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you the list of all options.
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Before building, make sure the PATH environment variable includes the
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correct path to the directory than holds your toolchain binaries.
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And then build NuttX by simply typing the following. At the conclusion of
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the make, the nuttx binary will reside in an ELF file called, simply, nuttx.
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make
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The <subdir> that is provided above as an argument to the tools/configure.sh
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must be is one of the following.
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NOTES:
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1. These configurations use the mconf-based configuration tool. To
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change any of these configurations using that tool, you should:
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a. Build and install the kconfig-mconf tool. See nuttx/README.txt
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see additional README.txt files in the NuttX tools repository.
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b. Execute 'make menuconfig' in nuttx/ in order to start the
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reconfiguration process.
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2. Unless stated otherwise, all configurations generate console
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output on UART0.
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3. All of these configurations use the Code Sourcery for Windows toolchain
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(unless stated otherwise in the description of the configuration). That
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toolchain selection can easily be reconfigured using 'make menuconfig'.
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Here are the relevant current settings:
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Build Setup:
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CONFIG_HOST_WINDOWS=y : Microsoft Windows
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CONFIG_WINDOWS_CYGWIN=y : Using Cygwin or other POSIX environment
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System Type -> Toolchain:
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CONFIG_ARMV7A_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery for Windows
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Configuration Sub-directories
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-----------------------------
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lcd:
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This is an NSH configuration based on the nsh configuration belong but
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with LCD support enabled. This configuration will be used for developing
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and verifying basic LCD functionality.
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NOTES:
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1. The framebuffer is assumed to reside at address 0x80000000 and has a
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maximum size 0x0a000000, although probably less than 1Mb will actually
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be used for the framebuffer.
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2. The HDMI interface is assumed. The TDA19988 HDMI interface is enabled.
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STATUS:
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2019-07-09: This is very much a work in progress and not suitable for
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any use other than testing.
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nsh:
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This configuration directory provide the NuttShell (NSH). There are
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STATUS:
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2019-01-06: Work in progress. Till now it is possible to pass arm_boot(), but
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Prefetch abort is met when devnull_register() call is done. Have no idea why.
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I was able to trace down to _inode_search() call. If I put any debug statement
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like "up_lowputc('0');" right after "desc->node = node;" statement at line 425
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the code does not crash.
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2019-01-09: The NSH configuration is now functional.
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2019-01-16: Correct timer interrupts by switching to DMTimer2 (DMTimer1ms is
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not initialized by U-Boot).
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