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Find EEPROM device more reliably on BeagleBones #372

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Find EEPROM device more reliably on BeagleBones #372

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68fbb39
Find EEPROM device more reliably on BeagleBones
bgigous Dec 12, 2024
acaf6e6
BeagleBone: Fix logical error
bgigous Dec 12, 2024
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20 changes: 12 additions & 8 deletions adafruit_platformdetect/board.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries

Check failure on line 1 in adafruit_platformdetect/board.py

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reformatted
#
# SPDX-License-Identifier: MIT

Expand All @@ -20,6 +20,7 @@

"""

import glob
import os
import re

Expand Down Expand Up @@ -321,20 +322,23 @@
if "beaglev-starlight" in board_value:
return boards.BEAGLEV_STARLIGHT

# find device alias at i2c address 0x50 (0-00500, 0-00501, etc)
nvmem_devices = glob.glob('/sys/bus/nvmem/devices/0-0050*')
# do not expect there to be anything but one eeprom
if len(nvmem_devices) != 1:
return None

eeprom_dir = nvmem_devices[0]
try:
with open("/sys/bus/nvmem/devices/0-00500/nvmem", "rb") as eeprom:
with open(f"{eeprom_dir}/nvmem", "rb") as eeprom:
eeprom_bytes = eeprom.read(16)
except FileNotFoundError:
try:
with open("/sys/bus/nvmem/devices/0-00501/nvmem", "rb") as eeprom:
# Special Case for AI64
with open("/sys/bus/nvmem/devices/2-00500/nvmem", "rb") as eeprom:
eeprom_bytes = eeprom.read(16)
except FileNotFoundError:
try:
# Special Case for AI64
with open("/sys/bus/nvmem/devices/2-00500/nvmem", "rb") as eeprom:
eeprom_bytes = eeprom.read(16)
except FileNotFoundError:
return None
return None

if eeprom_bytes[:4] != b"\xaaU3\xee":
return None
Expand Down
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