Sometimes, to ignore OS driver influences, we may ask customer or FAE member to perform device check under UEFI shell. By this way , it's kind of driver-less check as EE usually did under DOS environment. The difference is we don't have to plug into an USB pen for bootable DOS, it's just required to select UEFI-sell in BIOS menu to get into.
You can get in BIOS and choose “UEFI: Built-in EFI Shell” in Override to get in EFI Shell. Or choose "Built-in EFI Shell" as 1st boot option and then Save & Exit.
Commands in UEFI are quite similar we execute under Linux OS.
for example : pci , pci <bus> i
ex. PCI list
Shell> pci
Seg Bus Dev Func
--- --- --- ----
00 00 00 00 ==> Bridge Device - Host/PCI bridge
Vendor 8086 Device 2020 Prog Interface 0
00 00 04 00 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2021 Prog Interface 0
00 00 04 01 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2021 Prog Interface 0
00 00 04 02 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2021 Prog Interface 0
00 00 04 03 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2021 Prog Interface 0
00 00 04 04 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2021 Prog Interface 0
00 00 04 05 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2021 Prog Interface 0
00 00 04 06 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2021 Prog Interface 0
00 00 04 07 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2021 Prog Interface 0
00 00 05 00 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2024 Prog Interface 0
00 00 05 02 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2025 Prog Interface 0
00 00 05 04 ==> Base System Peripherals - PIC
Vendor 8086 Device 2026 Prog Interface 20
00 00 08 00 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2014 Prog Interface 0
00 00 08 01 ==> Data Acquisition & Signal Processing Controllers - Performance Counters
Vendor 8086 Device 2015 Prog Interface 0
00 00 08 02 ==> Base System Peripherals - Other system peripheral
Vendor 8086 Device 2016 Prog Interface 0
00 00 11 00 ==> Device does not fit in any defined classes -
Vendor 8086 Device A1EC Prog Interface 0
00 00 11 01 ==> Device does not fit in any defined classes -
Vendor 8086 Device A1ED Prog Interface 0
00 00 11 05 ==> Mass Storage Controller - Serial ATA controller
Vendor 8086 Device A1D2 Prog Interface 1
...
...
...
ex. List more detail on specific device 72:00.3, and user may search link speed & Link Width to check components bandwidth in UEFI shell.
Shell> pci 72 00 3 -i
PCI Segment 00 Bus 72 Device 00 Func 03 [EFI 0072000300]
00000000: 86 80 22 15 47 01 10 00-01 00 00 02 10 00 80 00 *..".G...........*
00000010: 00 00 80 E0 00 00 00 00-01 60 00 00 00 00 88 E0 *.........`......*
00000020: 00 00 00 00 00 00 00 00-00 00 00 00 FF FF 00 00 *................*
00000030: 00 00 00 00 40 00 00 00-00 00 00 00 FF 04 00 00 *....@...........*
00000040: 01 50 23 48 08 20 00 00-00 00 00 00 00 00 00 00 *.P#H. ..........*
00000050: 05 70 80 01 00 00 00 00-00 00 00 00 00 00 00 00 *.p..............*
00000060: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
00000070: 11 A0 09 00 03 00 00 00-03 20 00 00 00 00 00 00 *......... ......*
00000080: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
00000090: 00 00 00 00 00 00 00 00-00 00 00 00 FF FF FF FF *................*
000000A0: 10 E0 02 00 C2 8C 00 10-37 28 09 00 42 EC 42 0B *........7(..B.B.*
000000B0: 00 00 42 10 00 00 00 00-00 00 00 00 00 00 00 00 *..B.............*
000000C0: 00 00 00 00 1F 08 00 00-00 00 00 00 00 00 00 00 *................*
000000D0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
000000E0: 03 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
000000F0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
Vendor ID(0): 8086 Device ID(2): 1522
Command(4): 0147
(00)I/O space access enabled: 1 (01)Memory space access enabled: 1
(02)Behave as bus master: 1 (03)Monitor special cycle enabled: 0
(04)Mem Write & Invalidate enabled: 0 (05)Palette snooping is enabled: 0
(06)Assert PERR# when parity error: 1 (07)Do address/data stepping: 0
(08)SERR# driver enabled: 1 (09)Fast back-to-back transact...: 0
Status(6): 0010
(04)New Capabilities linked list: 1 (05)66MHz Capable: 0
(07)Fast Back-to-Back Capable: 0 (08)Master Data Parity Error: 0
