Estou tentando encontrar uma maneira melhor de determinar quais alterações específicas de firmware foram feitas no chipset WiFi Broadcom / Cypress executado no Raspberry Pi3. O chip em questão é o BCM943430 , mas a questão realmente abrangeria uma classe inteira de drivers. Também ajudaria a resolver problemas e modificações do driver que não estão documentados em outro lugar. O driver changelogs é extremamente minimalista, para dizer o mínimo.
Por exemplo, na última atualização de firmware, a string FW Capabilities pode ser extraída por:
# strings -a brcmfmac43430-sdio.bin |tail -2
43430a1-roml/sdio-g-p2p-pool-pno-pktfilter-keepalive-aoe-mchan-tdls-proptxstatus-ampduhostreorder-lpc-sr-bcmcps
Version: 7.45.41.46 (r666254 CY)
CRC: 970a33e2 Date: Mon 2017-08-07 00:48:36 PDT
Ucode Ver: 1043.206
FWID 01-ef6eb4d3
Nesse caso, a primeira parte são os recursos fornecidos pelo driver, separados por um traço ( - ).
ampduhostreorder
aoe
bcmcps
g
keepalive
lpc
mchan
p2p
pktfilter
pno
pool
proptxstatus
sdio
sr
tdls
Suponho que eles devam coincidir com o que é mostrado com o comando iw list .
# iw list
Wiphy phy0
max # scan SSIDs: 10
max scan IEs length: 2048 bytes
max # sched scan SSIDs: 16
max # match sets: 16
max # scan plans: 1
max scan plan interval: -1
max scan plan iterations: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Device supports T-DLS.
Supported Ciphers:
* WEP40 (00-0f-ac:1)
* WEP104 (00-0f-ac:5)
* TKIP (00-0f-ac:2)
* CCMP-128 (00-0f-ac:4)
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* P2P-client
* P2P-GO
* P2P-device
Band 1:
Capabilities: 0x1020
HT20
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT TX/RX MCS rate indexes supported: 0-7
Bitrates (non-HT):
* 1.0 Mbps
* 2.0 Mbps (short preamble supported)
* 5.5 Mbps (short preamble supported)
* 11.0 Mbps (short preamble supported)
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
Frequencies:
* 2412 MHz [1] (20.0 dBm)
* 2417 MHz [2] (20.0 dBm)
* 2422 MHz [3] (20.0 dBm)
* 2427 MHz [4] (20.0 dBm)
* 2432 MHz [5] (20.0 dBm)
* 2437 MHz [6] (20.0 dBm)
* 2442 MHz [7] (20.0 dBm)
* 2447 MHz [8] (20.0 dBm)
* 2452 MHz [9] (20.0 dBm)
* 2457 MHz [10] (20.0 dBm)
* 2462 MHz [11] (20.0 dBm)
* 2467 MHz [12] (20.0 dBm)
* 2472 MHz [13] (20.0 dBm)
* 2484 MHz [14] (20.0 dBm)
Supported commands:
* new_interface
* set_interface
* new_key
* start_ap
* join_ibss
* set_pmksa
* del_pmksa
* flush_pmksa
* remain_on_channel
* frame
* set_channel
* tdls_oper
* start_sched_scan
* start_p2p_device
* crit_protocol_start
* crit_protocol_stop
* connect
* disconnect
Supported TX frame types:
* managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
* P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
* P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
* P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
Supported RX frame types:
* managed: 0x40 0xd0
* P2P-client: 0x40 0xd0
* P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
* P2P-device: 0x40 0xd0
software interface modes (can always be added):
valid interface combinations:
* #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,
total <= 3, #channels <= 1
* #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,
total <= 4, #channels <= 1
Device supports scan flush.
