replace *(.init_array .init_array.*) with KEEP(*(.init_array .init_array.*)).
The KEEP statement within a linker script will instruct the linker to keep the specified section, even if no symbols inside it are referenced. This statement is used within the SECTIONS section of the linker script. This becomes relevant when garbage collection is performed at link time, enabled by passing the --gc-sections switch to the linker. The KEEP statement instructs the linker to use the specified section as a root node when creating a dependency graph, looking for unused sections. Essentially forcing the section to be marked as used.
Signed-off-by: cuiziwei <cuiziwei@xiaomi.com>
This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.
README File for the Olimex STR-P711 NuttX Port
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Contents
^^^^^^^^
Olimex STR-P711
Features
Power Supply
GIO Usage
Jumpers
External Interrupts
Development Environment
GNU Toolchain Options
NuttX buildroot Toolchain
Linux OpenOCD with Wiggler JTAG
Windows OpenOCD will Olimex JTAG
MMC/SD Slot
ENC28J60 Module
Configurations
STR71x-Specific Configuration Settings
Olimex STR-P711
^^^^^^^^^^^^^^^
Features:
- MCU: STR711FR2T6 16/32 bit ARM7TDMI™ with 256K Bytes Program Flash,
64K Bytes RAM, USB 2.0, RTC, 12 bit ADC, 4x UARTs, 2x I2C,2x SPI,
5x 32bit TIMERS, 2x PWM, 2x CCR, WDT, up to 50MHz operation
- Standard JTAG connector with ARM 2x10 pin layout for programming/debugging
with ARM-JTAG
- USB connector
- Two channel RS232 interface and drivers
- SD/MMC card connector
- Two buttons
- Trimpot connected to ADC
- Two status LEDs
- Buzzer
- UEXT - 10 pin extension connector for Olimex addon peripherals like MP3,
RF2.4Ghz, RFID etc. modules
- 2x SPI connectors
- I2C connector
- On board voltage regulator 3.3V with up to 800mA current
- Single power supply: 6V AC or DC required, USB port can power the board
- Power supply LED
- Power supply filtering capacitor
- RESET circuit
- RESET button
- 4 MHz crystal oscillator
- 32768 Hz crystal and RTC
Power Supply
6V AC or DC (or powered from USB port)
GIO with on-board connections (others available for prototyping):
SIGNAL DESCRIPTION PIN
------- --------------------- -----
MISO1 BSPI0 to MMC/SD P0.4
MOSI1 " " "" " " P0.5
SCLK1 " " "" " " P0.6
SS1 " " "" " " P0.7
U0RX UART 0 P0.8
U0TX " " " P0.9
U1RX UART 1 P0.10
U1TX " " " P0.11
BUZZ Buzzer P0.13
WAKE-UP Button P0.15
AIN0 Potentiometer (AN_TR) P1.3
LED1 LED 1 P1.8
LED2 LED 2 P1.9
WP MMC/SD write protect P1.10
USBOP USB P1.11
USBON " " P1.12
BUT Button P1.13
CP MMC/SD card present P1.15
Jumpers
STNBY Will pull pin 23 /STDBY low
External Interrupt (XTI) availability.
XTI TQFP64
LINE PIN SIGNAL * OLIMEX USAGE
---- ------ ------------------------- - ------------------------
2 -- P2.8 (Not available in TQFP64)
3 -- P2.9 (Not available in TQFP64)
4 -- P2.10 (Not available in TQFP64)
5 25 P2.11 (Not available in TQFP64)
6 42 P1.11/CANRX USBOP (to USB connector)
7 47 P1.13/HCLK/I0.SCL CLK ??????????????
8 48 P1.14/HRXD/I0.SDA BUT button (PL open, PU closed)
9 53 P0.1/S0.MOSI/U3.RX * SPI0-3 MOSI0
10 54 P0.2/S0.SCLK/I1.SCL * SPI0-5 SCLK0
11 61 P0.6/S1.SCLK * SPI1-5 SCLK1 (also to MMC slot)
12 63 P0.8/U0.RX/U0.TX U0.TX
13 1 P0.10/U1.RX/U1.TX/SC.DATA U1.RX
14 5 P0.13/U2.RX/T2.OCMPA BUZZ (to buzzer circult)
15 20 P0.15/WAKEUP WAKE-UP button (PL open, PU closed)
* Only these pins are available at a
connector and are not dedicated to
other board functions.
Development Environment
^^^^^^^^^^^^^^^^^^^^^^^
Either Linux or Cygwin on Windows can be used for the development environment.
