Huawei AP5030DN is a dual-band, dual-radio 802.11ac Wave 1 3x3 MIMO
enterprise access point with two Gigabit Ethernet ports and PoE
support.
Hardware highlights:
- CPU: QCA9550 SoC at 720MHz
- RAM: 256MB DDR2
- Flash: 32MB SPI-NOR
- Wi-Fi 2.4GHz: QCA9550-internal radio
- Wi-Fi 5GHz: QCA9880 PCIe WLAN SoC
- Ethernet 1: 10/100/1000 Mbps Ethernet through Broadcom B50612E PHY
- Ethernet 2: 10/100/1000 Mbps Ethernet through Marvell 88E1510 PHY
- PoE: input through Ethernet 1 port
- Standalone 12V/2A power input
- Serial console externally available through RJ45 port
- External watchdog: SGM706 (1.6s timeout)
Serial console:
9600n8 (9600 baud, no stop bits, no parity, 8 data bits)
MAC addresses:
Each device has 32 consecutive MAC addresses allocated by
the vendor, which don't overlap between devices.
This was confirmed with multiple devices with consecutive
serial numbers.
The MAC address range starts with the address on the label.
To be able to distinguish between the interfaces,
the following MAC address scheme is used:
- eth0 = label MAC
- eth1 = label MAC + 1
- radio0 (Wi-Fi 5GHz) = label MAC + 2
- radio1 (Wi-Fi 2.4GHz) = label MAC + 3
Installation:
0. Connect some sort of RJ45-to-USB adapter to "Console" port of the AP
1. Power up the AP
2. At prompt "Press f or F to stop Auto-Boot in 3 seconds",
do what they say.
Log in with default admin password "admin@huawei.com".
3. Boot the OpenWrt initramfs from TFTP using the hidden script
"run ramboot". Replace IP address as needed:
> setenv serverip 192.168.1.10
> setenv ipaddr 192.168.1.1
> setenv rambootfile
openwrt-ath79-generic-huawei_ap5030dn-initramfs-kernel.bin
> saveenv
> run ramboot
4. Optional but recommended as the factory firmware cannot
be downloaded publicly:
Back up contents of "firmware" partition using the web interface or ssh:
$ ssh root@192.168.1.1 cat /dev/mtd11 > huawei_ap5030dn_fw_backup.bin
5. Run sysupgrade using sysupgrade image. OpenWrt
shall boot from flash afterwards.
Return to factory firmware (using firmware upgrade package downloaded from
non-public Huawei website):
1. Start a TFTP server in the directory where
the firmware upgrade package is located
2. Boot to u-boot as described above
3. Install firmware upgrade package and format the config partitions:
> update system FatAP5X30XN_SOMEVERSION.bin
> format_fs
Return to factory firmware (from previously created backup):
1. Copy over the firmware partition backup to /tmp,
for example using scp
2. Use sysupgrade with force to restore the backup:
sysupgrade -F huawei_ap5030dn_fw_backup.bin
3. Boot AP to U-Boot as described above
Quirks and known issues
-----------------------
- On initial power-up, the Huawei-modified bootloader suspends both
ethernet PHYs (it sets the "Power Down" bit in the MII control
register). Unfortunately, at the time of the initial port, the kernel
driver for the B50612E/BCM54612E PHY behind eth0 doesn't have a resume
callback defined which would clear this bit. This makes the PHY unusable
since it remains suspended forever. This is why the backported kernel
patches in this commit are required which add this callback and for
completeness also a suspend callback.
- The stock firmware has a semi dual boot concept where the primary
kernel uses a squashfs as root partition and the secondary kernel uses
an initramfs. This dual boot concept is circumvented on purpose to gain
more flash space and since the stock firmware's flash layout isn't
compatible with mtdsplit.
- The external watchdog's timeout of 1.6s is very hard to satisfy
during bootup. This is why the GPIO15 pin connected to the watchdog input
is configured directly in the LZMA loader to output the CPU_CLK/4 signal
which keeps the watchdog happy until the wdt-gpio kernel driver takes
over. Because it would also take too long to read the whole kernel image
from flash, the uImage header only includes the loader which then reads
the kernel image from flash after GPIO15 is configured.
