devmem3

buildroot_config_fragment

@@ -70,3 +70,32 @@ BR2_PACKAGE_HOST_DTC=y
 # TODO: have a look at: https://github.com/kaiwan/device-memory-readwrite
 #
 BR2_PACKAGE_DEVMEM2=y
+
+# Provides setpci and a lspci more advanced than Busybox's
+#
+# setpci can read and write to PCI configuration registers.
+#
+# Read is possible from Linux with:
+#
+#     hexdump /sys/bus/pci/devices/0000:00:05.0/config
+#
+# but setpci provies nice human readable register names, e.g.:
+#
+#     setpci --dumpregs
+#
+# then and then get the values with either bus or device id:
+#
+#     setpci -s 0000:00:05.0 BASE_ADDRESS_0
+#     setpci -d 1234:11e9 BASE_ADDRESS_0
+#
+# Note however that BASE_ADDRESS_0 also appears when you do:
+#
+#     lspci -v
+#
+# Then you can try messing with that address with:
+#
+#     devmem2 0xfeb52000 w 0x12345678
+#
+# which for our pci_min device fires interrupts.
+#
+BR2_PACKAGE_PCIUTILS=y