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Update README.md 

Expanded building instructions and added link to bootloader upgrade info.
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Giedrius 2014-11-13 13:19:09 +02:00
parent 393bc3d166
commit ee73981958
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README.md
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@ -7,13 +7,49 @@ U-Boot for Carambola2 based boards
Build
-------
Use buildroot toolchain (http://buildroot.org/download.html) to build Caraboot. OpenWRT toolchain is known to generate broken binaries.
To build suitable toolchain in buildroot's menuconfig select: MIPS big endian architecture (mips32 r2 variant), and GCC version - 4.7.x (other GCC versions untested, but may work)
1) Build buildroot toolchain (http://buildroot.org)
Change Makefile's CONFIG_TOOLCHAIN_PREFIX variable to your buildroot path, for example:
Download:
```
CONFIG_TOOLCHAIN_PREFIX=~/build/buildroot/output/host/usr/bin/mips-linux-
cd your_work_dir
git clone git://git.buildroot.net/buildroot
```
Configure:
```
cd buildroot
make menuconfig
```
In Target Options select Target Architecture as MIPS (big endian) and Target Architecture Variant as mips 32r2.
In Toolchain select GCC Compiler version as gcc 4.7.x.
Save and exit.
Build:
```
make
```
run ```make```, binary will be in ```bin/carambola2_u-boot.bin```
2) Build Caraboot image
Download:
```
cd your_work_dir
git clone https://github.com/8devices/Caraboot.git
```
Configure:
Open Caraboot Makefile and change CONFIG_TOOLCHAIN_PREFIX to your buildroot binary path, i.e ```CONFIG_TOOLCHAIN_PREFIX=your_work_dir/buildroot/output/host/usr/bin/mips-linux- ```
```
cd Caraboot
vi/nano/gedit Makefile
```
Build:
```
make
```
The bootloader binary will be saved to ```bin/carambola2_u-boot.bin``` file.
You can now use this file to upgrade your bootloader on Carambola2 board (http://8devices.com/wiki/carambola:2:gettingstarted:bootloader-upgrade)