Signed-off-by: Marco von Rosenberg <marcovr@selfnet.de>
[fixed 6.6 backport patch naming]
Signed-off-by: David Bauer <mail@david-bauer.net>
This device only has 64 MiB RAM and ath10k wireless driver will
consume a lot of memory. Let's move it to the tiny sub-target to
get extra 7 MiB of free space. In this way, we can extend their
lifetime to receive support for the next OpenWrt LTS version. This
patch also trims the duplicate "recovery.bin" image as it's the
same as the "factory.bin".
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
These devices only have 64 MiB RAM and ath10k wireless driver will
consume a lot of memory. Let's move them to the tiny sub-target to
get extra 7 MiB of free space. In this way, we can extend their
lifetime to receive support for the next OpenWrt LTS version. This
patch also trims the USB package for the non-existent USB port.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
The upcoming D-Link devices to the tiny sub-target require it to
parse the u-env MAC address. The kernel size will increase by
about 1 KiB.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Move seama image recipe to the common Makefile in order for some
tiny sub-target D-Link devices can share it.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Add a hotplug script and add ttyATH1 on ELECOM WAB-I1750-PS to
/etc/inittab while booting for using that console as an OpenWrt console.
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Register ttyS0 and ttyATH1 as Linux console on ELECOM WAB-I1750-PS.
ttyS0 provides "SERVICE" port and internal pin header for debugging and
recoverying by maker, ttyATH1 provides "SERIAL" port for configuration
by users.
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
The 5.15 kenel config file, patches and version switches will be
removed in this patch. We will introduce kernel 6.6 support soon.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
The COVR-C1200 devices are sold as "Whole Home Mesh Wi-Fi"
sets in packs of two (COVR-C1202) and three (COVR-C1203).
Specifications:
* QCA9563, 16 MiB flash, 128 MiB RAM, 2x3:2 802.11n
* QCA9886 2x2:2 801.11ac Wave 2
* AR8337, 2 Gigabit ports (1: WAN; 2: LAN)
* USB Type-C power connector (5V, 3A)
Installation COVR Point A:
* In factory reset state: OEM Web UI is at 192.168.0.50
no DHCP, skip wizard by directly accessing:
http://192.168.0.50/UpdateFirmware_Simple.html
* After completing setup wizard: Web UI is at 192.168.0.1
DHCP enabled, login with empty password
* Flash factory.bin
* Perform a factory reset to restore OpenWrt UCI defaults
Installation COVR Points B:
* OEM Web UI is at 192.168.0.50, no DHCP, empty password
* Flash factory.bin
* Perform a factory reset to restore OpenWrt UCI defaults
Recovery:
* Keep reset button pressed during power on
* Recovery Web UI is at 192.168.0.50, no DHCP
* Flash factory.bin
used to work best with Chromium-based browsers or curl:
curl -F firmware=@factory.bin \
http://192.168.0.50/upgrade.cgi
since this fails to work on modern Linux systems,
there is also a script dlink_recovery_upload.py
Signed-off-by: Sebastian Schaper <openwrt@sebastianschaper.net>
Cleanup uart1-related node on ELECOM WAB-I1750-PS and enable it for
"SERIAL" port on the case.
"SERIAL" port can be used for OpenWrt console by adding the following
line to /etc/inittab and rebooting:
ttyATH1::askfirst:/usr/libexec/login.sh
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Add aliases with "serialN = &uartN;" of uart0/1 on QCA955x SoCs to
qca955x.dtsi, to enable uart1 on Linux Kernel.
without this:
[ 0.342915] ar933x-uart 18500000.uart: unable to get alias id, err=-19
Additionally, remove "serial0 = &uart;" alias from QCA955x device
dts/dtsi files.
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Add HighSpeed UART support to QCA955x series SoCs as a secondary UART
(uart1). This UART is compatible with qca,ar9330-uart.
