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Update README files

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This commit is contained in:
Gregory Nutt 2016-01-07 07:50:46 -06:00
parent 879d43a584
commit a232ccc3ab
3 changed files with 58 additions and 12 deletions
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36
configs/arduino-mega2560/README.txt
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@ -1,22 +1,38 @@
README
^^^^^
This is the README file for the port of NuttX to the Arduino Mega 2560 Rev3.
This is the README file for the port of NuttX to the Arduino Mega 2560 Rev3.
https://www.arduino.cc/en/Main/ArduinoBoardMega2560
https://www.arduino.cc/en/Main/ArduinoBoardMega2560
The board is based on ATMega2560 chip from Atmel
http://www.atmel.com/devices/atmega2560.aspx
The board is based on ATMega2560 chip from Atmel
http://www.atmel.com/devices/atmega2560.aspx
Toolchain
^^^^^^^^^
Right now only Atmel's AVR8 Toolchain is supported. You can get it from
Right now only Atmel's AVR8 Toolchain is supported. You can get it from
http://www.atmel.com/tools/atmelavrtoolchainforwindows.aspx
http://www.atmel.com/tools/atmelavrtoolchainforwindows.aspx
It is basically WinAVR compatible so sub-projects may define WinAVR as a
tool-chain but specify path to the Atmel AVR8 in path. See
arduino-mega2560/hello for example.
It is basically WinAVR compatible so sub-projects may define WinAVR as a
tool-chain but specify path to the Atmel AVR8 in path. See
arduino-mega2560/hello for example.
MEMX
^^^^
If you use the GCC AVR toolchain from the Atmel Studio, then you can
enable suppport for the MEMX storage:
CONFIG_AVR_HAS_MEMX_PTR=y
If this support is enabled, then all strings will be saved in FLASH and
standard string-oriented interfaces such printf() will change so that
they accept memx pointers.
This means that (1) ALL strings must lie in FLASH, and (2) since the
strings are moved from SRAM to FLASH, you will save a LOT of SRAM usage
in some configurations that use a lot of string memory (such as the
ostest and nsh configurations).

16
configs/arduino-mega2560/hello/Make.defs
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@ -37,6 +37,12 @@ include ${TOPDIR}/.config
include ${TOPDIR}/tools/Config.mk
include ${TOPDIR}/arch/avr/src/avr/Toolchain.defs
ifeq ($(CONFIG_AVR_HAS_MEMX_PTR),y)
LDSCRIPT = memx.ld
else
LDSCRIPT = nomemx.ld
endif
ifeq ($(WINTOOL),y)
# Windows-native toolchains
DIRLINK = $(TOPDIR)/tools/copydir.sh
@ -44,13 +50,13 @@ ifeq ($(WINTOOL),y)
MKDEP = $(TOPDIR)/tools/mknulldeps.sh
ARCHINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}"
ARCHXXINCLUDES = $(ARCHINCLUDES) "${shell cygpath -w $(TOPDIR)/include/cxx}"
ARCHSCRIPT = -T "${shell cygpath -w $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/nomemx.ld}"
ARCHSCRIPT = -T "${shell cygpath -w $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/$(LDSCRIPT)}"
else
# Linux/Cygwin-native toolchain
MKDEP = $(TOPDIR)/tools/mkdeps.sh
ARCHINCLUDES = -I. -isystem "$(TOPDIR)/include"
ARCHXXINCLUDES = $(ARCHINCLUDES) -isystem "$(TOPDIR)/include/cxx"
ARCHSCRIPT = -T$(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/nomemx.ld
ARCHSCRIPT = -T$(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/$(LDSCRIPT)
endif
CC = $(CROSSDEV)gcc
@ -72,6 +78,12 @@ endif
ARCHCFLAGS = -fno-builtin
ARCHCXXFLAGS = -fno-builtin -fno-exceptions
ifeq ($(CONFIG_AVR_HAS_MEMX_PTR),y)
ARCHCFLAGS += -fdata-sections
ARCHCXXFLAGS += -fdata-sections
endif
ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
ARCHWARNINGSXX = -Wall -Wshadow -Wundef
ARCHDEFINES =

18
configs/teensy-2.0/README.txt
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@ -17,6 +17,7 @@ Contents
o Windows Native Toolchains
o NuttX buildroot Toolchain
o avr-libc
o MEMX
o Teensy++ Configuration Options
o Configurations
@ -387,6 +388,23 @@ Build Notes:
make install
MEMX
^^^^
If you use the GCC AVR toolchain from the Atmel Studio, then you can
enable suppport for the MEMX storage:
CONFIG_AVR_HAS_MEMX_PTR=y
If this support is enabled, then all strings will be saved in FLASH and
standard string-oriented interfaces such printf() will change so that
they accept memx pointers.
This means that (1) ALL strings must lie in FLASH, and (2) since the
strings are moved from SRAM to FLASH, you will save a LOT of SRAM usage
in some configurations that use a lot of string memory (such as the
ostest and nsh configurations).
Teensy++ Configuration Options
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^