br2_external's Introduction

Tibbo/SunPlus Buildroot Layers

Tibbo/SunPlus Linux BuildRoot layers for SoC

Plus1 (sp7021): A Linux Chip for IoT and Industrial Control Applications

Before build (do once)

brv="2021.02"
// or latest stable BuildRoot release
// brv="2022.05.1"
git clone [email protected]:tibbotech/br2_external.git
wget https://buildroot.org/downloads/buildroot-${brv}.tar.gz
tar -xvf ./buildroot-${brv}.tar.gz
rsync -a --exclude=.git ./buildroot-${brv}/ ./br2_external/br.a5/
rsync -a --exclude=.git ./buildroot-${brv}/ ./br2_external/br.a7/

Building OS for main CPU (A-Chip)

cd ./br2_external/
curdir=`pwd`
cd ./br.a7/
make BR2_EXTERNAL=${curdir}/br.LTPPxG2 LTPPxG2_defconfig && make && cd ${curdir}

Building bootloader and arm926 test code for co-processor (B-Chip, optional)

cd ./br2_external/
curdir=`pwd`
cd ./br.a5/
make BR2_EXTERNAL=${curdir}/br.LTPPxG2 LTPPxG2a5_defconfig && make && cd ${curdir}
cp ./br.a5/output/images/xboot.bin ./br.a7/output/images/
cp ./br.a5/output/images/a926*.bin ./br.a7/output/images/

Generating ISPBOOOT image

cd ./br2_external/br.a7/output/images/;
make -f ./sp_make.mk D1=. F_XBT=xboot F_UBT=u-boot.bin F_KRN=uImage F_ROO=rootfs.ext4

On success you'll get the ISPBOOOT.BIN at ./br2_external/br.a7/output/images/sp_out/

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ISPBOOT.BIN

Hi there, have built everything just fine.
The target was SDCard, got a 70 meg file starting with XBUT.

Dumb question: what is it? It's neither an image to flash (no partition table), nor a filesystem. According to makefile, it has to have everything inside - boot, dtb, kernel, and even a root fs, - but what's the way to have it sent it to the board?

Thanks in advance.

PS. The BR layer looks in fact very quick-n-dirty, no board package / genimage, thus weird image format. Investigating now...

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