* [bsp][sconscript] 整理统一sconscript格式

* update

* update

* bsp beaglebone: add IAR template files and fix it's build error

ATTENTION:
project.* was generated by scons, so I add it to gitignore.
rtconfig.py *FLAGS located in "PLATFORM == 'iccarm'" are unverified and maybe wrong.
（我只是从STM32里面抄来，然后根据自己的理解改了一下，并没有验证这些参数的正确性，
我也不知道怎么用命令行调用这些参数来编译）

* bsp beaglebone: add beaglebone_ram.icf ROM address from uboot_cmd.txt

am335x_DDR.icf use 0x82000000, different to uboot_cmd.txt & gcc beaglebone_ram.lds,
the difference will easy cause later developer got below error:

=> go 0x80200000
## Starting application at 0x80200000 ...
undefined instruction
pc : [<8200956c>]	   lr : [<8ff62497>]
reloc pc : [<728a956c>]	   lr : [<80802497>]
sp : 8df37358  ip : 00000000	 fp : 00000002
r10: 8df4d448  r9 : 8df3feb8	 r8 : 8ffd30f8
r7 : 8ff78089  r6 : 00000002	 r5 : 80200000  r4 : 8df4d44c
r3 : 80200000  r2 : 8df4d44c	 r1 : 8df4d44c  r0 : 00000001
Flags: nzCv  IRQs off  FIQs on  Mode SVC_32
Code: 5dbffcdd bb9bdf7f abf85423 eff1f77f (7ed7daaf)
Resetting CPU ...

resetting ...

* libcpu am335x: context_iar.S rt_hw_context_switch: add thumb mode support

IAR new project defualt Processor mode is Thumb, this will cause user
easy occur the following error:
...
msh />Execption:
r00:0x8800aaa8 r01:0x802080c5 r02:0x00000000 r03:0x88009b4c
r04:0x00001000 r05:0x00000000 r06:0x00001403 r07:0x00100000
r08:0x00000000 r09:0x00000000 r10:0x0000000a
fp :0x0000000a ip :0x65687374
sp :0x00006c6c lr :0x0000008a pc :0x88008be0
cpsr:0x880001bc
software interrupt
shutdown...
(0) assertion failed at function:rt_hw_cpu_shutdown, line number:160

* bsp beaglebone: change IAR template.ewp code use Arm mode

Arm mode bin size will bigger than Thumb mode

* libcpu am335x: IAR: use rt_hw_cpu_dcache_enable instead of rt_cpu_dcache_enable

Reviewer mysterywolf say:
麻烦把rt_cpu_icache_enable 和 rt_cpu_dcache_enable, 统一改成 rt_hw_cpu_icache_enable 和 rt_hw_cpu_dcache_enable
rt_hw_cpu_icache_enable 和 rt_hw_cpu_dcache_enable 是其他bsp也是这么命名的 这是个命名统一的函数

* bsp beaglebone: rerun menuconfg

* bsp beaglebone: add uart0 support

* bsp beaglebone: use uart0 as console

* bsp beaglebone: add heap init

fix rt_application_init() error:
(m != RT_NULL) assertion failed at function:rt_smem_alloc, line number:288

* bsp beaglebone: add mmu & interrupt init

must init mmu, otherwise no interrupt is generated, cause scheduler can't work.
I don't know why need mmu, just seen: bsp/rockchip/rk3568/driver/board.c

* libcpu am335x: reset interrupt controller before init vector

I think reset before init is more better

AM335X_StarterWare_02_00_01_01\system_config\armv7a\am335x\interrupt.c
IntAINTCInit()

* bsp beaglebone: full gpio driver support

* bsp beaglebone: add tftpboot way to uboot_cmd.txt

* bsp beaglebone: optimize am33xx_gpio_hdr, check irqstatus is the last one
Co-authored-by: YangZhongQing <vipox@qq.com>

1. SConstruct中增加对C++支持
2. 重新menuconfig. 删除application.c/startup.c,增加main.c. 以便通过编译

This reverts commit a966dd3c.

This reverts commit 9cdf989c. The timer
has been initialized already.

It could fix the problem encountered in
https://groups.google.com/forum/?hl=en#!topic/rt-thread-cnusers/tpqZOMsIp8I

With new timer algorithm, timer should be initialized during startup. So
add them to the bsps. Use these commands to get which bsp is missing
calling the function:

    % git grep rt_system_timer_init bsp|sed -n 's|bsp/\([^/]*\).*|\1|p' | sort | uniq > have_tm_init
    % ls -1 bsp |sed -n 's|\([^/]*\).*|\1|p' | sort > all_bsp
    % comm -3 all_bsp have_tm_init
    beaglebone
    lpc176x
    lpc178x
    ls1bdev
    mb9bf506r
    stm32f10x
    xplorer4330