The source has been built only using the GNU toolchain (see below). Other
toolchains will likely cause problems.
GNU Toolchain Options
^^^^^^^^^^^^^^^^^^^^^
The NuttX make system has been modified to support the following different
toolchain options.
1. The NuttX buildroot Toolchain (see below),
2. The ARM EABI GNU toolchain, or
3. The devkitARM GNU toolchain.
All testing has been conducted using the NuttX buildroot toolchain. To use
the CodeSourcery or devkitARM GNU toolchain, you simply need to build the
system as follows:
make # Will build for the NuttX buildroot toolchain
make CROSSDEV=arm-eabi- # Will build for the devkitARM toolchain
make CROSSDEV=arm-none-eabi- # Will build for the ARM EABI GCC toolchain
make CROSSDEV=arm-nuttx-elf- # Will build for the NuttX buildroot toolchain
Of course, hard coding this CROSS_COMPILE value in Make.defs file will save
some repetitive typing.
NOTE: the CodeSourcery and devkitARM toolchains are Windows native toolchains.
The NuttX buildroot toolchain is a Cygwin toolchain. There are several limitations
to using a Windows based toolchain in a Cygwin environment. The three biggest are:
1. The Windows toolchain cannot follow Cygwin paths. Path conversions are
performed automatically in the Cygwin makefiles using the 'cygpath' utility
but you might easily find some new path problems. If so, check out 'cygpath -w'
2. Windows toolchains cannot follow Cygwin symbolic links. Many symbolic links
are used in NuttX (e.g., include/arch). The make system works around these
problems for the Windows tools by copying directories instead of linking them.
But this can also cause some confusion for you: For example, you may edit
a file in a "linked" directory and find that your changes had no effect.
That is because you are building the copy of the file in the "fake" symbolic
directory. If you use a Windows toolchain, you should get in the habit of
making like this:
make clean_context; make CROSSDEV=arm-none-eabi-
An alias in your .bashrc file might make that less painful.
NOTE 1: The CodeSourcery toolchain (2009q1) may not work with default optimization
level of -Os (See Make.defs). It will work with -O0, -O1, or -O2, but not with
-Os.
NOTE 2: The devkitARM toolchain includes a version of MSYS make. Make sure that
the paths to Cygwin's /bin and /usr/bin directories appear BEFORE the devkitARM
path or will get the wrong version of make.
NuttX buildroot Toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^
A GNU GCC-based toolchain is assumed. The PATH environment variable should
be modified to point to the correct path to the ARM toolchain (if
different from the default).
If you have no ARM toolchain, one can be downloaded from the NuttX
Bitbucket download site (https://bitbucket.org/nuttx/buildroot/downloads/).
1. You must have already configured NuttX in <some-dir>nuttx.
tools/configure.sh olimex-strp711:<sub-dir>
2. Download the latest buildroot package into <some-dir>
3. unpack
4. cd <some-dir>/buildroot
5. cp boards/arm-defconfig .config
or
cp boards/arm7tdmi-defconfig-4.3.3 .config (Last tested with this toolchain)
6. make oldconfig
7. make
8. Make sure that the PATH variable includes the path to the newly built
binaries.
Linux OpenOCD with Wiggler JTAG
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
For a debug environment, I am using OpenOCD with a Wiggler-clone JTAG interface. The
following steps worked for me with a 20081028 OpenOCD snapshot.
GENERAL STEPS:
1. Check out OpenOCD
svn checkout svn://svn.berlios.de/openocd/trunk openocd
2. Build OpenOCD
Read the INSTALL file from the files you just downloaded. You probably just need
to run:
./bootstrap
Then configure OpenOCD using the configure script created by ./bootstrap.
./configure --enable-parport
Build OpenOCD with:
make
Install OpenOCD. Since we used the default configuration the code will be
installed at /usr/local/bin/openocd. Other files will be installed at
/usr/local/lib/openocd (configuration files, scripts, etc.) and /usr/local/share/info
(online documentation accessible via 'info openocd'). You need root privileges
to do the following:
make install.
3. Setup
OpenOCD reads its configuration from the file openocd.cfg in the current directory
when started. You have two different options:
* Create a symbolic link named openocd.cfg to one of the configuration files in
/usr/local/lib/openocd, or
* Use a custom configuration file specified with the ‘-f <conf.file>’ command line
switch opeion when starting OpenOCD.
For the STR-P711, I have included bash scripts in the scripts sub-directory.
4. Running OpenOCD
Make sure the ARM7TDMI board is powered and the JTAG cable is connected
Run 'src/openocd -d' (might be required to be root) and check for any errors
reported. The '-d' option enables debugging info.
