git clone git://git.denx.de/u-boot.git
A quick introduction about Cross_Compiler :
The difference between a Native compiler (gcc) and a cross-compiler(e.g arm-none-linux gnueabi-gcc) is that the Native compiler runs on an architecture (for example x86_64) and produces binaries for the same architecture. A cross-compiler produces binaries for a different architecture (in our case ARMv7). In detail will be explained in upcoming Tutorials. Download binary from below website:
wget http://sourcery.mentor.com/public/gnu_toolchain/arm-none-linux-gnueabi/arm-2014.05-29-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
tar xvf arm-2014.05-29-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
Export binaries by adding at the end of ~/.bashrc file ,this is one time activity.
export PATH=/home/baohua/develop/ARM_Cross_Tools/arm-2014.05/bin:$PATH
Load default config for target board i.e vexpress_ca9x4_defconfig using 1st command and Compile U-boot using 2nd command shown in below .
cd u-boot
make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- vexpress_ca9x4_defconfig
make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-
Run below command and Hit any key to stop autoboot.
/usr/bin/qemu-system-arm -M vexpress-a9 -m 512M -kernel u-boot -nographic
Download Linux kernel source code, taking version 3.16 stable code cd linux git checkout 3.16
Prepare for compilation:
Load default config for target board i.e vexpress_defconfig. defconfig is explained here.
cd linux
make ARCH=arm CROSS_COMPILE=/home/baohua/develop/ARM_Cross_Tools/arm-2014.05/bin/arm-none-linux-gnueabi- vexpress_defconfig
Run below command to configure some settings :
make ARCH=arm CROSS_COMPILE=/home/baohua/develop/ARM_Cross_Tools/arm-2014.05/bin/arm-none-linux-gnueabi- menuconfig
Enable some settings as shown(*use space bar to enable).
Boot options —>
CONFIG_ARM_APPENDED_DTB: With this option, the boot code will look for a device tree binary (DTB) appended to zImage (e.g. cat zImage .dtb > zImage_w_dtb).
[*] Supplement the appended DTB with traditional ATAG information (NEW) (console=ttyAMA0) Default kernel command string.
CONFIG_ARM_ATAG_DTB_COMPAT:
Some old bootloaders can’t be updated to a DTB capable one, yet they provide ATAGs with memory configuration, the ramdisk address,the kernel cmdline string, etc. Such information is dynamically provided by the bootloader and can’t always be stored in a static DTB. To allow a device tree enabled kernel to be used with such bootloaders, this option allows zImage to extract the information from the ATAG list and store it at run time into the appended DTB.
Kernel hacking —>
[*] Kernel low-level debugging functions (read help!)
CONFIG_DEBUG_LL: Say Y here to include definitions of printascii, printch, printhex in the kernel. This is helpful if you are debugging code that executes before the console is initialized
Kernel low-level debugging port(Autodetect UART0 onVersatile Express Cortex-A core tiles) —> (X) Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)
CONFIG_DEBUG_VEXPRESS_UART0_CA9: This option selects UART0 at 0x10009000. Except for custom models,this applies only to the V2P-CA9 tile.
[*] Early printk
CONFIG_EARLY_PRINTK: Say Y here if you want to have an early console using the kernel low-level debugging functions. Add earlyprintk to your kernel parameters to enable this console.
Compile the kernel using below command :
make ARCH=arm CROSS_COMPILE=/home/baohua/develop/ARM_Cross_Tools/arm-2014.05/bin/arm-none-linux-gnueabi- all
Install and Test TFTP Server in Host Ubuntu machine:
* TFTP, a lightweight file transfer protocol, uses other software to get running: xinetd. * The xinetd program performs a neat job: it waits for network connections on ports (as specified in the/etc/services file) and, when a connection occurs, remaps the standard in and out to the read and write of the network connection. * This trick means that the program run by xinetd has code that uses file semantics (like scanf() and printf()) and reads and writes over a network connection. * Not all distributions have xinetd installed by default, so you may need to install it using your distribution’s package-management system.
sudo apt-get install xinetd tftpd tftp
# default: off
# description: The tftp server serves files using the trivial file transfer
# protocol. The tftp protocol is often used to boot diskless
# workstations, download configuration files to network-aware printers,
# and to start the installation process for some operating systems.
service tftp
{
socket_type = dgram
protocol = udp
wait = yes
user = root
server = /usr/sbin/in.tftpd
server_args = -s /tftpboot
disable = no
per_source = 11s
cps = 100 2
}
The lines of interest in this file are server_args, which indicates the directory where TFTP stores and looks for files. The kernel that is downloaded to the board needs to be placed in this directory.
sudo mkdir /srv/tftpboot
sudo chmod -R 777 /srv/tftpboot
sudo chown -R nobody /srv/tftpboot
sudo /etc/init.d/xinetd restart
Now tftp server will be up and starts running.
touch /srv/tftpboot/test
sudo chmod -R 777 /srv/tftpboot/test
Obtain the ip address of the tftp server using: ifconfig command. example we will consider the ip address as 192.168.1.2
peter@peter-ThinkPad-T430:~/work/src/abiaog.github.io/_posts$ tftp 192.168.1.106
tftp> get test
tftp> quit
peter@peter-ThinkPad-T430:~/work/src/abiaog.github.io/_posts$ ll test
-rw-r--r-- 1 peter peter 0 4月 30 20:52 test
You can try the same test on another computer on the network, to ensure that you can connect to the host from another machine (across the wire, as a network-person would say). If TFTP works from localhost but not from another computer, chances are the firewall is still running. Stop this service, and try again.
get test with tftp, error code 2 access violationcheck info in /var/log/syslog as below,
Apr 30 20:44:22 peter-ThinkPad-T430 in.tftpd[8769]: connect from 192.168.1.106 (192.168.1.106) Apr 30 20:44:22 peter-ThinkPad-T430 tftpd[8770]: tftpd: trying to get file: test Apr 30 20:44:22 peter-ThinkPad-T430 tftpd[8770]: tftpd: serving file from /srv/tftp
Refer to tftp error code 2 access violation
u-boot-arm-versatile-express-emulation-on-qemu-with-nfs-as-rootfs
git clone git://git.denx.de/u-boot.git
cd u-boot/
git tag -l
git checkout -b 201009 v2010.09
git branch
Makefile,
MKCONFIG := $(SRCTREE)/mkconfig
%_config:: unconfig
@$(MKCONFIG) -A $(@:_config=)
make zynq_zed_config expands to mkconfig -A zynq_zed