hardware prototyping using a windows-hosted uefi environment · 6/1/2011 · hardware prototyping...
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Hardware Prototyping Using a Windows-Hosted UEFI environment
UEFI Summer Plugfest – July 6-9, 2011Presented by Tim Lewis (Phoenix
Technologies Ltd.)
UEFI Plugfest – July 2011 www.uefi.org 1
Updated 2011-06-01
Agenda
• Introduction
• SMBus and UEFI Overview
• Adding ASF, DASH & IPMI
• Debugging With Windows-Hosted Emulation
• Q & A
UEFI Plugfest – July 2011 www.uefi.org 2
Introduction
• Problem: UEFI BIOS is a tough development environment.– Developed before hardware available. Often
have to code blind.– Tough to debug. How to log output, set
breakpoints.– Time consuming to debug. Long turn-around
time to update.– How to unit test corner cases? Touching
hardware crashes the system.
UEFI Plugfest – July 2011 www.uefi.org 3
Introduction (2)
• Solution: Develop UEFI BIOS in an emulated hardware environment.– WinHost (Phoenix) or Nt32Pkg (TianoCore) offer an
emulated UEFI environment running under Windows operating systems.
– Provides UEFI abstractions for many Windows hardware resources (disk, serial, network)
– Quick-turn around and excellent debug support using Visual Studio.
• Real-Life Solution: How Phoenix used WinHost to develop ASF, DASH and IPMI using an emulated SMBus Host Controller.
UEFI Plugfest – July 2011 www.uefi.org 4
What Is SMBus?
• SMBus is a low-power 2-wire multi-master bus built on top of I2C.
– Well-defined transport.
– Addressable.
– UDID gives vendor/device id similar to PCI.
• Used as the backbone of numerous platform management standards:
– ASF, DASH, IPMI
UEFI Plugfest – July 2011 www.uefi.org 5
CPU
SMBus Host Controller
Temperature
Sensor
Fan Motor
Voltage
Sensor
Managemen
t Controller
SMBus
PCIe Slot
How Does UEFI Support SMBus?
• The UEFI PI Specification’s SMBus Host Controller protocol abstracts differences in hardware interface.
UEFI Plugfest – July 2011 www.uefi.org 6
typedef struct _EFI_SMBUS_HC_PROTOCOL {
EFI_SMBUS_HC_EXECUTE_OPERATION Execute;
EFI_SMBUS_HC_PROTOCOL_ARP_DEVICE ArpDevice;
EFI_SMBUS_HC_PROTOCOL_GET_ARP_MAP GetArpMap;
EFI_SMBUS_HC_PROTOCOL_NOTIFY Notify;
} EFI_SMBUS_HC_PROTOCOL;
What Was Missing?
• The UEFI Driver Model!
UEFI Plugfest – July 2011 www.uefi.org 7
What Was Missing?
• The UEFI Driver Model!
UEFI Plugfest – July 2011 www.uefi.org 8
What Was Missing?
• The UEFI Driver Model!
UEFI Plugfest – July 2011 www.uefi.org 9
What Was Missing?
• The UEFI Driver Model!
UEFI Plugfest – July 2011 www.uefi.org 10
What Was Missing?
• The UEFI Driver Model!
UEFI Plugfest – July 2011 www.uefi.org 11
How To Integrate SMBus HostController Into UEFI Driver Model?
• Added Driver Binding Protocol.
• Added Device Path Protocol.
• Added Means To Connect Non-Boot Devices.
–By default, Boot Manager only connected console input, output and boot devices.
UEFI Plugfest – July 2011 www.uefi.org 12
Adding ASF, DASH and IPMI
UEFI Plugfest – July 2011 www.uefi.org 13
• With SMBus in UEFI driver model, standards like ASF, DASH and IPMI fit in naturally.
ASD
OS
/
AP
PS
SY
ST
EM
SIL
ICO
NH
AR
DW
AR
ESMBus Host Controller
SMBus I/O
ASF Bus
ASF I/O
ASF & SMBus
Sensor
Drivers
BMCASF Sensors
SMBus
Sensor
Device Path
Driver Binding
HII Forms
SMBus Bus
SMBus Host Controller
ASF ASD
Driver
ASF ASD
HII
Database
Setup
Emulate Host Controller
UEFI Plugfest – July 2011 www.uefi.org 14
• By emulating one driver, we could test and debug our ASF, DASH and IPMI stack w/o hardware.
• Easy to test setup pages, sensors, boot options, SMBIOS push and error conditions.
