57 lines
2 KiB
Markdown
57 lines
2 KiB
Markdown
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# Business Card Linux
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This is the Linux distribution small enough to run from the 8MB of storage on my Linux-powered business card.
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It is powered by the Allwinner F1C100s, a $1.40 Linux-capable ARM system-on-chip.
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This repository is the source code for its firmware image, based on Buildroot 2019.05.
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This directory is a "Buildroot external," providing a few patches, additional packages, and board support files on top of mainline Buildroot.
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For a complete write-up, see my [blog post][blog-post] about the project.
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## Patched Linux and U-Boot
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I lightly patched the Linux kernel and U-Boot to get all the hardware peripherals working.
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You can find my forks here:
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- [Linux][linux-f1c100s] v5.0.2 (patched to enable USB gadget mode)
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- [U-Boot][uboot-f1c100s] (patched to support the F1C100s)
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## Build
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Make sure submodules are initialized:
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git submodule update --init
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Change to the top-level Buildroot directory:
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cd buildroot
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Initialize the configuration, including the defconfig and this external directory:
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make BR2_EXTERNAL=$PWD/../ thirtythreeforty_businesscard_defconfig
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And compile:
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make
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This may take a couple hours to do from scratch, depending on the speed of your machine.
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## Installation
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If you have a [Lichee Pi Nano][lichee-nano] with a flash chip, or one of my blank business cards, you can flash it with the following command.
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Make sure the board is in FEL mode using `dmesg` or similar.
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output/host/bin/sunxi-fel -p spiflash-write 0 output/images/flash.bin
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You can erase the card after it boots by simply logging in (as `root`) and erasing the flash manually:
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dd if=/dev/zero of=/dev/mtd0
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Don't erase it unless you're prepared to burn a new image!
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[blog-post]: https://www.thirtythreeforty.net/posts/2019/12/my-business-card-runs-linux/
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[linux-f1c100s]: https://github.com/thirtythreeforty/linux.git
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[uboot-f1c100s]: https://github.com/thirtythreeforty/u-boot.git
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[lichee-nano]: https://www.seeedstudio.com/Sipeed-Lichee-Nano-Linux-Development-Board-16M-Flash-WiFi-Version-p-2893.html
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