EFI/UEFI Shell 的常用命令列表 Command list

早期Legacy BIOS會在DOS環境下, 透過指令方式, 或集結成批次檔 *.bat 以完成特定的自動化需求; 現在推動UEFI環境, 這是Built-in的 EFI shell, 要自動化也是需要批次檔 *nsh

當系統開機到 EFI shell時, 此時嵌入式作業系統會透過搜尋已定義好的path 找尋此檔 startup.nsh, 所以基本上來說Startup.nsh相當於DOS/Windows環境下的autoexec.bat，當跑完這個startup script之後, 會顯示如下的指令提示介面: (翻譯引用自Intel文件:Basic Instructions for Using the Extensible Firmware Interface (EFI))
Shell>

下表引用自UEFI和Legacy BIOS的差異

	Legacy BIOS	UEFI
發明年代	1975 by IBM	2002 by Intel
程式語言	組合語言	C語言
CPU mode	16-bit mode(Real mode)	32/64-bit mode(Flat mode)
記憶體定址空間	~1 MB	>4 GB
支援硬碟分割格式	MBR	GPT
支援硬碟最大容量	~2 TB	~9 ZetaBytes
支援硬碟主分割區數量	4	128
Boot Speed	慢	快
Boot Manager	Boot loader in MBR	Boot loaders in ESP
硬體擴充方式	Option ROM	EFI driver
硬體資源控制	Interrupt	Protocol/Driver
安全機制	TPM	Secure Boot
VGA BIOS	VBIOS	GOP
Bootable USB Flash drive	DOS	EFI Shell

統一可延伸韌體介面（Unified Extensible Firmware Interface, UEFI）是一種個人電腦系統規格，用來定義作業系統與系統韌體之間的軟體介面，作為BIOS的替代方案。可延伸韌體介面負責加電自檢（POST）、連繫作業系統以及提供連接作業系統與硬體的介面。(參考自wiki)

可擴展韌體介面在軟體堆疊裡的位置

EFI開機管理員與 EFI drivers的溝通方式

EFI/UEFI Shell Command

列出EFI/UEFI 裡面 EFI Shell界面支持的命令。
對這些命令無法執行或出錯，在EFI shell提示符下輸入help命令。

可以使用的一些命令如下：

“Boot Commands — EFI Shell”.
“Configuration Commands — EFI Shell”.
“Device, Driver, and Handle Commands — EFI Shell”.
“Filesystem Commands — EFI Shell”.
“Memory Commands — EFI Shell”.
“Shell Navigation and Other Commands — EFI Shell”.
“Shell Script Commands / Programming Constructs — EFI Shell”.

Command	Description
Boot Commands — EFI Shell. Commands related to nPartition booting. n分區啟動的相關命令
autoboot	Set/view autoboot timeout variable.
bcfg	Display/modify the driver/boot configuration.
boottest	Set/view BootTest bits.
dbprofile	Display/modify direct boot profiles for use by lanboot.
lanboot	Boot over the LAN.
reconfigreset	Reset the system (nPartition) for reconfiguration; the nPartition remains inactive, in the shutdown for reconfig state.
reset	Reset the system (nPartition).
search	Connect drivers for bootables devices.
Configuration Commands — EFI Shell. Commands for changing and retrieving system (nPartition) information.
acpiconfig	Set/view ACPI configuration mode.
cellconfig	Deconfigure/reconfigure cells. (Set cell use-on-next-boot values.)
cpuconfig	Deconfigure/reconfigure processors and processor cores..
date	Display the current date or set the date of the system (nPartition).
dimmconfig	Deconfigure/reconfigure memory (DIMMs).
err	Display/change the error level.
errdump	View/clear logs.
fru	View FRU data.
info	Display hardware information.
monarch	Set/view a monarch processor.
palproc	Make a PAL call.
romdrivers	Enable/disable PCI expansion ROM drivers.
rootcell	Set/view preferred root cells. (Set nPartition core cell choices.)
salproc	Make a SAL call.
tftp	Performs TFTP operation to a bootp/DHCP enabled Unix boot server.
time	Display the current time or set the time of the system (nPartition). EFI time is set and presented in GMT (Greenwich mean time).
variable	Save/restore specific EFI variables.
ver	Display the version information.
Device, Driver, and Handle Commands — EFI Shell. Commands for managing devices, drivers, and handles.
baud	View serial port com settings.
connect	Bind a driver to a device.
dblk	Hex dump of BlkIo devices.
devices	Display devices managed by EFI drivers.
devtree	Display tree of devices.
dh	Dump handle info.
disconnect	Disconnect driver(s) from device(s).
drivers	Display list of drivers.
drvcfg	Invoke the Driver Config Protocol.
drvdiag	Invoke the Driver Diagnostics Protocol.
guid	Dump known GUID IDs.
lanaddress	Display MAC address.
load	Load EFI drivers.
map	Map shortname to device path.
openinfo	Display the open protocols for given handle.
pci	Display PCI devices or PCI function configuration space.
reconnect	Reconnect driver(s) from a device.
unload	Unload a protocol image.
Filesystem Commands — EFI Shell. Commands for managing files, directories, and attributes.
attrib	Display/change the attributes of files/directories.
cd	Update/view the current directory.
comp	Compare the contents of two files.
cp	Copy one or more files/directories to another location.
edit	Edit an ASCII or UNICODE file in full screen.
eficompress	Compress infile and write to outfile.
efidecompress	Decompress infile and write to outfile.
hexedit	Edit a file, block device, or memory region using hex.
ls	Display a list of files and subdirectories in a directory.
mkdir	Create one or more directories.
mount	Mount a filesystem on a block device.
rm	Delete one or more files/directories.
setsize	Set the size of a file.
touch	Update time of file/directory with current time.
type	Display the contents of a file.
vol	Display volume information of the file system.
Memory Commands — EFI Shell. Commands for listing and managing memory, EFI variables, and NVRAM details.
default	Set the default NVRAM values.
dmem	Dump memory or memory mapped IO.
dmpstore	Display all EFI variables.
memmap	Display the memory map.
mm	Display/modify MEM/IO/PCI.
pdt	View/clear nPartition or cell memory page deallocation table (PDT).
Shell Navigation and Other Commands — EFI Shell. Commands for basic EFI Shell navigation and customization.
alias	Set/get alias settings.
cls	Clear the standard output with an optional background color.
exit	Exit EFI Shell environment.
getmtc	Display current monotonic counter value.
help or ?	Display help.
mode	Display the mode of the console output device.
set	Set/Get environment variable.
xchar	Turn on/off extended character features.
Shell Script Commands / Programming Constructs — EFI Shell. EFI shell-script commands.
echo	Echo message to stdout or toggle script echo.
else	Script-only: Use with IF THEN.
endfor	Script-only: Delimiter for FOR loop construct.
endif	Script-only: Delimiter for IF THEN construct.
for	Script-only: Loop construct.
goto	Script-only: Jump to label location in script.
if	Script-only: IF THEN construct.
input	Take user input and place in EFI variable.
pause	Script-only: Prompt to quit or continue.
stall	Stall the processor for some microseconds.

其他指令

STALL (以微秒為單位的延遲)

Note:
1. STALL in emulation NT environment will sleep for ‘microseconds’.
2. STALL in some other platforms will wait for ‘microseconds’.
3. Microseconds is in decimal units.
Examples:
Shell> stall 1000000 //表示Stall for 1000000 uS

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