[LEDE-DEV] Adding support for dlink dwr-512

[Giuseppe Lippolis]

Hi all,
I'm trying to port lede to the dwr-512.
I'm using the latest trunk downloaded with 
git clone https://git.lede-project.org/source.git

The dwr-512 oem bootloader accept a firmware image that shall be processed
with a dlink tool called binboy and need the binary_kernel_image (lzma
compressed) + the sqashfs_root. 
In addition, using the oem bootloader, I'm unable to pass kernel param and
device tree.

More detail here: https://wiki.openwrt.org/inbox/d-link/d-link_dwr-512_b in
the section FW installation.

I start some discussion in the bug report but I realize it is better to use
the mailing list.
According with the latest advice of Mathias Kresin I should use the default
strategy to generate an Image, therefore I add the following path:

diff --git a/target/linux/ramips/image/rt305x.mk
b/target/linux/ramips/image/rt305x.mk
index be21ac4..e830675 100644
--- a/target/linux/ramips/image/rt305x.mk
+++ b/target/linux/ramips/image/rt305x.mk
@@ -168,6 +168,13 @@ endef
 TARGET_DEVICES += dir-620-d1


+define Device/dwr-512-b
+  DTS := DWR-512-B
+  DEVICE_TITLE := D-Link DWR-512 B
+endef
+TARGET_DEVICES += dwr-512-b
+
+
 define Device/esr-9753
   DTS := ESR-9753
   BLOCKSIZE := 64k

Then I add the dwr-512-b in the
/target/linux/ramips/base-files/lib/ramips.sh
b/target/linux/ramips/base-files/lib/ramips.sh and in
target/linux/ramips/base-files/etc/board.d/02_network
b/target/linux/ramips/base-files/etc/board.d/02_network and, clearly, I add
the device tree file target/linux/ramips/dts/DWR-512-B.dts:

/dts-v1/;

/include/ "rt5350.dtsi"

/ {
        compatible = "ralink,rt5350-soc";
        model = "D-Link DWR-512";

        memory at 0 {
                device_type = "memory";
                reg = <0x0 0x2000000>;
        };

        palmbus at 10000000 {
                spi at b00 {
                        status = "okay";
                        mx25l6405d at 0 {
                                #address-cells = <1>;
                                #size-cells = <1>;
                                compatible = "macronix,mx25l6405d",
"jedec,spi-nor";
                                reg = <0>;
                                spi-max-frequency = <30000000>;
                                                                fast-read;

                                partition at 0 {
                                        label = "bootloader";
                                        reg = <0x0 0x10000>;
                                        read-only;
                                };

                                partition at 10000 {
                                        label = "Kernel";
                                        reg = <0x10000 0x140000>;
                                        read-only;
                                };

                                partition at 150000 {
                                        label = "rootfs";
                                        reg = <0x150000 0x5c0000>;
                                        read-only;
                                };

                                partition at 710010 {
                                        label = "ui";
                                        reg = <0x710000 0xe0000>;
                                };

                                partition at 7f0000 {
                                        label = "config";
                                        reg = <0x7f0000 0x10000>;
                                };

                        };
                };
                uart: uart at 500 {
                        status = "okay";
                };
        };

After the compilation in the bin/targets/ramips/rt305x/, I get:

   2544 Oct  2 11:12 lede-ramips-rt305x-device-dwr-512-b.manifest
2892686 Oct  2 11:12 lede-ramips-rt305x-dwr-512-b-initramfs-kernel.bin
3145732 Oct  2 11:12 lede-ramips-rt305x-dwr-512-b-squashfs-sysupgrade.bin
1835008 Oct  2 11:12 lede-ramips-rt305x-root.squashfs
2891100 Oct  2 11:12 lede-ramips-rt305x-uImage-initramfs.bin
1201869 Oct  2 11:12 lede-ramips-rt305x-uImage.bin
5460316 Oct  2 11:12 lede-ramips-rt305x-vmlinux-initramfs.bin
5465328 Oct  2 11:12 lede-ramips-rt305x-vmlinux-initramfs.elf
3792868 Oct  2 11:12 lede-ramips-rt305x-vmlinux.bin
3797880 Oct  2 11:12 lede-ramips-rt305x-vmlinux.elf

I do not seems that I get the kernel image I was looking for.
It seems that I get the lede-ramips-rt305x-dwr-512-b-initramfs-kernel.bin
but embedding the initramfs is not an option, the size is too big.

Some advices?

Thanks and bye.