Welcome to tyron's blog
常将有日思无日，莫把无时当有时-
linux patch补丁文件格式说明
*.patch文件
diff -rBNu src.orig/java/org/apache/nutch/analysis/NutchAnalysisConstants.java src/java/org/apache/nutch/analysis/NutchAnalysisConstants.java --- src.orig/java/org/apache/nutch/analysis/NutchAnalysisConstants.java 2009-03-10 11:34:01.000000000 -0700 +++ src/java/org/apache/nutch/analysis/NutchAnalysisConstants.java 2009-03-10 14:11:55.000000000 -0700 @@ -4,9 +4,12 @@ + int CJK = 21; + int DIGIT = 22; int DEFAULT = 0; String[] tokenImage = { "<EOF>", + "\"OR\"", "<WORD>", "<ACRONYM>", "<SIGRAM>", @@ -39,6 +42,8 @@ "\"\\\"\"", "\":\"", "\"/\"", + "\"(\"", + "\")\"", "\".\"", "\"@\"", "\"\\\'\"",\patch文件的结构
- — vs +++
—开头表示旧文件，
+++开头表示新文件。
一个补丁文件中的多个补丁 一个补丁文件中可能包含以—/+++开头的很多节，每一节用来打一个补丁。所以在一个补丁文件中可以包含好多个补丁。
- @@
块是补丁中要修改的地方。它通常由一部分不用修改的东西开始和结束。他们只是用来表示要修改的位置。他们通常以@@开始，结束于另一个块的开始或者一个新的补丁头。
- - vs +
块会缩进一列，而这一列是用来表示这一行是要增加还是要删除的。 块的第一列
+号表示这一行是要加上的。
-号表示这一行是要删除的。
没有加号也没有减号表示这里只是引用的而不需要修改。
- @@ -4,9 +4,12
@@ -4,9 +4,12 旧文件从4行开始，共9行；新文件从4行开始，共12行 无+—符号，是引用的内容
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u-boot command lists
? - alias for ‘help’
avb - Provides commands for testing Android Verified Boot 2.0 functionality
base - print or set address offset
bdinfo - print Board Info structure
blkcache- block cache diagnostics and control
boot - boot default, i.e., run ‘bootcmd’
boota - boot Android Image from mmc
bootd - boot default, i.e., run ‘bootcmd’
bootefi - Boots an EFI payload from memory
bootelf - Boot from an ELF image in memory
booti - boot arm64 Linux Image image from memory
bootm - boot application image from memory
bootp - boot image via network using BOOTP/TFTP protocol
bootvx - Boot vxWorks from an ELF image
bootz - boot Linux zImage image from memory
cmp - memory compare
coninfo - print console devices and information
cp - memory copy
crc32 - checksum calculation
dcache - enable or disable data cache
dhcp - boot image via network using DHCP/TFTP protocol
dm - Driver model low level access
dtboinfo- dtboinfo [a b] echo - echo args to console
editenv - edit environment variable
env - environment handling commands
erase - erase FLASH memory
exit - exit script
ext2load- load binary file from a Ext2 filesystem
ext2ls - list files in a directory (default /)
ext4load- load binary file from a Ext4 filesystem
ext4ls - list files in a directory (default /)
ext4size- determine a file’s size
ext4write- create a file in the root directory
false - do nothing, unsuccessfully
fastboot- run as a fastboot usb or udp device
fatinfo - print information about filesystem
fatload - load binary file from a dos filesystem
fatls - list files in a directory (default /)
fatsize - determine a file’s size
fatwrite- write file into a dos filesystem
fdt - flattened device tree utility commands
flinfo - print FLASH memory information
fstype - Look up a filesystem type
fsuuid - Look up a filesystem UUID
go - start application at address ‘addr’
gpio - query and control gpio pins
gpt - GUID Partition Table
guid - GUID - generate Globally Unique Identifier based on random UUID
gzwrite - unzip and write memory to block device
help - print command description/usage
i2c - I2C sub-system
icache - enable or disable instruction cache
iminfo - print header information for application image
imxtract- extract a part of a multi-image
itest - return true/false on integer compare
load - load binary file from a filesystem
