Lincoln Wallace locnnil

BOOT MODE: NAND
ddr init

U-Boot 2013.04 (Oct 11 2016 - 11:22:42)

CPU:   Cortex-A9 400 MHz
AHB:   100 MHz
APB:   50 MHz

How to compile statically linked OpenVPN client for ARMv5

You need to install ARMv5 gcc cross compiler: apt-get install gcc-arm-linux-gnueabi

You have to define a directory (via --prefix) where all of your binaries will be installed (copied). In the guide I use the following: /home/user/vpn_compile

OpenSSL

Download the source: wget https://www.openssl.org/source/openssl-1.0.2j.tar.gz

Calculate the necessary CRC type

Beeing B the number of bytes of your message the necessary numbers necessary in your CRC gonna be:

N >= ln(8*B+1)/ln(2) -1

This formula cames from the manipulation of the formula B = (2**(N+1) -1)/8

OBS: rembering that only exists CRC8, CRC16 and CRC32 (until now)

The size of a Array in C

Using sizeof:

int a[17];
size_t n = sizeof(a) / sizeof(a[0]);

Using a Macro function

#define NELEMS(x) (sizeof(x) / sizeof((x)[0]))

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

	cmake_minimum_required(VERSION 3.22)

	SET(CMAKE_C_STANDARD 11)
	SET(CMAKE_CXX_STANDARD 20)

	project(template)

	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unused-variable -Werror -Wfatal-errors ")
	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wno-unused-variable -Werror -Wfatal-errors")

	# CMake toolchain file for building ARM software on OI environment

	# Processor
	SET(CMAKE_SYSTEM_PROCESSOR arm)
	# this one is important
	SET(CMAKE_SYSTEM_NAME Linux)
	#this one not so much
	SET(CMAKE_SYSTEM_VERSION 1)

	# (OPTIONAL) specify some CPU flags

	cmake-3.19.4/*
	##### Windows
	# Windows thumbnail cache files
	Thumbs.db
	Thumbs.db:encryptable
	ehthumbs.db
	ehthumbs_vista.db

	# Dump file
	*.stackdump