5. Telnet interface
telnet into port 4444 to get a command interface: 'telnet localhost 4444'
6. GDB
start arm-nuttx-elf-gdb
type 'file <executable.elf>' to load the executable
type 'set debug remote 1' to enable tracing of gdb protocol (if required)
type 'target remote localhost:3333' to connect to the target
The same commands from the telnet interface can now be accessed through the
'monitor' command, e.g. 'monitor help'
Windows OpenOCD will Olimex JTAG
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I have been using the Olimex ARM-USB-OCD JTAG debugger with the STR-P711
(http://www.olimex.com). The OpenOCD configuration file is here:
scripts/oocd_ft2xx.cfg. There is also a script on the scripts/ directory that
I used to start the OpenOCD daemon on my system called oocd.sh. That
script would probably require some modifications to work in another
environment:
- possibly the value of OPENOCD_PATH
- If you are working under Linux you will need to change any
occurrences of `cygpath -w blablabla` to just blablabla
If you have $PATH and other environment variables set up, then you should
be able to start the OpenOCD daemon like:
oocd.sh
To use the Windows Olimex USB JTAG (or 'oocd.sh pp' to use the Wriggler
JTAG) where it is assumed that you are executing oocd.sh from the top level
level NuttX directory.
Once the OpenOCD daemon has been started, you can connect to it via
GDB using the following GDB command:
arm-nuttx-elf-gdb
(gdb) target remote localhost:3333
And you can load the NuttX ELF file into FLASH:
(gdb) load nuttx
(There are also some files in the scripts/ directory that I used to
get OpenOCD working with a Wriggler clone... I never got that stuff
working).
MMC/SD Slot
^^^^^^^^^^^
STR-P711 PIN MMC/SD USAGE PIN CONFIGURATION
------------ ---------------- -----------------------
P0.7/S1.SS 1 CD/DAT3/CS P.07 output
P0.5/S1.MOSI 2 CMD/DI MOSI1
--- 3 VSS1 ---
--- 4 VDD ---
P0.6/S1.SCLK 5 CLK/SCLK SLCK1
--- 6 VSS2 ---
P0.4/S1.MISO 7 DAT0/D0 MISO1
--- 8 DAT1/RES (Pulled up)
--- 9 DAT2/RES (Pulled up)
P1.10/USBCLK 10/14 WP P1.10 input
P1.15/HTXD 13/15 CP P1.15 input
Use of SPI1 doesn't conflict with anything. WP conflicts USB; CP conflicts
with NTXD.
ENC28J60 Module
^^^^^^^^^^^^^^^
The ENC28J60 module does not come on the Olimex-STR-P711, but this describes
how I have connected it. NOTE that the ENC28J60 requires an external interrupt
(XTI) pin. The only easily accessible XTI pins are on SPI0/1 so you can't have
both SPI0 and 1 together with this configuration.
Module CON5 QFN ENC2860 Description
--------------- -------------------------------------------------------
1 J8-1 NET CS 5 ~CS Chip select input pin for SPI interface (active low)
2 2 SCK 4 SCK Clock in pin for SPI interface
3 3 MOSI 3 SI Data in pin for SPI interface
4 4 MISO 2 SO Data out pin for SPI interface
5 5 GND -- --- ---
10 J9-1 3V3 -- --- ---
9 2 WOL 1 ~WOL Unicast WOL filter
8 3 NET INT 28 ~INT Interrupt output pin (active low)
7 4 CLKOUT 27 CLKOUT Programmable clock output pin
6 5 NET RST 6 ~RESET Active-low device Reset input
For the Olimex STR-P711, the ENC28J60 module is placed on SPI0 and uses
P0.3 for CS, P0.6 for an interrupt, and P0.4 as a reset:
Module CON5 Olimex STR-P711 Connection
--------------- -------------------------------------------------------
1 J8-1 NET CS SPI0-2 P0.3 output P0.3/S0.SS/I1.SDA
2 2 SCK SPI0-5 SCLK0 P0.2/S0.SCLK/I1.SCL
3 3 MOSI SPI0-3 MOSI0 P0.0/S0.MOSI/U3.RX
4 4 MISO SPI0-4 MISO0 P0.1/S0.MISO/U3.TX
5 5 GND SPI0-1 GND
10 J9-1 3V3 SPI0-6 3.3V
9 2 WOL NC
8 3 NET INT SPI1-5 P0.6 XTI 11 P0.6/S1.SCLK
7 4 CLKOUT NC
6 5 NET RST SPI1-4 P0.4 output P0.4/S1.MISO
UART3, I2C cannot be used with SPI0. The GPIOs selected for the ENC28J60
interrupt conflict with TIM1.