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Rename the DT label of the primary UART on Qualcomm Atheros QCA955x
series SoCs to "uart0" from "uart" for the preparation to add HighSpeed
UART (uart1) support.
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
ELECOM WAB-I1750-PS is a 2.4/5 GHz band 11ac (Wi-Fi 5) access point,
based on QCA9558.
Specification:
- SoC : Qualcomm Atheros QCA9558
- RAM : DDR2 128 MiB (2x Winbond W9751G6KB251)
- Flash : SPI-NOR 16 MiB (Macronix MX25L12835FMI-10G)
- WLAN : 2.4/5 GHz 3T3R
- 2.4 GHz : Qualcomm Atheros QCA9558 (SoC)
- 5 GHz : Qualcomm Atheros QCA9880
- Ethernet : 2x 10/100/1000 Mbps
- phy ("PD") : Atheros AR8035
- phy ("PSE") : Atheros AR8033
- LEDs/keys (GPIO) : 3x/3x
- UART : 2x RJ-45 port
- "SERVICE" : TTL (3.3V)
- port : ttyS0
- assignment : 1:3.3V, 2:GND, 3:TX, 4:RX
- settings : 115200n8
- note : no compatibility with "Cisco console cable"
- "SERIAL" : RS232C (+-12V)
- port : ?
- assignment : 1:NC , 2:NC , 3:TXD, 4:GND,
5:GND, 6:RXD, 7:NC , 8:NC
- settings : 115200n8
- note : compatible with "Cisco console cable"
- Buzzer : 1x GPIO-controlled
- USB : 1x USB 2.0 Type-A
- Power : DC jack or PoE
- DC jack : 12 VDC, 1.04 A (device only, rating)
- PoE : 802.3af/at, 48 VDC, 0.26 A (device only, rating)
- note : supports 802.3af supply on PSE (downstream) port
when powered by DC adapter or 802.3at PoE
Flash instruction using factory.bin image:
1. Boot WAB-I1750-PS without no upstream connection (or PoE connection
without DHCP)
2. Access to the WebUI ("http://192.168.3.1") on the device and open
firmware update page
("ツールボックス" -> "ファームウェア更新")
3. Select the OpenWrt factory.bin image and click update
("アップデート") button
4. Wait ~120 seconds to complete flashing
Revert to OEM firmware:
1. Download the latest OEM firmware
2. Remove 128 bytes(0x80) header from firmware image
3. Decode by xor with a pattern "8844a2d168b45a2d" (hex val)
4. Upload the decoded firmware to the device
5. Flash to "firmware" partition by mtd command
6. Reboot
Notes:
- To use the "SERVICE" port, the connection of 3.3V line is also
required to enable console output.
The uart line of "SERVICE" is branched out from the internal pin
header with 74HC126D and 3.3V line is connected to OE pin on it.
- "SERIAL" port is provided by HS UART on QCA9558 SoC that has
compatibility with qca,ar9330-uart, but QCA955x SoC's is not supported
on Linux Kernel and OpenWrt.
- To supply 802.3af PoE on "PSE" port when powered by DC adapter, 12 VDC
3.5 A adapter is recommended. (official: WAB-EX-ADP1)
MAC addresses:
Ethernet (PD, PSE): 00:90:FE:xx:xx:0A (Config, ethaddr (text))
2.4GHz : 00:90:FE:xx:xx:0A (Config, ethaddr (text))
5GHz : 00:90:FE:xx:xx:0B
[original work]
Signed-off-by: Yanase Yuki <dev@zpc.st>
[update for NVMEM and others]
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
ELECOM WAB-S1167-PS is a 2.4/5 GHz band 11ac (Wi-Fi 5) access point,
based on QCA9557.
