ipq40xx: Add support for Unielec U4019

This commit adds support for the 32MB storage/512MB RAM version of the U4019
IPQ4019-based board from Unielec. The board has the following specifications:

* Qualcomm IPQ4019 (running at 717MHz)
* 512MB DDR3 RAM (optional 256MB/1GB)
* 32MB SPI NOR (optional 8/16MB or NAND)
* Five gigabit ports (Qualcomm QCA8075)
* 1x 2.4 GHz wifi (QCA4019 hw1.0)
* 1x 5 Ghz wifi (QCA4019 hw1.0)
* 1x mini-PCIe slot (only USB-pins connected)
* 1x SIM slot (mini-SIM)
* 1x USB2.0 port
* 1x button
* 1x controllable LED
* 1x micro SD-card reader

Working:
* Ethernet
* Wifi
* USB-port
* mini-PCIe slot + SIM slot
* Button
* Sysupgrade

Not working:
* SD card slot (no upstream support)

Installation instructions:

In order to install OpenWRT on the U4019, you need to go via the
initramfs-image. The installation steps are as follows:

* Connect to board via serial (header exposed and clearly marked).
* Interrupt bootloader by pressing a button.
* Copy the initramfs-image to your tftp folder, call the file C0A80079.img.
* Give the network interface connected to the U4019 the address
192.168.0.156/24.
* Start your tftp-server and run tftpboot on the board.
* Run bootm when the file has been transferred, to boot OpenWRT.
* Once OpenWRT has booted, copy the sysupgrade-image to the device and run
sysupgrade to install OpenWRT on the U4019.

Notes:

- Since IPQ4019 has been moved to 4.19, I have not added support for kernel
4.14.

- There is a bug with hardware encryption on IPQ4019, causing poor performance
with TCP and ipsec (see for example FS#2355). In order to improve performance,
I have disabled hardware encryption in the DTS. We can enable hw. enc. once/if
bug is fixed.

- In order for Ethernet to work, the phy has to be reset by setting gpio 47
low/high. Adding support for phy reset via gpio required patching the
mdio-driver, and the code added comes from the vendor driver. I do not know if
patching the driver is an acceptable approach or not.

v1->v2:
* Do not use wildcard as identifier in the board.d-scripts (thanks
Adrian Schmutzler).

Signed-off-by: Kristian Evensen <kristian.evensen@gmail.com>

1 files changed, 10 insertions, 5 deletions

diff --git a/target/linux/ipq40xx/patches-4.19/901-arm-boot-add-dts-files.patch b/target/linux/ipq40xx/patches-4.19/901-arm-boot-add-dts-files.patch
index a0386f6b66..aa4c0f2e6f 100644
--- a/target/linux/ipq40xx/patches-4.19/901-arm-boot-add-dts-files.patch
+++ b/target/linux/ipq40xx/patches-4.19/901-arm-boot-add-dts-files.patch
@@ -1,16 +1,18 @@
-From 8f68331e14dff9a101f2d0e1d6bec84a031f27ee Mon Sep 17 00:00:00 2001
+From a10fab12a927e60b7141a602e740d70cb4d09e4a Mon Sep 17 00:00:00 2001
 From: John Crispin <john@phrozen.org>
 Date: Thu, 9 Mar 2017 11:03:18 +0100
-Subject: [PATCH 69/69] arm: boot: add dts files
+Subject: [PATCH] arm: boot: add dts files
 
 Signed-off-by: John Crispin <john@phrozen.org>
 ---
- arch/arm/boot/dts/Makefile | 8 ++++++++
- 1 file changed, 8 insertions(+)
+ arch/arm/boot/dts/Makefile | 23 +++++++++++++++++++++++
+ 1 file changed, 23 insertions(+)
 
+diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
+index b5bd3de87..5a52a0b19 100644
 --- a/arch/arm/boot/dts/Makefile
 +++ b/arch/arm/boot/dts/Makefile
-@@ -785,11 +785,33 @@ dtb-$(CONFIG_ARCH_QCOM) += \
+@@ -785,11 +785,34 @@ dtb-$(CONFIG_ARCH_QCOM) += \
  	qcom-apq8074-dragonboard.dtb \
  	qcom-apq8084-ifc6540.dtb \
  	qcom-apq8084-mtp.dtb \
@@ -38,9 +40,12 @@ Signed-off-by: John Crispin <john@phrozen.org>
 +	qcom-ipq4019-map-ac2200.dtb \
 +	qcom-ipq4019-qxwlan-e2600ac-c1.dtb \
 +	qcom-ipq4019-qxwlan-e2600ac-c2.dtb \
++	qcom-ipq4019-unielec-u4019-32m.dtb \
 +	qcom-ipq4028-wpj428.dtb \
 +	qcom-ipq4029-gl-b1300.dtb \
 +	qcom-ipq4029-mr33.dtb \
  	qcom-ipq8064-ap148.dtb \
  	qcom-msm8660-surf.dtb \
  	qcom-msm8960-cdp.dtb \
+--
+2.20.1