STM32F4系列UART在初始化的时候，如果GPIO_AF放到GPIO_INIT后边，系统复位后，串口会向外发送一个字节的数据，通常是0x00。将GPIO_AF放到GPIO_INIT前边可以避开这个问题。

Add RT_USED definition for IAR

[BSP] Add EMAC driver in loongson1C (ported by chinesebear, https://github.com/chinesebear/rtt-net)

[libcpu] update cortex-m libcpu: fixed compile error.

x86: bring up share object module on i386 machine

1. upddate kernel module to support i386
2. update libdl to support open *.so by absolute path
3. new test case bsp/x86/src/hello.c to test i386 module feature
Signed-off-by: Nparai <parai@foxmail.com>

[lwIP] Fix LwIP 2.0.2 tftp

[Device Drivers] delete an useless %s.

Fix ibc armlibc

[bsp] x86 : fix keyboard input issue

[lwIP] Fix netutils

Signed-off-by: NParai Wang <parai@foxmail.com>

[libcpu] Update cortex m port

[BSP] x86: add floppy driver

Revert "x86: keyboad input bug fix"

[LWIP] Update LwIP 2.0.2 opts header file for rtt.

Fix lwip 2.0.2 TFTP server

currently only read okay, write is not supported, this is enough for
me to study ELF, but the floppy is really small, now only about 400kb
space free showed by df("/").
Signed-off-by: Nparai <parai@foxmail.com>