a20 processor

82360SL 8 The amd Elan sc400 docs (21032.pdf) say: Register eeh can be used to cause the same type of masking of the CPU A20 signal that was historically timed med by an external SCP (System Control Processor) in a PC/AT compatible system, but much faster. this control defaults to not forcing the propagation of A20: dummy READ = returns FFH,

The 20th IP address lines of the PC and Its compatible hosts are special. in computer systems, a "door" is usually arranged to control whether the IP address line is valid. To access a storage unit larger than 1 MB, open the A20 portal ". This setting is related to the use of only the low-end 1 Mbit/s bucket in real mode. It is related to whether the processor is working in real mode or the protection mode.

From: http://blog.csdn.net/allen6268198/article/details/12905425A10/A20 bootloader loading Process AnalysisNote: as the A10 and A20 in the loading bootloader process is basically consistent, the following only A20 narrative, but also applicable to A10. In addition, in the case of no need to distinguish between Cubieboard1 and CUBIEBOARD2, collectively referred to

Why does the A20 address line need to be enabled when the real mode is switched to the protection mode (compatibility issues caused by system upgrades) [-1] preface: Complementary: Compatibility refers to the CPU running in the early stage. For example, a program running on 8086/8088 can also run on a later processor, such as 80286; [0] Look at the development history of intel processors The system does no

"-1" written in front:The following section summarizes the Http://blog.csdn.net/ruyanhai/article/details/7181842complementary: compatibility refers to programs that run on the previous CPU, such as 8086/8088, can also be run on its later processors, such as 80286;"0" look at the Intel processor development processaddressing and issues for "1" 8086/80881.1) Addressing:In 8086/8088, there are only 20 address bus, so the address that can be accessed is 2

We mentioned in the previous article, how to make bootsect, of course, people are always greedy, production finished bootsect and think about doing setup, Setup main work is to open A20, enter the protection mode, and so on.I. Introduction of A20This is a historic issue, in Intel processor 8086, "segment: Offset" Maximum can represent the memory address is ffff:ffff, that is, 10FFEFh, but 8,086 only 20-bit

Cubie This development board has been purchased for more than a year, has no time to play, recently feel that they have no progress, want to learn something more, rummaging finally find out. Crap not much.1. Source code Download Path methodTwo download methods, I was directly to the Cubie Baidu network disk download, the network to share code and reference material or very full.1) Download on GitHubgit clone https://bitbucket.org/cubietech/a20-android

Humming Bird A20 SPI2 using compilationYao.guet 2014-07-17, please specify the source:Http://blog.csdn.net/Yao_GUETThe A20 has 4 SPI interfaces, because humming Bird A20 only leads to SPI2, so here's an example of Spi2. See how the Fex file is set.Because I get the Linux kernel is already has the Spi-sun7i drive code file. People democracy so without the code of

Quanzhi Allwinner A20 set-top box is flushed into Native Debian Spent 60 oceans to purchase a tianmin TV genie 3 Android set-top box. The purpose of the purchase is to refresh the native Debian or other release versions. View the specific hardware: quanzhi Allwinner A20 dual-core CPU, Cortex-A7 architecture; Memory 1G; flash 4G; Two USB, one HDMI, one AV. After reading the Sunxi Wiki, we found that we can u

This tutorial is suitable for the development Board of the A20 system class.My A20 board is using the Rtl8188eu Usb-wifi, it took three days to drive successfully, successfully connected to the router with WiFi, and ping through www.baidu.com.Note:Operating system: Linux-sunxi (not Android)1. See if the 8188eu driver is supported in the kernelOpen Linux-sunxi/arch/arm/configs/sun7i_defconfig FileSee if: Con

http://blog.csdn.net/wb4916/article/details/78031511BPI-M1P (full chi A20) brush Android Boot card after starting the processBPI-M1P (full chi A20) brush Android Boot card after starting the process2017/9/19 16:481. Insert the 16GB class-10 TF (minimum 8GB) card into the Win7 computer after inserting it into the card reader.2, through the tool apst download: Card production tool PhoenixCardV4.1.1 there is n

