Floor shows a staged BIOS update from the start of WinPE; NIC speed past 4.29 Gb/s

- winpe-status-push.ps1: check-bios.cmd stages the firmware update before
  the imaging menu, but startnet's 'BIOS firmware update' push only comes
  at the end of WinPE, so builds showed a plain 'Applying image' for the
  whole apply. The first push now reports the staged update when
  X:\bios-fired.flag exists, and the floor shows 'Applying image - BIOS
  update staged' (do not power off during the next reboot). Also: CIM
  fallback for the serial where wmic is missing, and standard/engineer
  always report 5 steps.
- Network pill: cdc_ncm (e.g. the WisdPI RTL8157 5G adapter) keeps link
  speed in a 32-bit bits/s field, so 5 Gb/s reads 705 Mb/s; show the real
  speed with a note.

Tested in the win11 VM (with and without the BIOS flag, and the late
startnet push).

webapp/services/nic_status.py

@@ -22,6 +22,11 @@ import config
 
 STALE_SECONDS = 20 * 60  # the watch timer runs every 5 min
 SYS_NET = "/sys/class/net"
+# cdc_ncm (the generic USB NIC driver, e.g. a WisdPI RTL8157 5G adapter on a
+# kernel whose r8152 does not know the chip) keeps the link speed as a 32-bit
+# bits-per-second value, so multi-gig links wrap: 5 Gb/s reads 705 Mb/s and
+# 10 Gb/s reads 1410 Mb/s.
+CDC_NCM_WRAPPED = {705: 5000, 1410: 10000}
 
 
 def _read(path):
@@ -102,13 +107,19 @@ def _kernel_view():
             speed = speed if speed > 0 else None
         except ValueError:
             speed = None
+        notes = []
+        driver = os.path.basename(os.path.realpath(os.path.join(base, "device", "driver")))
+        if driver == "cdc_ncm" and speed in CDC_NCM_WRAPPED:
+            notes.append(f"Link {CDC_NCM_WRAPPED[speed] // 1000} Gb/s (the cdc_ncm driver reports "
+                         f"{speed} Mb/s: its 32-bit speed counter wraps above 4.29 Gb/s)")
+            speed = CDC_NCM_WRAPPED[speed]
         out.append({
             "iface": name, "mac": mac,
             "role": roles.get(name) or roles.get(mac) or "other",
             "link": "up" if oper == "up" else "down",
             "speed_mbps": speed if oper == "up" else None,
             "addrs": addrs.get(name, []),
-            "verdict": None, "evidence": [],
+            "verdict": None, "evidence": [], "notes": notes,
             "dnsmasq_bound": (None if bound is None else (name in bound or "*" in bound)),
         })
     return out
@@ -170,7 +181,7 @@ def status():
             i = dict(i)
             k = live.get(i.get("iface"))
             if k:  # link and addresses are cheap to read now; keep the check's verdict
-                i.update(link=k["link"], speed_mbps=k["speed_mbps"], addrs=k["addrs"])
+                i.update(link=k["link"], speed_mbps=k["speed_mbps"], addrs=k["addrs"], notes=k["notes"])
                 if k["dnsmasq_bound"] is not None:
                     i["dnsmasq_bound"] = k["dnsmasq_bound"]
             if stale: