diff --git a/general/package/ipctool/ipctool.mk b/general/package/ipctool/ipctool.mk
index f94c912e78..8239c87c6e 100644
--- a/general/package/ipctool/ipctool.mk
+++ b/general/package/ipctool/ipctool.mk
@@ -14,6 +14,88 @@ IPCTOOL_INSTALL_STAGING = YES
 IPCTOOL_CONF_OPTS += -DBUILD_SHARED_LIBS=ON -DCMAKE_BUILD_TYPE=Release -DSKIP_VERSION=ON
 IPCTOOL_MAKE_OPTS += VERBOSE=1
 
+# ipcinfo links libipchw, which knows every SoC vendor and every HiSilicon
+# generation ipctool has ever learned: a detection table for eleven vendor
+# HALs, and a chip-ID table, a sensor-bus back-end, a temperature formula and
+# a die-ID reader for each of ten HiSilicon generations. A camera is one SoC.
+# The rest is code that cannot execute on it, and it ships on all but three of
+# this tree's board configs, onto boards whose rootfs cap leaves tens of KB
+# spare.
+#
+# Upstream takes both as ;-separated build options defaulting to "all"
+# (ipctool #178 and #211). majestic already derives them the same way, from
+# its VENDOR and SDK code -- see majestic's CMakeLists.txt. Nothing here
+# derives IPCHW_SENSORS: a mainline image is per-family and gets flashed onto
+# whatever camera someone bought, and ipcinfo --short-sensor exists to name a
+# sensor nobody catalogued. Compiling a probe family out turns that into
+# "SENSOR is not detected, aborting". IPCHW_PADMUX is left alone too -- gc
+# already drops it from ipcinfo, and libipchw carries its selection as a
+# PUBLIC compile definition, which would break config_tool in
+# sigmastar-osdrv-infinity6.
+#
+# An unmapped vendor or family passes nothing and keeps upstream's default, so
+# a new SoC is never silently trimmed to the wrong thing -- it just does not
+# benefit until someone maps it.
+
+# Which vendor HAL a board can reach. HiSilicon's is not optional upstream and
+# Goke is a HiSilicon derivative detected through the same path, so both ask
+# for none of the eleven.
+IPCTOOL_VENDORS_allwinner  = allwinner
+IPCTOOL_VENDORS_fullhan    = fh
+IPCTOOL_VENDORS_goke       = none
+IPCTOOL_VENDORS_grainmedia = gm
+IPCTOOL_VENDORS_hisilicon  = none
+IPCTOOL_VENDORS_ingenic    = ingenic
+IPCTOOL_VENDORS_novatek    = novatek
+IPCTOOL_VENDORS_rockchip   = rockchip
+IPCTOOL_VENDORS_sigmastar  = sstar
+IPCTOOL_VENDORS_xiongmai   = xm
+
+# Which HiSilicon generation, by family. These names are not a coincidence:
+# ipctool's getchipfamily() returns the same strings, so `ipcinfo -f` on a
+# board prints the key this table is indexed by.
+IPCTOOL_HISI_gk7205v200  = v4
+IPCTOOL_HISI_gk7205v500  = v4
+IPCTOOL_HISI_hi3516av100 = v2a
+IPCTOOL_HISI_hi3516cv100 = v1
+IPCTOOL_HISI_hi3516cv200 = v2
+IPCTOOL_HISI_hi3516cv300 = v3
+IPCTOOL_HISI_hi3516cv500 = v4a
+IPCTOOL_HISI_hi3516cv6xx = v5
+IPCTOOL_HISI_hi3516ev200 = v4
+IPCTOOL_HISI_hi3519dv500 = v5
+IPCTOOL_HISI_hi3519v101  = v3a
+IPCTOOL_HISI_hi3536cv100 = 3536c
+IPCTOOL_HISI_hi3536dv100 = 3536d
+
+# A vendor that is not HiSilicon reaches hal_hisi through nothing: the only
+# route is a HiSilicon UART0 base in chipid.c's dispatch. Dropping it takes
+# hal_hisi.c and ispreg.c out of the library altogether.
+#
+# hi3520dv200 and gk710x are deliberately absent from the table above. The
+# 3520DV200 ID sets no chip_generation at all, and no ID in ipctool's table
+# matches a GK7101/GK7102, so neither has a generation to name -- they keep
+# every one rather than be trimmed on a guess.
+IPCTOOL_HISI_VENDOR_allwinner  = none
+IPCTOOL_HISI_VENDOR_fullhan    = none
+IPCTOOL_HISI_VENDOR_grainmedia = none
+IPCTOOL_HISI_VENDOR_ingenic    = none
+IPCTOOL_HISI_VENDOR_novatek    = none
+IPCTOOL_HISI_VENDOR_rockchip   = none
+IPCTOOL_HISI_VENDOR_sigmastar  = none
+IPCTOOL_HISI_VENDOR_xiongmai   = none
+
+IPCTOOL_IPCHW_VENDORS = $(IPCTOOL_VENDORS_$(OPENIPC_SOC_VENDOR))
+IPCTOOL_IPCHW_HISI = $(or $(IPCTOOL_HISI_$(OPENIPC_SOC_FAMILY)),\
+	$(IPCTOOL_HISI_VENDOR_$(OPENIPC_SOC_VENDOR)))
+
+ifneq ($(IPCTOOL_IPCHW_VENDORS),)
+IPCTOOL_CONF_OPTS += -DIPCHW_VENDORS=$(IPCTOOL_IPCHW_VENDORS)
+endif
+ifneq ($(IPCTOOL_IPCHW_HISI),)
+IPCTOOL_CONF_OPTS += -DIPCHW_HISI=$(IPCTOOL_IPCHW_HISI)
+endif
+
 define IPCTOOL_INSTALL_STAGING_CMDS
 	$(INSTALL) -m 755 -t $(STAGING_DIR)/usr/lib $(@D)/libipchw.a
 endef