This article was reproduced from: http://blog.csdn.net/u011258134/article/details/50749174How to let a20,android boot automatically start C program2014-12-26 11:32 557 people read comments (3) favorite reports Classification:C language Learning (Ten)Author of similar articlesXCopyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.Xinit added: xinit/usr/local/bin/xfreerdp 192.168.1.1961, modify And

ZookeeperChapter 2 PrefaceYou need to implement the infrared remote control on Raspberry Pi 3 (A20) android system. Because super3 has an infrared receiver, you can directly support the infrared remote control and apply Raspberry Pi 3 to home control. Used as a network set-top boxRaspberry Pi 3's infrared remote control also has the mouse function, that is, some mouse functions that can be replaced by it, because some software does not support pure re

:5/5 Signal level:-45 dbm Noise level:-92 dbmEncryption Key:offBit rates:1 mb/s; 2 MB/s; 5.5 MB/s; MB/s; MB/sMB/s; -MB/s; * MB/s; 6 MB/s; 9 MB/sMB/s; MB/s5. Use the command #iwconfig wlan0 Essid "HW AP" to connect to a WiFi hotspot that is not encrypted6. Use the command #ifconfig wlan0 192.168.43.10 netmask 255.255.255.0 up to set the IP and subnet mask (the red part of the IP depends on the actual situation)7. Using the command #route add default GW 192.168.43.18. Use the command #ifconfig wla

, 512 sets, linesize 32 bytes, 2-wayInfo: L1 (D-Cache): 32 KB, 128 sets, linesize 64 bytes, 4-wayInfo: L2 (uniied cache): 256 kb, 512 sets, linesize 64 bytes, 8-wayInfo: system control register:Info: instruction endian: LittleInfo: level-1 Instruction Cache disabledInfo: level-1 data cache disabledInfo: MMU disabledInfo: branch prediction EnabledFound 1 JTAG device, total irlen = 4:#0 ID: 0x5ba00477, irlen: 04, irprint: 0x1, coresight JTAG-DP (ARM)Cortex-A7 identified.Target Interface speed: 100

The hardware engineer built a USB hub line on the basis of sugar-Standard Later, he made the USB interface into the A20 sugar-cubieboard 2, so when the original IMG was burned in, the U port did not respond, only one port can use the mouse. According to the information, the android system automatically mounts the USB flash disk, which is related to a file named vold. fstab. So find./-name "vold. fstab" in the company's source code Android/directory

add the Mount operation: # Try to mount/private1Wait/dev/block/privateMount ext4/dev/block/private/private1 wait noatime nosuid nodev barrier = 0Setupfs/dev/block/privateUmount/private1Exec/system/bin/logwrapper/system/bin/e2fsck-y/dev/block/privateExec/system/bin/busybox Mount-T ext4-O noatime, nosuid, nodev, barrier = 0, journal_checksum, noauto_da_alloc/dev/block/private/private1 Save and re-compile and package. After the firmware is installed, the private1 directory will appear in the r

1. Compile the WiFi related function as module, generate Bcmdhd.ko, the module information of Bcmdhd.ko, this module depends on Cfg80211.ko and Rfkill.ko.2. Write the script, boot automatically load WiFi module.3. Use the command #ifconfig wlan0 up to turn on WiFi.2 firmware is required to open WiFi: Fw_bcm40181a2.bin and Nvram_ap6210.txt.Select firmware Fw_bcm40181a2.bin (defined in the firmware name program) based on the chip ID (ap6210 internal use bcm43362)Nvram_ap6210.txt defined in. config

A20 adb shell Command implementation hard disk partition 1' input busybox fdisk/dev/block/sda; 2' in Command (m for help): Then input m to view help; command (m for help ): mmCommand Actiona toggle a bootable flagb edit bsd encrypt toggle the dos encrypt flagd delete a previous list known partition typesn add a new partition create a new empty DOS partition tablep print the partition tableq quit without savchanging create a new empty Sun di Sklabelt c

If you only know the concept of CPU, then it is impossible to understand the CPU topology. In fact, in the NUMA architecture, the concept of CPU is from big to small: Node, Socket, Core, Logical Processor. With the development of multicore technology, we encapsulate multiple CPUs together, a package commonly referred to as a socket. Where the physical processor is plugged in, it looks like this: Each core