Rainbow Electronics QIL-A9260-C11 - Manual (Page 8)

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1. Buildroot
Buildroot allows to generate both a cross-compilation toolchain and a jffs2 root file system
for the QIL-A9260 module.
1.1. Buildroot installation
Here are the steps needed to install a cross compiler & generate a root file system:
●
Download the source code from the calao ftp site
The configuration step is very similar to the linux kernel. Indeed, if you want to custumize
buildroot issue the following command:
●
make menuconfig
Once everything is configured, issue the make command
Note: You could also custumize busybox by issuing the following command:
make busybox-menuconfig
●
make
Once finished, we should obtain a rootfs.arm.jffs2 which could be program in one of the
available nand flash partition.
1.2. How to install the Root FS on the QIL-A9260
The QIL-A9260 boots a linux kernel pre-installed in the nand flash memory. Here is a brief
description of the nand flash memory mapping.On the first partition, we reserved the first
16Mbytes for the linux kernels. Indeed at the 0x000A0000 offset we put a rescue linux
kernel bound to a compressed cpio rfs image and at the 0x400000 offset we put a second
linux kernel which mounts the RFS from the 2
nd partition. Then we find two 120 Mbytes
partitions. We put on the first one the default jffs2 root file system and let the second one
available for the user.
Here is the list of the default partitions:
➢
0x00000000-0x01000000 : "Uboot & Kernel"
➢
0x01000000-0x08800000 : "Root FS"
➢
0x08800000-0x10000000 : "FS"
Note: You can customize the nand flash memory mapping by editing the board-qil-a9260.c
located in the /arch/arm/mach-at91/ directory of the linux kernel source tree.
Datasheet GSG-00006-A01 8/34