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Kernel + rootfs v2 — sysfs GPIO, root-rw fix, libgpiod, sleep

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@flyboy-byte flyboy-byte released this 30 Aug 05:54
· 47 commits to main since this release
kernel-gpio-v2
2ad677f

Image + rootfs.ext2 for the tiny-rv32ima NOMMU target.

  • CONFIG_GPIO_SYSFS added alongside the existing chardev GPIO driver — /sys/class/gpio/exportN gives lock-free file-based GPIO access (echo/cat), better suited to shell/BASIC/Lua scripting than the exclusive-request chardev model. Coexists with /dev/gpiochip0, nothing removed.
  • Fixed root filesystem read-only bug: /etc/inittab's remount-rw step was both disabled and, once enabled, mis-ordered before /proc was mounted (busybox mount -o remount needs /proc/mounts). Root now actually persists writes across reboots.
  • libgpiod 1.6.4 tools added: gpiodetect, gpioinfo, gpioget, gpioset, gpiofind, gpiomon.
  • busybox CONFIG_SLEEP/CONFIG_FEATURE_FANCY_SLEEP enabled (sleep 0.5, sleep 2m etc now work; previously missing entirely).

DTB unchanged from pico-rv32ima-boards-v4/v5 — no device-tree edits needed for these changes, reuse the existing DTB.

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