Specification:
- SoC : Qualcomm Atheros QCA9557
- RAM : DDR2 128 MiB (2x Winbond W9751G6KB251)
- Flash : SPI-NOR 16 MiB (Macronix MX25L12835FMI-10G)
- WLAN : 2.4/5 GHz 2T2R
- 2.4 GHz : Qualcomm Atheros QCA9557 (SoC)
- 5 GHz : Qualcomm Atheros QCA9882
- Ethernet : 2x 10/100/1000 Mbps
- phy ("PD") : Atheros AR8035
- phy ("PSE") : Atheros AR8033
- LEDs/keys (GPIO) : 3x/3x
- UART : 1x RJ-45 port
- "SERVICE" : TTL (3.3V)
- port : ttyS0
- assignment : 1:3.3V, 2:GND, 3:TX, 4:RX
- settings : 115200n8
- note : no compatibility with "Cisco console cable"
- Buzzer : 1x GPIO-controlled
- USB : 1x USB 2.0 Type-A
- Power : DC jack or PoE
- DC jack : 12 VDC, 1 A (device only, rating)
- PoE : 802.3af/at, 48 VDC, 0.25 A (device only, rating)
- note : supports 802.3af supply on PSE (downstream) port
when powered by DC adapter or 802.3at PoE
Flash instruction using factory.bin image:
1. Boot WAB-S1167-PS without no upstream connection (or PoE connection
without DHCP)
2. Access to the WebUI ("http://192.168.3.1") on the device and open
firmware update page
("ツールボックス" -> "ファームウェア更新")
3. Select the OpenWrt factory.bin image and click update
("アップデート") button
4. Wait ~120 seconds to complete flashing
Revert to OEM firmware:
1. Download the latest OEM firmware
2. Remove 128 bytes(0x80) header from firmware image
3. Decode by xor with a pattern "8844a2d168b45a2d" (hex val)
4. Upload the decoded firmware to the device
5. Flash to "firmware" partition by mtd command
6. Reboot
Notes:
- To use the "SERVICE" port, the connection of 3.3V line is also
required to enable console output.
The uart line of "SERVICE" is branched out from the internal pin
header with 74HC126D and 3.3V line is connected to OE pin on it.
- The same PCB is used with WAB-S600-PS.
- To supply 802.3af PoE on "PSE" port when powered by DC adapter, 12 VDC
3.5 A adapter is recommended. (official: WAB-EX-ADP1)
MAC addresses:
Ethernet (PD, PSE): 00:90:FE:xx:xx:04 (Config, ethaddr (text))
2.4GHz : 00:90:FE:xx:xx:04 (Config, ethaddr (text))
5GHz : 00:90:FE:xx:xx:05
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
ELECOM WAB-S600-PS is a 2.4/5 GHz band 11n (Wi-Fi 4) access point, based
on QCA9557.
This device also supports 11ac (Wi-Fi 5) with the another official
firmware.
Specification:
- SoC : Qualcomm Atheros QCA9557
- RAM : DDR2 128 MiB (2x Winbond W9751G6KB251)
- Flash : SPI-NOR 16 MiB (Macronix MX25L12835FMI-10G)
- WLAN : 2.4/5 GHz 2T2R
- 2.4 GHz : Qualcomm Atheros QCA9557 (SoC)
- 5 GHz : Qualcomm Atheros QCA9882
- Ethernet : 2x 10/100/1000 Mbps
- phy ("PD") : Atheros AR8035
- phy ("PSE") : Atheros AR8033
- LEDs/keys (GPIO) : 3x/3x
- UART : 1x RJ-45 port
- "SERVICE" : TTL (3.3V)
- port : ttyS0
- assignment : 1:3.3V, 2:GND, 3:TX, 4:RX
- settings : 115200n8
- note : no compatibility with "Cisco console cable"
- Buzzer : 1x GPIO-controlled
- USB : 1x USB 2.0 Type-A
- Power : DC jack or PoE
- DC jack : 12 VDC, 1 A (device only, rating)
- PoE : 802.3af/at, 48 VDC, 0.25 A (device only, rating)
- note : supports 802.3af supply on PSE (downstream) port
when powered by DC adapter or 802.3at PoE
Flash instruction using factory.bin image:
1. Boot WAB-S600-PS without no upstream connection (or PoE connection
without DHCP)
2. Access to the WebUI ("http://192.168.3.1") on the device and open
firmware update page
("ツールボックス" -> "ファームウェア更新")
3. Select the OpenWrt factory.bin image and click update
("アップデート") button
4. Wait ~120 seconds to complete flashing
Revert to OEM firmware:
1. Download the latest OEM firmware
2. Remove 128 bytes(0x80) header from firmware image
3. Decode by xor with a pattern "8844a2d168b45a2d" (hex val)
4. Upload the decoded firmware to the device
5. Flash to "firmware" partition by mtd command
6. Reboot
Notes:
- To use the "SERVICE" port, the connection of 3.3V line is also
required to enable console output.