NOTE: As of this writing, the ENC28J60 does not function on the board.
The board just locks up when the ENC29J60 is powered. Most likely,
in sufficient current is provided via USB to power both the board and
the ENC28J60 (And I don't have the correct wall wart to power the
the board).
Common Configuration Notes:
---------------------------
1. Each Olimex STRP711 configuration is maintained in a sub-directory and
can be selected as follow:
tools/configure.sh olimex-strp711:<subdir>
Where <subdir> is one of the configuration sub-directories described in
the following paragraph.
2. These configurations use the mconf-based configuration tool. To
change a configurations using that tool, you should:
a. Build and install the kconfig-mconf tool. See nuttx/README.txt
see additional README.txt files in the NuttX tools repository.
b. Execute 'make menuconfig' in nuttx/ in order to start the
reconfiguration process.
3. By default, all configurations assume the NuttX Buildroot toolchain
under Linux (should work under Windows with Cygwin as well). This
is easily reconfigured:
CONFIG_HOST_LINUX=y
CONFIG_ARM_TOOLCHAIN_BUILDROOT=y
Configuration Sub-Directories:
------------------------------
nettest:
This configuration directory may be used to enable networking using the
an Microchip ENC28J60 SPI Ethernet module (see above for connection to
STR-P711).
nsh:
Configures the NuttShell (nsh) located at examples/nsh. The
Configuration enables both the serial and telnetd NSH interfaces.
STR71x-Specific Configuration Settings
--------------------------------------
CONFIG_STR71X_I2C0, CONFIG_STR71X_I2C1, CONFIG_STR71X_UART0, CONFIG_STR71X_UART1,
CONFIG_STR71X_UART2, CONFIG_STR71X_UART3, CONFIG_STR71X_USB, CONFIG_STR71X_CAN,
CONFIG_STR71X_BSPI0, CONFIG_STR71X_BSPI1, CONFIG_STR71X_HDLC, CONFIG_STR71X_XTI,
CONFIG_STR71X_GPIO0, CONFIG_STR71X_GPIO1, CONFIG_STR71X_GPIO2, CONFIG_STR71X_ADC12,
CONFIG_STR71X_CKOUT, CONFIG_STR71X_TIM1, CONFIG_STR71X_TIM2, CONFIG_STR71X_TIM3, and
CONFIG_STR71X_RTC
Select peripherals to initialize (Timer0 and EIC are always initialized)
CONFIG_UART_PRI, STR71X_BSPI_PRI, CONFIG_TIM_PRI, CONFIG_USB_PRI
Can be defined to set the priority of NuttX managed devices. Default is 1.
CONFIG_STR71X_BANK0, CONFIG_STR71X_BANK1, CONFIG_STR71X_BANK2, and CONFIG_STR71X_BANK3
Enable initialize of external memory banks 0-3.
CONFIG_STR71X_BANK0_SIZE, CONFIG_STR71X_BANK1_SIZE, CONFIG_STR71X_BANK2_SIZE, and
CONFIG_STR71X_BANK3_SIZE
If a particular external memory bank is configured, then its width must be provided.
8 and 16 (bits) are the only valid options.
CONFIG_STR71X_BANK0_WAITSTATES, CONFIG_STR71X_BANK1_WAITSTATES,
CONFIG_STR71X_BANK2_WAITSTATES, and CONFIG_STR71X_BANK3_WAITSTATES
If a particular external memory bank is configured, then the number of waistates
for the bank must also be provided. Valid options are {0, .., 15}
CONFIG_STR71X_BIGEXTMEM
The default is to provide 20 bits of address for all external memory regions. If
any memory region is larger than 1Mb, then this option should be selected. In this
case, 24 bits of addressing will be used
CONFIG_UARTn_SERIAL_CONSOLE - selects the UARTn for the
console and ttys0 (default is the UART0).
CONFIG_UARTn_RXBUFSIZE - Characters are buffered as received.
This specific the size of the receive buffer
CONFIG_UARTn_TXBUFSIZE - Characters are buffered before
being sent. This specific the size of the transmit buffer
CONFIG_UARTn_BAUD - The configure BAUD of the UART. Must be
CONFIG_UARTn_BITS - The number of bits. Must be either 7 or 8.
CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity, 3=mark 1, 4=space 0
CONFIG_UARTn_2STOP - Two stop bits
25eb09c3bb