SMBus Host Controller Driver Architecture
UEFI Plugfest – July 2011 www.uefi.org 15
Common Unit Test Debug Scenarios
UEFI Plugfest – July 2011 www.uefi.org 16
• Device Enumeration for Devices That:–Are not enumerable (ARP)
–Don’t identify themselves well.
• Error Check For Devices That:–Return ill-formed packets.
–Don’t support specific commands.
• Return Different SMBIOS Tables, Boot Options and Other Items.
Debug Using Messages or Breakpoints!
• Dump out enumeration information.
UEFI Plugfest – July 2011 www.uefi.org 17
Debug Using Messages or Breakpoints!
• View how commands are translated from DASH to SMBus.
UEFI Plugfest – July 2011 www.uefi.org 18
Debug Using Messages or Breakpoints!
• View how commands are translated from DASH to SMBus.
UEFI Plugfest – July 2011 www.uefi.org 19
Conclusion
UEFI Plugfest – July 2011 www.uefi.org 20
• Device Emulation Speeds Development.
• Better debug & log capabilities.
• Better unit test case.
–Once a unique device found, model it in software for regression tests.
Q & A
UEFI Plugfest – July 2011 www.uefi.org 21
Thanks for attending the UEFI Summer Plugfest 2011
For more information on the Unified EFI Forum and UEFI Specifications, visit http://www.uefi.org
presented by
UEFI Plugfest – July 2011 www.uefi.org 22
But wait, there’s more …
UEFI Plugfest – July 2011 www.uefi.org 23
Wed(July 6)
• UEFI State of the Union (10:30am, Intel)
• Implementing a Secure Boot Path with UEFI 2.3.1 (1:00pm, Insyde)
• UEFI SCT Overview (2:30pm, HP/Intel)
Thu(July 7)
• Replacing VGA: GOP Implementation in UEFI (10:30am, AMD)
• UEFI prototyping using a Windows-hosted UEFI environment (1:00pm, Phoenix)
• EFI Shell Lab (2:00-4:00pm, “Thunder”, Intel)
• GOP Enabling & Testing Lab (4:30—5:30pm, “Thunder”, Intel)
Fri(July 8)
• Best Practices for UEFI Option ROM Developers (10:30am, AMI)
Download presentations after the plugfest at www.uefi.org
Backup
UEFI Plugfest – July 2011 www.uefi.org 24
SMBus I/O Protocol
UEFI Plugfest – July 2011 www.uefi.org 25
extern EFI_GUID gSctSmbusIoProtocolGuid;
typedef struct _SCT_SMBUS_IO_PROTOCOL {
UINT32 Size;
EFI_SMBUS_ADDRESS Addr;
SCT_SMBUS_IO_IDENTIFY Identify;
SCT_SMBUS_IO_EXECUTE Execute;
} SCT_SMBUS_IO_PROTOCOL, *PSCT_SMBUS_IO_PROTOCOL;
ASF I/O Protocol
UEFI Plugfest – July 2011 www.uefi.org 26
extern EFI_GUID gSctAsfIoProtocolGuid;
typedef struct _SCT_ASF_IO_PROTOCOL {
UINT32 Size;
SCT_ASF_IO_SEND_MSG SendMessage;
} SCT_ASF_IO_PROTOCOL, *PSCT_ASF_IO_PROTOCOL;
DASH MCTP I/O Protocol
UEFI Plugfest – July 2011 www.uefi.org 27
extern EFI_GUID gSctMctpIoProtocolGuid;
typedef struct _SCT_MCTP_IO_PROTOCOL {
UINT32 Size;
MCTP_EID Eid;
MCTP_MEDIUM Medium;
SCT_MCTP_SEND_MSG SendMessage;
} SCT_MCTP_IO_PROTOCOL, *PSCT_MCTP_IO_PROTOCOL;
IPMI I/O Protocol
UEFI Plugfest – July 2011 www.uefi.org 28
extern EFI_GUID gSctIpmiProtocolGuid;
typedef struct _SCT_IPMI_IO_PROTOCOL {
UINT32 Size;
SCT_IPMI_SEND_REQUEST SendRequest;
} SCT_IPMI_IO_PROTOCOL, *PSCT_IPMI_IO_PROTOCOL;
References
• System Management Bus (SMBus) Specification, Version 2.0, August 3, 2000
• UEFI Specification, Version 2.3.1, April 6, 2011
• Platform Initialization (PI) Specification, Volume 5, Version 1.2, May 13, 2009
UEFI Plugfest – July 2011 www.uefi.org 29
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