adamksmith
a911b9e4cb
ESPHome external_component that presents a synthetic 64 KB FAT12 disk over the ESP32-S3's native USB-OTG, containing a one-byte switch_position file and a switch_position_grub.cfg snippet. The disk's volume serial is fixed at 0x55AA6922 to stay drop-in compatible with the upstream /etc/grub.d hook. Components: - fat12 / msc_disk: portable FAT12 sector synthesiser ported from reference/src/fat.c and the boot-sector / FAT / dir-entry generation in reference/src/usb.c. - usb_descriptors / tusb_glue: TinyUSB MSC class with our own callbacks delegating to MscDisk::read_lba (linker --allow-multiple-definition picks ours over esp_tinyusb's storage-backed defaults). - grub_boot_switch: top-level Component, NVS persistence on target changes, exposes targets table to sub-platforms. - select: HA-facing select platform reading parent's targets map. Validated end-to-end on an ESP32-S3-DevKitC-1: USB enumerates as 26ba:8003, /dev/sdb mounts FAT12, mtype reads back the live target, and POST /select/boot_target/set?option=Windows updates both files on the next host read.
37 lines
679 B
YAML
37 lines
679 B
YAML
esphome:
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name: grub-boot-switch
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friendly_name: GRUB boot switch
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esp32:
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board: esp32-s3-devkitc-1
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framework:
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type: esp-idf
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logger:
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api:
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ota:
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- platform: esphome
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wifi:
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ssid: !secret wifi_ssid
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password: !secret wifi_password
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external_components:
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- source:
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type: local
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path: components
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components: [grub_boot_switch]
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grub_boot_switch:
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id: bootsw
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# volume_serial: 0x55AA6922 # default — matches upstream GRUB hook
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# volume_label: SWITCH # default
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initial_target: 0
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# Phase 4 will add the select platform here:
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#
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# select:
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# - platform: grub_boot_switch
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# name: "Boot Target"
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# options: [Linux, Windows, Recovery]
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