ou possivelmente com o comando iw features :
# iw features
nl80211 features: 0x1
* split wiphy dump
pi@xxx:~ $ iw commands
1 (0x1): get_wiphy
2 (0x2): set_wiphy
3 (0x3): new_wiphy
4 (0x4): del_wiphy
5 (0x5): get_interface
6 (0x6): set_interface
7 (0x7): new_interface
8 (0x8): del_interface
9 (0x9): get_key
10 (0xa): set_key
11 (0xb): new_key
12 (0xc): del_key
13 (0xd): get_beacon
14 (0xe): set_beacon
15 (0xf): start_ap
16 (0x10): stop_ap
17 (0x11): get_station
18 (0x12): set_station
19 (0x13): new_station
20 (0x14): del_station
21 (0x15): get_mpath
22 (0x16): set_mpath
23 (0x17): new_mpath
24 (0x18): del_mpath
25 (0x19): set_bss
26 (0x1a): set_reg
27 (0x1b): req_set_reg
28 (0x1c): get_mesh_config
29 (0x1d): set_mesh_config
30 (0x1e): Unknown command (30)
31 (0x1f): get_reg
32 (0x20): get_scan
33 (0x21): trigger_scan
34 (0x22): new_scan_results
35 (0x23): scan_aborted
36 (0x24): reg_change
37 (0x25): authenticate
38 (0x26): associate
39 (0x27): deauthenticate
40 (0x28): disassociate
41 (0x29): michael_mic_failure
42 (0x2a): reg_beacon_hint
43 (0x2b): join_ibss
44 (0x2c): leave_ibss
45 (0x2d): testmode
46 (0x2e): connect
47 (0x2f): roam
48 (0x30): disconnect
49 (0x31): set_wiphy_netns
50 (0x32): get_survey
51 (0x33): new_survey_results
52 (0x34): set_pmksa
53 (0x35): del_pmksa
54 (0x36): flush_pmksa
55 (0x37): remain_on_channel
56 (0x38): cancel_remain_on_channel
57 (0x39): set_tx_bitrate_mask
58 (0x3a): register_frame
59 (0x3b): frame
60 (0x3c): frame_tx_status
61 (0x3d): set_power_save
62 (0x3e): get_power_save
63 (0x3f): set_cqm
64 (0x40): notify_cqm
65 (0x41): set_channel
66 (0x42): set_wds_peer
67 (0x43): frame_wait_cancel
68 (0x44): join_mesh
69 (0x45): leave_mesh
70 (0x46): unprot_deauthenticate
71 (0x47): unprot_disassociate
72 (0x48): new_peer_candidate
73 (0x49): get_wowlan
74 (0x4a): set_wowlan
75 (0x4b): start_sched_scan
76 (0x4c): stop_sched_scan
77 (0x4d): sched_scan_results
78 (0x4e): sched_scan_stopped
79 (0x4f): set_rekey_offload
80 (0x50): pmksa_candidate
81 (0x51): tdls_oper
82 (0x52): tdls_mgmt
83 (0x53): unexpected_frame
84 (0x54): probe_client
85 (0x55): register_beacons
86 (0x56): unexpected_4addr_frame
87 (0x57): set_noack_map
88 (0x58): ch_switch_notify
89 (0x59): start_p2p_device
90 (0x5a): stop_p2p_device
91 (0x5b): conn_failed
92 (0x5c): set_mcast_rate
93 (0x5d): set_mac_acl
94 (0x5e): radar_detect
95 (0x5f): get_protocol_features
96 (0x60): update_ft_ies
97 (0x61): ft_event
98 (0x62): crit_protocol_start
99 (0x63): crit_protocol_stop
100 (0x64): get_coalesce
101 (0x65): set_coalesce
102 (0x66): channel_switch
103 (0x67): vendor
104 (0x68): set_qos_map
105 (0x69): add_tx_ts
106 (0x6a): del_tx_ts
107 (0x6b): get_mpp
108 (0x6c): join_ocb
109 (0x6d): leave_ocb
110 (0x6e): ch_switch_started_notify
111 (0x6f): tdls_channel_switch
112 (0x70): tdls_cancel_channel_switch
113 (0x71): wiphy_reg_change
114 (0x72): abort_scan
115 (0x73): start_nan
116 (0x74): stop_nan
117 (0x75): add_nan_function
118 (0x76): del_nan_function
119 (0x77): change_nan_config
120 (0x78): nan_match
Tenho certeza de que deve haver algumas referências ou documentação em algum lugar, mas não consegui encontrá-lo.
Como / onde posso descobrir mais o que significam esses vários recursos de driver de Wi-Fi?