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openwrt/target/linux
Kristian Evensen 4def81f30f mediatek: Add support for the UniElec U7623-02
This commit adds support for the MT7623A-based UniElec U7623-02 router,
with eMMC storage and 512MB RAM. The router can be delivered with NAND
Flash and more memory, but I only have access to the one configuration.
The DTS is structured in such a way that adding support for
more/different storage/memory should be straight forward.

The device has the following specifications:

* MT7623A (quad-core, 1.3 GHz)
* 512MB RAM (DDR3)
* 8GB storage (eMMC 4.5)
* 2x normal miniPCIe slots
* 1x miniPCIe slot that is connected via an internal USB OTG port
* 5x 1Gbps Ethernet (MT7530 switch)
* 1x UART header
* 1x USB 3.0 port
* 1x SATA 3.0
* 1x 40P*0.5mm FPC for MIPI LCD
* 1x SIM slot
* 12x LEDs (2 GPIO controlled)
* 1x reset button
* 1x DC jack for main power (12V)

The following has been tested and is working:
* Ethernet switch
* miniPCIe slots (tested with Wi-Fi cards)
* USB 3.0 port
* sysupgrade
* reset button

Not working:
* The miniPCIe connected via USB OTG. For the port to work, some MUSB
glue must be added. I am currently in the process of porting the glue
from the vendor SDK.

Not tested:
* SATA 3.0
* MIPI LCD

Installation:

The board ships with u-boot, and the first installation needs to be done
via the bootloader using tftp. Step number one is to update the MBR of
the eMMC, as the one that ships with the device is broken. Since the
device can ship with different storage sizes, I will not provide the
exact steps for creating a valid MBR. However, I have made some
assumptions about the disk layout - there must be one 8MB recovery
partition (FAT32) and a partition for the rootfs (Linux).

The board loads the kernel from block 0xA00 (2560) and I have reserved
32MB for the kernel (65536 blocks). I have aligned the partitions on the
erase block size (4096 byte), so the recovery partition must start on
block 69632 and end on 86016 (16385 sectors). The rootfs is assumed to
start on sector 90112.

In order to install the mbr, you run the following commands from the
u-boot command line:

* tftpboot ${loadaddr} <name of mbr file>
* mmc device 0
* mmc write ${loadaddr} 0x00 1

Run the following commands to install + boot OpenWRT:

* tftpboot ${loadaddr} openwrt-mediatek-mt7623-7623a-unielec-u7623-02-emmc-512m-squashfs-sysupgrade-emmc.bin.gz
* run boot_wr_img
* run boot_rd_img
* bootm

Recovery:

In order to recover the router, you need to follow the installation
steps above (no need to replace MBR).

Notes:

* F2FS is used as the overlay filesystem.

* The device does not ship with any valid MAC address, so a random
address has to be generated. As a work-around, I write the initial
random MAC to a file on the recovery partition. The MAC of the WAN
interface is set to the MAC-address contained in this file on each boot,
and the address of the LAN-interfaces are WAN + 1. The MAC file is kept
across sysupgrade/firstboot.

My approach is slightly different than what the stock image does. The
first fives bytes of the MAC addresses in the stock image are static,
and then the last byte is random. I believe it is better to create fully
random MAC addresses.

* In order to support the miniPCIe-slots, I needed to add missing
pcie-nodes to mt7623.dtsi. The nodes are just c&p from the upstream
dtsi.

* One of the USB3.0 phys (u3phy2) on the board can be used as either USB
or PCI, and one of the wifi-cards is connected to this phy. In order to
support switching the phy from USB to PCI, I needed to patch the
phy-driver. The patch is based on a rejected (at least last time I
checked) PCI-driver submitted to the linux-mediatek mailing list.

* The eMMC is configured to boot from the user area, and according to
the data sheet of the eMMC this value can't be changed.

* I tried to structure the MBR more nicely and use for example a
FAT32-parition for the kernel, so that we don't need to write/read from
some offset. The bootloader does not support reading from
FAT32-paritions. While the command (fatload) is there, it just throws an
error when I try to use it.

