Bugs-evident cleanup: cable-measure failure is fatal with its reason (failed/fail pretend-path and dead relinked plumbing deleted), bcm.command refuses partial SETs (0 or 5 params, stale-DATA trap made structural), BOOT gains a patched-ixgbe check naming stock-driver boots, panel fault rows matched by label and console rows strict on column count, phy.go split into sff/bcm/rollball and main.go's direction machinery into direction.go (pure moves), input events decoded via encoding/binary, gofmt; verified on hardware (20.00G, zero errors, ECD 41m)

init.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 	"time"
 
 	"golang.org/x/sys/unix"
@@ -89,6 +91,32 @@ func mountFilesystems() []checkResult {
 	return out
 }
 
+// The sff_i2c debugfs node is the patched driver's signature. Checked up front
+// because stock ixgbe also refuses the FS module's EEPROM and leaves its port
+// with no netdev, so the missing patch would otherwise surface later as a
+// baffling "want 2 ixgbe interfaces, found 1".
+func checkPatchedIxgbe() checkResult {
+	res := checkResult{item: "patched ixgbe"}
+	devs, err := filepath.Glob("/sys/kernel/debug/ixgbe/*")
+	if err != nil {
+		res.err = err
+		return res
+	}
+	if len(devs) == 0 {
+		res.err = fmt.Errorf("no ixgbe devices in debugfs; run ./load-ixgbe")
+		return res
+	}
+	for _, d := range devs {
+		if _, err := os.Stat(d + "/sff_i2c"); err != nil {
+			res.err = fmt.Errorf("%s has no sff_i2c: stock ixgbe loaded; run ./load-ixgbe",
+				filepath.Base(d))
+			return res
+		}
+	}
+	res.state = fmt.Sprintf("sff_i2c on %d devices", len(devs))
+	return res
+}
+
 const (
 	touchTimeout = 30 * time.Second
 	touchPoll    = 100 * time.Millisecond
@@ -123,9 +151,10 @@ func waitForTouchscreen() checkResult {
 
 func bootstrap() []checkResult {
 	out := mountFilesystems()
-	// /dev/input/event* only exists once devtmpfs is mounted above.
+	// debugfs and /dev/input/event* only exist once the mounts above are in.
 	if out[len(out)-1].err != nil {
 		return out
 	}
+	out = append(out, checkPatchedIxgbe())
 	return append(out, waitForTouchscreen())
 }