(09)DEVSEL timing: Fast (11)Signaled Target Abort: 0
(12)Received Target Abort: 0 (13)Received Master Abort: 0
(14)Signaled System Error: 0 (15)Detected Parity Error: 0
Revision ID(8): 01 BIST(0F): Incapable
Cache Line Size(C): 10 Latency Timer(D): 00
Header Type(0E): 80, Multi-function, PCI device
Class: Network Controller - Ethernet controller -
Base Address Registers(10):
Start_Address Type Space Prefetchable? Size Limit
--------------------------------------------------------------------------
E0800000 Mem 32 bits No 00020000 E081FFFF
6000 I/O 0020 601F
E0880000 Mem 32 bits No 00004000 E0883FFF
--------------------------------------------------------------------------
Expansion ROM Disabled(30)
Cardbus CIS ptr(28): 00000000
Sub VendorID(2C): FFFF Subsystem ID(2E): 0000
Capabilities Ptr(34): 40
Interrupt Line(3C): FF Interrupt Pin(3D): 04
Min_Gnt(3E): 00 Max_Lat(3F): 00
Pci Express device capability structure:
CapID( 0): 10 NextCap Ptr( 1): E0
Cap Register( 2): 0002
Capability Version(3:0): 0x0002
Device/PortType(7:4): PCI Express Endpoint
Interrupt Message Number(13:9): 0x00000
Device Capabilities( 4): 10008CC2
Max_Payload_Size Supported(2:0): 512 bytes
Phantom Functions Supported(4:3): 0
Extended Tag Field Supported(5): 5-bit Tag field supported
Endpoint L0s Acceptable Latency(8:6): Maximum of 512 ns
Endpoint L1 Acceptable Latency(11:9): Maximum of 128 us
Role-based Error Reporting(15): 1
Function Level Reset Capability(28): 1
Device Control( 8): 2837
Correctable Error Reporting Enable(0): 1
Non-Fatal Error Reporting Enable(1): 1
Fatal Error Reporting Enable(2): 1
Unsupported Request Reporting Enable(3): 0
Enable Relaxed Ordering(4): 1
Max_Payload_Size(7:5): 256 bytes
Extended Tag Field Enable(8): 0
Phantom Functions Enable(9): 0
Auxiliary (AUX) Power PM Enable(10): 0
Enable No Snoop(11): 1
Max_Read_Request_Size(14:12): 512 bytes
Device Status( A): 0009
Correctable Error Detected(0): 1
Non-Fatal Error Detected(1): 0
Fatal Error Detected(2): 0
Unsupported Request Detected(3): 1
AUX Power Detected(4): 0
Transactions Pending(5): 0
Link Capabilities( C): 0B42EC42
Maximum Link Speed(3:0): 5.0 GT/s
Maximum Link Width(9:4): x4
Active State Power Management Support(11:10): L0s and L1 Supported
L0s Exit Latency(14:12): 2us-4us
L1 Exit Latency(17:15): 32us-64us
Clock Power Management(18): 0
Surprise Down Error Reporting Capable(19): 0
Data Link Layer Link Active Reporting Capable(20): 0
Link Bandwidth Notification Capability(21): 0
Port Number(31:24): 0x0B
Link Control(10): 0000
Active State Power Management Control(1:0): Disabled
Read Completion Boundary (RCB)(3): 64 byte
Common Clock Configuration(6): 0
Extended Synch(7): 0
Enable Clock Power Management(8): 0
Hardware Autonomous Width Disable(9): 0
Link Bandwidth Management Interrupt Enable(10): 0
Link Autonomous Bandwidth Interrupt Enable(11): 0
Link Status(12): 1042
Current Link Speed(3:0): 5.0 GT/s
Negotiated Link Width(9:4): x4
Link Training(11): 0
Slot Clock Configuration(12): 1
Data Link Layer Link Active(13): 0
Link Bandwidth Management Status(14): 0
Link Autonomous Bandwidth Status(15): 0
Slot Capabilities(14): 00000000
Slot Control(18): 0000
Slot Status(1A): 0000
Root Control(1C): 0000
Root Capabilities(1E): 0000
Root Status(20): 00000000
Start dumping PCIex extended configuration space (0x100 - 0xFFF).
00000100: 01 00 02 14 00 00 00 00-00 00 10 00 31 20 46 00 *............1 F.*
00000110: 00 20 00 00 00 20 00 00-A0 00 00 00 00 00 00 00 *. ... ..........*
00000120: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
00000130: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
00000140: 03 00 01 15 79 0B F1 FF-FF A4 9A 2C 00 00 00 00 *....y......,....*
00000150: 0E 00 01 16 00 00 00 00-00 00 00 00 00 00 00 00 *................*
00000160: 10 00 01 1A 00 00 00 00-00 00 00 00 08 00 08 00 *................*
00000170: 00 00 03 00 80 00 04 00-00 00 20 15 53 05 00 00 *.......... .S...*
00000180: 01 00 00 00 0C 00 A2 BF-00 38 00 00 00 00 00 00 *.........8......*
00000190: 0C 00 A0 BF 00 38 00 00-00 00 00 00 00 00 00 00 *.....8..........*
000001A0: 17 00 01 1D 05 02 07 00-00 00 00 00 00 00 00 00 *................*
000001B0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
...
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