DTC compile error (simple-bus unit address format error for #address-cells = <2> case)

Chan Kim ckim at etri.re.kr
Wed Oct 27 07:57:39 EDT 2021


I've found how to do it.

For you should add CONFIG_ARCH_VEXPRESS and ran 'make V=1 ARCH=arm64
CROSS_COMPILE=aarch64-none-elf- dtbs |& tee logx'

Dtbs for ARCH_VEXPRESS are generated in the dts directory. Then you can see
the command to make the dtb (in the logx file). 

Below is the command. Lots of options for the dtc.


mkdir -p arch/arm64/boot/dts/arm/ ; gcc -E
-Wp,-MD,arch/arm64/boot/dts/arm/.fvp-base-revc.dtb.d.pre.tmp -nostdinc
-I./scripts/dtc/include-prefixes -undef -D__DTS__ -x assembler-with-cpp -o
arch/arm64/boot/dts/arm/fvp-base-revc.dts ; ./scripts/dtc/dtc -O dtb -o
arch/arm64/boot/dts/arm/fvp-base-revc.dtb -b 0 -iarch/arm64/boot/dts/arm/
-i./scripts/dtc/include-prefixes -Wno-unit_address_vs_reg
-Wno-unit_address_format -Wno-avoid_unnecessary_addr_size -Wno-alias_paths
-Wno-graph_child_address -Wno-simple_bus_reg -Wno-unique_unit_address
-Wno-pci_device_reg  -d arch/arm64/boot/dts/arm/.fvp-base-revc.dtb.d.dtc.tmp
arch/arm64/boot/dts/arm/.fvp-base-revc.dtb.dts.tmp ; cat
arch/arm64/boot/dts/arm/.fvp-base-revc.dtb.d.dtc.tmp >



Chan Kim


From: Chan Kim <ckim at etri.re.kr> 
Sent: Wednesday, October 27, 2021 6:45 PM
To: kernelnewbies at kernelnewbies.org
Subject: DTC compile error (simple-bus unit address format error for
#address-cells = <2> case)


Hello all,

Below is a part of arch/arm64/boot/dts/arm/rtsm_ve-motherboard.dtsi in linux
kernel. This file is included by arch/arm64/boot/dts/arm/fvp-base-revc.dts.


/ {

    smb at 8000000 {

        motherboard {

            arm,v2m-memory-map = "rs1";

            compatible = "arm,vexpress,v2m-p1", "simple-bus";

            #address-cells = <2>; /* SMB chipselect number and offset */

            #size-cells = <1>;

            #interrupt-cells = <1>;



            flash at 0,00000000 {

                compatible = "arm,vexpress-flash", "cfi-flash";

                reg = <0 0x00000000 0x04000000>,

                      <4 0x00000000 0x04000000>;

                bank-width = <4>;



            ethernet at 2,02000000 {

                compatible = "smsc,lan91c111";

                reg = <2 0x02000000 0x10000>;

                interrupts = <15>;



When I compile the fvp-base-revc.dts file 

(following this method to handle pre-processing :
izes-c-syntax-for-include-files), it gives me error below.


arch/arm64/boot/dts/arm/rtsm_ve-motherboard.dtsi:20.21-25.6: Warning
(simple_bus_reg): /smb at 8000000/motherboard/flash at 0,00000000: simple-bus unit
address format error, expected "0"

arch/arm64/boot/dts/arm/rtsm_ve-motherboard.dtsi:27.24-31.6: Warning
(simple_bus_reg): /smb at 8000000/motherboard/ethernet at 2,02000000: simple-bus
unit address format error, expected "202000000"


The dtc is complaining about the address format `flash at 0,00000000` or
`ethernet at 2,02000000`. 

But because the #address-cells = <2>, the node address should be given by
chip select number and the offset (inside the chip select). 

How can I prevent this error? DTC version is 1.5.0.


Any help will be appreciated.

Thank you!

Chan Kim


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