* I will submit and hope to get the DTS for the device accepted
upstream. If and when that happens, I will update the patches
accordingly.

Signed-off-by: Kristian Evensen <kristian.evensen@gmail.com>
6 years ago
..
adm5120 kernel: mark all v3.18 and v4.4 kernels are source-only 6 years ago
adm8668 kernel: mark all v3.18 and v4.4 kernels are source-only 6 years ago
apm821xx kernel: bump 4.14 to 4.14.48 6 years ago
ar7 kernel: bump 4.9 to 4.9.100 6 years ago
ar71xx ar71xx: add support for TP-LINK Archer C7 v5 6 years ago
arc770 arc770: bump kernel to 4.14 6 years ago
archs38 kernel: enable THIN_ARCHIVES by default 6 years ago
armvirt arm64: enable harden branch predictor 6 years ago
at91 kernel: bump 4.9 to 4.9.100 6 years ago
ath25 ath25: drop 4.9 kernel support 6 years ago
ath79 ath79: ar934x: use irq-ath79-intc driver and enable wmac 6 years ago
au1000 kernel: mark all v3.18 and v4.4 kernels are source-only 6 years ago
bcm53xx bcm53xx: exit if writing kernel during sysupgrade fails 6 years ago
brcm47xx kernel: bump to 4.9.105 6 years ago
brcm63xx kernel: enable THIN_ARCHIVES by default 6 years ago
brcm2708 brcm2708: Add wifi driver, firmware and NVRAM for Raspberry Pi 3 b 6 years ago
cns3xxx kernel: enable THIN_ARCHIVES by default 6 years ago
gemini gemini: Cook SQ201 images 6 years ago
generic kernel: cleanup offload hooks on netdev unregister 6 years ago
imx6 kernel: enable THIN_ARCHIVES by default 6 years ago
ipq40xx ipq40xx: add support for ZyXEL WRE6606 6 years ago
ipq806x ipq806x: add support for NEC Aterm WG2600HP 6 years ago
ixp4xx kernel: bump to 4.9.105 6 years ago
kirkwood kernel: enable THIN_ARCHIVES by default 6 years ago
lantiq lantiq: fix arcadyan vg3503j switch port indexing 6 years ago
layerscape kernel: bump to 4.9.105 6 years ago
malta malta: bump tp v4.14 7 years ago
mcs814x kernel: mark all v3.18 and v4.4 kernels are source-only 6 years ago
mediatek mediatek: Add support for the UniElec U7623-02 6 years ago
mpc85xx kernel: bump to 4.9.105 6 years ago
mvebu mvebu: enable CONFIG_HW_RANDOM 6 years ago
mxs kernel: enable THIN_ARCHIVES by default 6 years ago
octeon octeon: Add and set CPU type Octeon+ as default 6 years ago
octeontx kernel: enable THIN_ARCHIVES by default 6 years ago
omap kernel: enable EXPORTFS by default 6 years ago
omap24xx omap24xx: remove referece to not existing kmod-usb-musb-tusb6010 7 years ago
orion orion: remove linux 4.4 support 6 years ago
oxnas kernel: bump 4.14 to 4.14.48 6 years ago
pistachio kernel: bump 4.14 to 4.14.42 6 years ago
ppc40x treewide: drop target board_name functions 7 years ago
ppc44x ppc44x: mark as broken 8 years ago
ramips ramips: Add support for Phicomm K2G 6 years ago
rb532 treewide: move nand_do_upgrade call to platform_do_upgrade 6 years ago
sunxi kernel: bump 4.9 to 4.9.108 6 years ago
uml kernel: bump 4.9 to 4.9.100 6 years ago
x86 kernel: bump 4.9 to 4.9.106 6 years ago
xburst kernel: mark all v3.18 and v4.4 kernels are source-only 6 years ago
zynq zynq: remove support for kernel 4.4 6 years ago
Makefile