ARM calls FIQ the fast interrupt, with the implication that IRQ is normal priority. In any real system, there will be many more sources of interrupts than just two devices and there will therefore be some external hardware interrupt controller which allows masking, prioritization etc. of these multiple sources and which drives the interrupt request lines to the processor.
To some extent, this makes the distinction between the two interrupt modes redundant and many systems do not use nFIQ at all, or use it in a way analogous to the non-maskable (NMI) interrupt found on other processors (although FIQ is software maskable on most ARM processors).
$ vim test.c
#include <stdio.h>
int main(void)
{
int i;
for(i=0;i<10;i++)
printf("%d \n\r",i);
printf("----------");
for(i=0;i<10;++i)
printf("%d \n\r",i);
return;
}
编辑完毕后，shift+: wq 保存退出。
$ gcc test.c -o test
$ ./test
0
1
2
3
4
5
6
7
8
9
----------
0
1
2
3
4
5
6
7
8
9
// 一位工程师写的示例代码
// 向这位工程师致敬！
//
int a = 0; //全局初始化区
int a = 0; //全局初始化区
char *p1; //全局未初始化区
main() {
int b; //栈
char s[] = "abc"; //栈
char *p2; //栈
char *p3 = "123456"; //123456\0在常量区，p3在栈上。
static int c = 0; //全局（静态）初始化区
p1 = (char *)malloc(10);
p2 = (char *)malloc(20);
//分配得来得10和20字节的区域就在堆区。
strcpy(p1, "123456"); //123456\0放在常量区，编译器可能会将它与p3所指向的"123456"优化成一个地方。
}
1 板子通过usb2uart连接到ubuntu虚拟机（可移动设备名称为：Google Salxxxxxx）。
并启动android。
2 虚拟机上首先要安装VMware Tools（否则，会看不到共享文件夹）。
3 启用windows下共享文件夹、
(1)要传输的文件，例如，test.txt
(2)android img文件夹——含adb命令
以上两者均位于该共享文件夹。
1 虚拟机上，进入终端，并进入上述共享文件夹下，或软连接目录。
2 shell下，
$ ./adb root
restarting adbd as root
$ ./adb shell （可以进入板上目录）
salvator:/ # ls
acct dev init.zygote64_32.rc sdcard
bin etc lost+found storage
bugreports init mnt sys
cache init.environ.rc odm system
charger init.rc oem ueventd.rc
config init.recovery.salvator.rc postinstall vendor
d init.usb.configfs.rc proc
data init.usb.rc product
default.prop init.zygote32.rc sbin
salvator:/sdcard/Movies # exit
$ ./adb push /home/titron/test.txt /sdcard/Download
$ ./adb push /home/m3n_imgs/aaa.mp3 /data/media/0/Download
$ ./adb push /home/m3n_imgs/bbb.apk /data/media/0/Download
# 说明：
# 推送到/data/media/0/Download，
# 相当于推送到/sdcard/Download
#
# "/data/media/0"是安卓手机内置存储的真实目录，
# 而"/sdcard"是内置存储被安卓系统挂载的快捷方式（指向"/data/media/0"）；
# 通常需要存储空间权限的手机app会访问后者，前者需要ROOT权限才能访问，因此这两个文件夹是一个目录
# 有关android内部存储和外部存储，请参看下面的附录连接。
附录：
Mini-Monitor for Third-Generation R-Car Products command Lists：
D - memory Dump
DM - set&disp Dump Mode
F - Fill memory
FL - Fill memory(Long)
FX - Fill memory(Long Long)
M - set Memory(byte)
MW - set Memory(Word)
ML - set Memory(Long)
MX - set Memory(Long Long)
MV - Move memory
RAMCK - RAM read write Check
DDRCK - DDR Memory read write Check
DDRCK_8GB - DDR Memory read write ChecK_8Gbyte
L - load program
G - Go program
LF - load Program to Flash memory
CF - Clear Flash memory
XLS - Load program to SpiFlash or HyperFlash
XLS2 - SpiFlash or HyperFlash address input version of XLS command
XCS - Clear SpiFlash or HyperFlash
XINFO - read SA3 Information
XINFO_S - set SA3 Information
XINFO_SA0 - read SA0 Information
XINFO_SA0_S - set SA0 Information
SUP - Scif speed UP
READ_PMIC - read PMIC Firmware from EEPROM
SET_PMIC - set PMIC Firmware to EEPROM
SET_IIC0 - set IIC0 Slave Address
IIC0_M - set IIC0 memory(BYTE)
SET_I2C0 - set I2C0 Slave Address
I2C0_M - set I2C0 memory(BYTE)
H - Help