Introduction

Coremark is a cross-platform CPU benchmark tool. I would like to create a Linux boot floppy disk that would boot on a real Intel 80386 machine and then run the coremark. It should support 80386SX with as little as ~8MB of RAM.

** WARNING **: The method described here is tested and failed to work on real machines / 86box. This project is not considered as done, and may be revisited in the future.

Buildroot

The buildroot is used to compile the gcc 5 that will be used to compile the kernel and the coremark. Linux distribution offered compiler doesn't quite work here because:

1. We are stuck with Linux 3.2.102 if 386 support is necessary. Linux 3.2 can only be built with gcc 3-5 by default.
2. The libc bundled with distribution compiler is unlikely to target i386. This cause issues when trying to link them statically into the build.

Buildroot Config

The last buildroot version that supports 386 is the 2016.02 version. Download, extract and run make menuconfig.

Set target architecture to i386, and target machine to 386. Set gcc version to 5.x. In bootloaders, select syslinux, image to install is mbr.

Buildroot Patch

There are several patches that is required to build the system correctly, apply them to the buildroot.

本文大概就是随便记录下调试过程中遇到的问题。考虑到iMX6还是相当好用的芯片，很有可能也不是最后一次用iMX6，那就姑且记录下，方便自己以后参考吧。

摄像头I2C

不知道为什么，iMX6的I2C拒绝和我的摄像头通信，示波器观察的话摄像头已经给了ACK，但是iMX6没有继续传输数据。好在Linux下使用软件I2C非常简单，只需要选中i2c-gpio驱动并且简单修改设备树即可。

i2c@0 {
	compatible = "i2c-gpio";
	gpios = <&gpio1 29 0
		 &gpio1 28 0>;
	#address-cells = <1>;
	#size-cells = <0>;

	mt9m: mt9m@5d {
		compatible = "mt9m";
		reg = <0x5d>;
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_csi1>;
		clocks = <&clks IMX6UL_CLK_CSI>;
		clock-names = "csi_mclk";
		csi_id = <0>;
		mclk = <20000000>;
		mclk_source = <0>;
		status = "okay";
		port {
			mt9m_ep: endpoint {
				remote-endpoint = <&csi1_ep>;
			};
		};
	};
};

gbatemp首发，直接复制原文内容了，懒得翻译回中文了orz

简介

本文内容仅供存档说明，代码基本已经migrate进nop90的SDL移植，开发用途建议使用nop90的移植

前言

About the game

XianJian QiXia Zhuan 仙劍奇俠傳 (also known as The Legend of Sword and Fairy and “PAL”) is an action RPG created by Taiwan’s Softstar Entertainment Inc. The game is considered by many as simply one of the best Chinese RPG ever created. Since its first release in 1995 (DOS Version), many new versions and sequels (including a prequel) were created. However, none could replace the breath-taking and tragic tale it was born from. Here, we meet our protagonist Li Xiaoyao; an aspiring martial artist and the lovely Zhao Ling’er, a charismatic Nuwa descendant.​