busybox应该是有一个自带的简化版lspci，并不是完整的pciutils程序。

如果没有安装pciutils，默认lspci就是下面简化版的。

# lspci -h
lspci: invalid option -- 'h'
BusyBox v1.27.2 (2019-01-02 12:04:07 CST) multi-call binary.

Usage: lspci [-mk]

List all PCI devices

        -m      Parsable output
        -k      Show driver

# lspci
00:00.0 Class 0604: 16c3:abcd
01:00.0 Class 0200: 10ec:8168

busybox（buildroot）安装pciutils

make menuconfig

-> Target packages -> Hardware handling
  [*] pciutils 

重新make busybox-rebuild all，在make一下，新的rootfs里面就有完整版的lspci了

# lspci
00:00.0 PCI bridge: Synopsys, Inc. Device abcd (rev 01)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
# lspci --help
lspci: invalid option -- '-'
Usage: lspci [<switches>]

Basic display modes:
-mm             Produce machine-readable output (single -m for an obsolete format)
-t              Show bus tree

Display options:
-v              Be verbose (-vv for very verbose)
-k              Show kernel drivers handling each device
-x              Show hex-dump of the standard part of the config space
-xxx            Show hex-dump of the whole config space (dangerous; root only)
-xxxx           Show hex-dump of the 4096-byte extended config space (root only)
-b              Bus-centric view (addresses and IRQ's as seen by the bus)
-D              Always show domain numbers

Resolving of device ID's to names:
-n              Show numeric ID's
-nn             Show both textual and numeric ID's (names & numbers)

Selection of devices:
-s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]]   Show only devices in selected slots
-d [<vendor>]:[<device>][:<class>]              Show only devices with specified ID's

Other options:
-i <file>       Use specified ID database instead of /usr/share/pci.ids.gz
-p <file>       Look up kernel modules in a given file instead of default modules.pcimap
-M              Enable `bus mapping' mode (dangerous; root only)

PCI access options:
-A <method>     Use the specified PCI access method (see `-A help' for a list)
-O <par>=<val>  Set PCI access parameter (see `-O help' for a list)
-G              Enable PCI access debugging
-F <file>       Read PCI configuration dump from a given file