The uart line of "SERVICE" is branched out from the internal pin
header with 74HC126D and 3.3V line is connected to OE pin on it.
- The same PCB is used with WAB-S1167-PS.
- To supply 802.3af PoE on "PSE" port when powered by DC adapter, 12 VDC
3.5 A adapter is recommended. (official: WAB-EX-ADP1)
MAC addresses:
Ethernet (PD, PSE): BC:5C:4C:xx:xx:7C (Config, ethaddr (text))
2.4GHz : BC:5C:4C:xx:xx:7C (Config, ethaddr (text))
5GHz : BC:5C:4C:xx:xx:7D
[original work of common dtsi part for WAB-I1750-PS]
Signed-off-by: Yanase Yuki <dev@zpc.st>
[adding support for WAB-S600-PS]
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Ubiquiti WA devices with newer hw version (sold 2023)
require UBNT_VERSION to be at least 8.7.4, otherwise
the image is rejected.
For consistency, also increase version number for XC devices.
Signed-off-by: Martin Garbe <monomartin@opennet-initiative.de>
This commit fixes the alphabetical order in 02_network.
The 2 deco devices in ath79_setup_interfaces() were in the wrong place.
Signed-off-by: Foica David <superh552@gmail.com>
Initial conversion to new LED color/function format
and drop label format where possible. The same label
is composed at runtime.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Drop redundant label with new LED color/function format declared.
This was needed previously when the new format wasn't supported by
leds.sh functions script. Now that is supported this property
can be removed in favor of the new format.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Specifications:
lan: eth0
wan: eth1
Problem Description:
The lan wan port is reversed with the current machine.
Use eth0 as LAN port and eth1 as WAN port.
Signed-off-by: Weiping Yang <weiping.yang@gl-inet.com>
The driver for the cellular modems serial interface and qmi was missing
from the default device packages. The driver is required to interact
with the modem using AT commands.
Signed-off-by: Jan Fuchs <jf@simonwunderlich.de>
This patch converts ath10k calibration data to NVMEM format for
wave 1 devices with mtd ASCII MAC address. The "calibration"
NVMEM cell size is 0x844. All unportable MAC address settings
have been moved to '10_fix_wifi_mac' scripts.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
This patch converts ath10k calibration data to NVMEM format for
wave 1 devices with mtd binary MAC address. The "calibration"
NVMEM cell size is 0x844. The MAC addresses are assigned via dts.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
This patch converts ath10k calibration data to NVMEM format for
wave 1 devices with built-in MAC address. The "calibration"
NVMEM cell size is 0x844.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
This patch converts ath10k pre-calibration data to NVMEM format for
wave 2 devices with mtd ASCII MAC address. The "pre-calibration"
NVMEM cell size is 0x2f20. All unportable MAC address settings have
been moved to '10_fix_wifi_mac' scripts.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
This patch converts ath10k pre-calibration data to NVMEM format for
wave 2 devices with mtd binary MAC address. The "pre-calibration"
NVMEM cell size is 0x2f20. The MAC addresses are assigned via dts.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
This patch converts ath10k pre-calibration data to NVMEM format for
wave 2 devices with built-in MAC address. The "pre-calibration"
NVMEM cell size is 0x2f20.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
The ath10k driver will load both pre-calibration data and board-2.bin
if board-2.bin exists. So it's not necessary to remove it. And this
change won't increase jffs2 image size.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Ubiquiti Rocket M XW is a single-band, 2x2:2 external Wi-Fi AP, with optional
GPS receiver, with two external RP-SMA antenna connections, based on
AR9342 SoC. Two band variants exists, for 2.4GHz and 5GHz band, usable
with the same image.