loadb - load binary file over serial line (kermit mode)
loads - load S-Record file over serial line
loadx - load binary file over serial line (xmodem mode)
loady - load binary file over serial line (ymodem mode)
loop - infinite loop on address range
ls - list files in a directory (default /)
lzmadec - lzma uncompress a memory region
md - memory display
mdio - MDIO utility commands
mii - MII utility commands
mm - memory modify (auto-incrementing address)
mmc - MMC sub system, mmc command
mmcinfo - display MMC info
mw - memory write (fill)
nfs - boot image via network using NFS protocol
nm - memory modify (constant address)
ping - send ICMP ECHO_REQUEST to network host
printenv- print environment variables
protect - enable or disable FLASH write protection
reset - Perform RESET of the CPU
run - run commands in an environment variable
save - save file to a filesystem
saveenv - save environment variables to persistent storage
setenv - set environment variables
setexpr - set environment variable as the result of eval expression
showvar - print local hushshell variables
size - determine a file’s size
sleep - delay execution for some time
source - run script from memory
test - minimal test like /bin/sh
tftpboot- boot image via network using TFTP protocol
true - do nothing, successfully
unzip - unzip a memory region
usb - USB sub-system
usbboot - boot from USB device
uuid - UUID - generate random Universally Unique Identifier
version - print monitor, compiler and linker version
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CNN（Convolution Neural Networks）基本概念
基本概念
下面这篇文章详细介绍了CNN中的几个基本概念：
A guide to convolution arithmetic for deep learning (BibTeX)
影响CNN output size的几个因素
- ij: input size along axis j,
- kj: kernel size along axis j,
- sj: stride (distance between two consecutive positions of the kernel) along axis j,
- pj: zero padding (number of zeros concatenated at the beginning and at the end of an axis) along axis j.
ij = 5
kj = 3
sj = 2
pj = 1
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功能安全Functional Safety/ISO 26262
功能安全生命周期（lifecycle）三阶段
功能安全，贯穿从设计前/设计中/设计后三个阶段。
功能安全分级（ISO26262 vs IEC61508）
可以看到，在SIL2/ASIL B-C，最多会有一人死亡。
MCU vs Functional Safety
可以看到，设计MCU/CPU，要想加入功能安全属性，像memory，bus，clock，voltage,peripherals这些地方，需要很多工作要做的，如memory中的ECC/Parity校验，均是功能安全要求的。
功能安全V形结构
可以看到，从设计目标，设计实现，到结果验证，呈现出一个V形架构。
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shell中的注释
- 单行注释
在行首用符号“#”。
- 多行注释
有多种方法，比较喜欢以下这种方法：
:<<! ...... !例：
... # Tarballs provided with the PoC ### comment for debug :<<! # CR7 loade tar xf ${PKG_RELEASE}/src/cr7-loader/cr7-loader*.tar.gz -C ./ mv cr7-loader* cr7-loader # CR7 vlib tar xf ${PKG_RELEASE}/src/cr7-vlib/cr7-vlib*.tar.gz -C ./ mv cr7-vlib* cr7-vlib ! # Git repos plus patches ...
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linux下readlink函数解释
定义函数：int readlink(const char *path, char *buf, size_t bufsiz); 函数说明：readlink()会将参数path的符号连接内容到参数buf所指的内存空间。若参数bufsiz小于符号连接的内容长度，过长的内容会被截断
返回值：执行成功则传符号连接所指的文件路径字符串，失败返回-1， 错误代码存于errno。
例二:
#include <stdio.h> #include <unistd.h> char * get_exe_path( char * buf, int count) { int i; int rslt = readlink("/proc/self/exe", buf, count - 1); if (rslt < 0 || (rslt >= count - 1)) { return NULL; } buf[rslt] = '\0'; for (i = rslt; i >= 0; i--) { printf("buf[%d] %c\n", i, buf[i]); if (buf[i] == '/') { buf[i + 1] = '\0'; break; } } return buf; } int main(int argc, char ** argv) { char path[1024]; printf("%s\n", get_exe_path(path, 1024)); return 0; }