mirror of
https://xff.cz/git/u-boot/
synced 2025-10-31 02:15:45 +01:00
9f301294dd
The 10m50 devboard becomes the new golden reference design of Nios II Linux. So change README.nios2 to use 10m50 as template. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Acked-by: Marek Vasut <marex@denx.de>
96 lines
3.1 KiB
Plaintext
96 lines
3.1 KiB
Plaintext
Nios II is a 32-bit embedded-processor architecture designed
|
|
specifically for the Altera family of FPGAs.
|
|
|
|
Please refer to the link for more information on Nios II,
|
|
https://www.altera.com/products/processors/overview.html
|
|
|
|
Please refer to the link for Linux port and toolchains,
|
|
http://rocketboards.org/foswiki/view/Documentation/NiosIILinuxUserManual
|
|
|
|
The Nios II port of u-boot is controlled by device tree. Please check
|
|
out doc/README.fdt-control.
|
|
|
|
To add a new board/configuration (eg, mysystem) to u-boot, you will need
|
|
three files.
|
|
|
|
1. The device tree source which describes the hardware, dts file.
|
|
arch/nios2/dts/mysystem.dts
|
|
|
|
2. Default configuration of Kconfig, defconfig file.
|
|
configs/mysystem_defconfig
|
|
|
|
3. The legacy board header file.
|
|
include/configs/mysystem.h
|
|
|
|
The device tree source must be generated from your qsys/sopc design
|
|
using the sopc2dts tool. Then modified to fit your configuration. Please
|
|
find the sopc2dts download and usage at the wiki,
|
|
http://www.alterawiki.com/wiki/Sopc2dts
|
|
|
|
$ java -jar sopc2dts.jar --force-altr -i mysystem.sopcinfo -o mysystem.dts
|
|
|
|
You will need to add additional properties to the dts. Please find an
|
|
example at, arch/nios2/dts/10m50_devboard.dts.
|
|
|
|
1. Add "stdout-path=..." property with your serial path to the chosen
|
|
node, like this,
|
|
chosen {
|
|
stdout-path = &uart_0;
|
|
};
|
|
|
|
2. If you use SPI/EPCS or I2C, you will need to add aliases to number
|
|
the sequence of these devices, like this,
|
|
aliases {
|
|
spi0 = &epcs_controller;
|
|
};
|
|
|
|
Next, you will need a default config file. You may start with
|
|
10m50_defconfig, modify the options and save it.
|
|
|
|
$ make 10m50_defconfig
|
|
$ make menuconfig
|
|
$ make savedefconfig
|
|
$ cp defconfig configs/mysystem_defconfig
|
|
|
|
You will need to change the names of board header file and device tree,
|
|
and select the drivers with menuconfig.
|
|
|
|
Nios II architecture --->
|
|
(mysystem) Board header file
|
|
Device Tree Control --->
|
|
(mysystem) Default Device Tree for DT control
|
|
|
|
There is a selection of "Provider of DTB for DT control" in the Device
|
|
Tree Control menu.
|
|
|
|
( ) Separate DTB for DT control, will cat the dtb to end of u-boot
|
|
binary, output u-boot-dtb.bin. This should be used for production.
|
|
If you use boot copier, like EPCS boot copier, make sure the copier
|
|
copies all the u-boot-dtb.bin, not just u-boot.bin.
|
|
|
|
( ) Embedded DTB for DT control, will include the dtb inside the u-boot
|
|
binary. This is handy for development, eg, using gdb or nios2-download.
|
|
|
|
The last thing, legacy board header file describes those config options
|
|
not covered in Kconfig yet. You may copy it from 10m50_devboard.h.
|
|
|
|
$ cp include/configs/10m50_devboard.h include/configs/mysystem.h
|
|
|
|
Please change the SDRAM base and size to match your board. The base
|
|
should be cached virtual address, for Nios II with MMU it is 0xCxxx_xxxx
|
|
to 0xDxxx_xxxx.
|
|
|
|
#define CONFIG_SYS_SDRAM_BASE 0xc8000000
|
|
#define CONFIG_SYS_SDRAM_SIZE 0x08000000
|
|
|
|
You will need to change the environment variables location and setting,
|
|
too. You may change other configs to fit your board.
|
|
|
|
After all these changes, you may build and test.
|
|
|
|
$ export CROSS_COMPILE=nios2-elf- (or nios2-linux-gnu-)
|
|
$ make mysystem_defconfig
|
|
$ make
|
|
|
|
Enjoy!
|