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fix(nixos/upboard): release ttyS4 from kernel console for F56 dispenser

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The Fujitsu F56 bill dispenser on Sintra is wired to the SoC's MMIO
UART at 0xa171b000, which the kernel enumerates as ttyS4 (the only
real on-board UART besides the legacy ttyS0 at I/O 0x3f8). The
existing kernelParams routed the kernel console through ttyS4, so
userspace could never open it: HAL crashed at startup with
"Input/output error setting custom baud rate of 9600" when trying
to initialise the dispenser, which in turn aborted the entire ATM
init chain in production mode (HAL failure → initError set → kiosk
shows "ATM unavailable" → Lightning client never gets to even try
talking to LNbits).

Two coordinated changes:

1. Drop `console=ttyS4,115200n8` from kernelParams. Keep `console=tty0`
   so kernel messages still land on the framebuffer console during
   boot. Anyone who wants a serial debug console can point it at
   ttyS0 (the legacy 8250 at I/O 0x3f8) — that port stays free.

2. Extend the dispenser-tag udev rules: add `KERNEL=="ttyS4"
   SYMLINK+="ttyJ7"` alongside the existing ttyS1 / ttyS5 entries.
   Different UP Board variants enumerate the dispenser-side UART
   under different kernel-allocated indices; whichever real device
   shows up at boot gets the ttyJ7 alias HAL is wired to expect.

Diagnostic before/after on Sintra (`stty -F /dev/ttyJ7 9600`):
  before: Input/output error
  after:  OK

Once this rolls out the renderer should progress past HAL init,
proceed to initializeLightningServices(), and start connecting to
LNbits over the nostr transport.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Padreug 2026-05-13 17:58:22 +02:00
commit 2551c6fcf8
1 changed files with 14 additions and 2 deletions
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16
deploy/nixos/hardware/upboard.nix
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@ -49,7 +49,13 @@
kernelParams = [
"i915.enable_psr=0"
"console=ttyS4,115200n8"
# NOTE: do NOT route the kernel console through ttyS4 on Sintra.
# ttyS4 is the SoC's MMIO 16550A (the only real UART besides the
# legacy ttyS0 at I/O 0x3f8) and is wired to the Fujitsu F56
# dispenser's RS-232 header on Sintra. Holding it as console
# prevents userspace from opening it at 9600 baud and HAL fails
# with "Input/output error setting custom baud rate of 9600".
# If you want serial debug, point console at ttyS0 instead.
"console=tty0"
"quiet"
"splash"
@ -118,8 +124,14 @@
KERNELS=="1-7.3:1.0", SYMLINK+="ttyJ5"
KERNEL=="ttyUSB1", SYMLINK+="ttyJ5"
# Dispenser (ttyJ7)
# Dispenser (ttyJ7).
# ttyS1 / ttyS5 cover earlier UP Board variants where the dispenser
# lands on those kernel-enumerated serial nodes; ttyS4 covers the
# Sintra (UP Board Atom/Apollo Lake) where the dispenser is wired
# to the SoC's MMIO UART. Whichever device actually exists at
# runtime gets the ttyJ7 symlink.
KERNEL=="ttyS1", SYMLINK+="ttyJ7"
KERNEL=="ttyS4", SYMLINK+="ttyJ7"
KERNEL=="ttyS5", SYMLINK+="ttyJ7"
# Legacy ttyAMA0 alias