Specs:
- CPU: Atheros AR9342 MIPS SoC at 535MHz
- RAM: 64MB DDR400
- ROM: 8MB SPI-NOR in SO16W package, MX25L6408E
- Wi-Fi Atheros AR9342 built-in 2x2:2 radio
- Ethernet: Atheros AR8035 PHY, limited to 100Mbps speeds due to
magnetics
- Power: 24V passive PoE input.
Installation: please refer to Ubiquiti Bullet M2HP for documentation.
The device runs with exactly same image as the Bullet, and after fixes
in preceding commit, is fully functional again. Add the alternative name
to the build system.
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
Since commit 6f2e1b7485 ("ath79: disable delays on AT803X config init")
Ubiquiti XW boards equipped with AR8035 PHY suffered from lack of
outbound traffic on the Ethernet port. This was caused by the fact, the
U-boot has set this during boot and it wasn't reset by the PHY driver,
and the corresponding setting in device tree was wrong.
Set the 'phy-mode = "rgmii-txid"' at the ð0, and drop this property
from PHY node, as it is not parsed there. This causes the device to
connect using Ethernet once again.
Fixes: db4b6535f8 ("ath79: Add support for Ubiquity Bullet M (XW)")
Fixes: 6f2e1b7485 ("ath79: disable delays on AT803X config init")
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
Onboard AR8035 PHY supports 1000Base-T operation, but onboard
Ethernet magnetics do not. Reduce advertised link speeds to 100Mbps and
lower.
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
Commit e816591e22 ("ath79: qca: convert to nvmem-layout") mistakenly
switched the source of the mac address from the 'info' to 'art'
partition.
This patch updates all devices that share same 'parent' device tree file
and was tested to fix the problem for eap225-outdoor-v3 - device that I
actually own.
Fixes: e816591e22 ("ath79: qca: convert to nvmem-layout")
Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com>
[amend commit message]
Signed-off-by: Sander Vanheule <sander@svanheule.net>
Add support for Ubiquiti LiteBeam M5 (XW).
The device was previously supported in ar71xx.
See commit: https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=d0988235dd277b9a832bbc4b2a100ac6e821f577
Add ALTX_MODEL for Ubiquiti AirGrid M5 HP (XW), Ubiquiti PowerBeam M5 300 (XW) in generic-ubnt.mk
This models are identical (firmware-wise) to the already supported Ubiquiti Nanostation Loco M (XW)
Add also Ubiquiti NanoBeam M5 to ALTX_MODEL of Ubiquiti Nanostation Loco M (XW) since it's another clone.
Tested on:
- Ubiquiti LiteBeam M5 (XW)
- Ubiquiti PowerBeam M5 (XW)
This also modify target/ath79/dts/ar9342_ubnt_xw.dtsi to use nvmem for calibration data
Checked that the caldata size in the eeprom partition are actually 0x440 on:
- Ubiquiti PowerBeam M5 (XW)
- Ubiquiti Nanostation M5 (XW)
- Ubiquiti LiteBeam M5 (XW)
- Ubiquiti AirGrid M5 HP (XW)
Signed-off-by: Samuele Longhi <agave@dracaena.it>
Read back the reset register in order to flush the cache. This fixes
spurious reboot hangs on TP-Link TL-WDR3600 and TL-WDR4300 with Zentel
DRAM chips.
This issue was fixed in the past, but switching to the reset-driver
specific implementation removed the cache barrier which was previously
implicitly added by reading back the register in question.
Link: https://github.com/freifunk-gluon/gluon/issues/2904
Link: https://github.com/openwrt/openwrt/issues/13043
Link: https://dev.archive.openwrt.org/ticket/17839
Link: f8a7bfe1cb2c ("MIPS: ath79: fix system restart")
Signed-off-by: David Bauer <mail@david-bauer.net>
