https://wiki.banana-pi.org/Banana_Pi_BPI-R4

• MediaTek MT7988A (Filogic 880)
  • MT7530 switch builtin (1 cpu-port with 4GBit/s + 1Gbit/s user-ports)
• 4G RAM
• 8GB eMMC flash
• 128MB SPI-NAND Flash
• either 2x SFP+ (10GBit/s USXGMII) or 1SFP+ and 2g5 rj45 with PoE (link)
• Wifi7 with additional module connected to the 2 PCIe slots at bottom of board
  • MediaTek MT7996 + MT7975 (2.4G) + MT7977A (6G) + MT7977B (5G)
• powersupply 12V/5A required when using wifi card,2A (like on other BPi Routers) is not enough

v00:

v1.0:

Changes between v0 and v1 (pm): https://forum.banana-pi.org/t/bpi-r4-linux-bootup/15926/59

GMAC0 (4GBit/s) is connected internally to mt7530 switch variant where the 4 user-Ports are exposed as rj45 on board (1xWan,3xLan).

The SFP(+) cages are connected to SerDes lanes of GMAC1 and GMAC2, and those can be switched between SGMII/1000Base-X/2500Base-X mode for 10M/100M/1000M/2500M (via mtk-pcs-lynxi, just like on MT7622 and MT7986) and USXGMII/10GBase-KR for 5000M and 10000M. Hence it should be possible to support both, SFP modules with 1000M and 2500M, as well as SFP+ modules with 5000M and 10000M.

Sfp-connections

full 10G will need RSS+LRO implemented in mtk ethernet driver and enabled:

ethtool -K eth2 lro on # enable hw_lro

RSS: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/18f46a84d87308a4f56f9176ca166dc75c38bb20%5E%21/ LRO: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/ddc366751fad05dade79b09932a999c5d5ae890c%5E%21/#F0

NETSYS: V2 for mt7986 (bpi-r3) V3 for mt7988 (bpi-r4)

wifi is realized with daughter board (Network Interface Card) in the 2 mPCIe-Slots at bottom of the board.

Wifi-Module needs 12V…v1 uses sw4 in on-position, v0 used devicetree-overlay which enables the WIFI_PWR_EN regulator. Be careful with this setting when using different card in mPCIe slots!

kernel-module: mt7996e.ko

Newer wifi card planned with reduced antenna-count (6 instead of 14): https://forum.banana-pi.org/t/bpi-r4-any-information/15404/83

2x1Lane (M.2 slots) and 2x2lane. the 2x2lane is for wifi (mPCIe slots).

switch down is “1”, so both down booting from sdcard (v0 had both up to boot from sdcard)

v0:

currently use these:

• uboot: https://github.com/frank-w/u-boot/tree/2023-10-bpi
• ATF: https://github.com/frank-w/u-boot/tree/mtk-atf

and bootup "my" kernel like this:

MT7988> setenv fit 6.5.0-rc1-mt7988.itb
MT7988> setenv kaddr 0x48000000
MT7988> fatload mmc 0:5 ${kaddr} ${fit}
4970220 bytes read in 417 ms (11.4 MiB/s)
MT7988> bootm ${kaddr}

kaddr 0x46000000 works too, if uncompressed kernelimage is smaller than 32M (fit size of 14M was too large)

in newer u-boot i have set kaddr to 0x46000000 (fit loadaddr 0x44000000, rdaddr 0x48000000)

swiotlb errors (in ethernet-driver) can be fixed with limiting ram in uboot/cmdline to 3G (32bit border)

BPI-R4> setenv bootfile 6.5.0-rc1-mt7988-r4.itb
BPI-R4> run bootnetfit

https://www.kernel.org/doc/html/v6.1/admin-guide/kernel-parameters.html

3GB Ram limit not needed anymore as ethernet driver now uses 36bit addressing

mem=3G

https://github.com/frank-w/BPI-Router-Linux/tree/6.6-dango

# mount -t debugfs none /sys/kernel/debug/
# cat /sys/kernel/debug/gpio
# cat /sys/kernel/debug/pinctrl/pinctrl-handles
# cat /sys/kernel/debug/regulator/regulator_summary
# cat /sys/kernel/debug/clk/clk_summary

ip link set lan0 up
ip a a 192.168.0.19/24 dev lan0
ip r a default via 192.168.0.10
date -s "2023-08-23 19:37 CEST"
#stats
ip -s link show dev eth2
ethtool -S eth2

DNS needs to be set in /etc/resolv.conf or in systemd like this:

mkdir -p /etc/systemd/resolved.conf.d/ 
cp /etc/systemd/resolved.conf /etc/systemd/resolved.conf.d/TEST.conf
echo "DNS = 192.168.0.10" >> /etc/systemd/resolved.conf.d/TEST.conf
systemctl restart systemd-resolved.service 

modules in initrd:

mount /dev/mmcblk0p6 /mnt
mkdir /lib/modules
mkdir /lib/firmware
mount -o bind /mnt/lib/modules /lib/modules
mount -o bind /mnt/lib/firmware /lib/firmware
modprobe mt7996e

• clone openwrt master
• add this to feeds.conf.default: “src-git mtksdk https://git01.mediatek.com/openwrt/feeds/mtk-openwrt-feeds”
• scripts/feeds update -f mtksdk
• make menuconfig:
  • Target System (MediaTek Ralink ARM)
  • Subtarget (Filogic 8×0 (MT798x))
  • Target Profile (MediaTek MT7988a nand rfb) #here i see no sd-variant

adding additional options:

CONFIG_PACKAGE_f2fs-tools=y
CONFIG_PACKAGE_e2fsprogs=y
CONFIG_PACKAGE_dosfstools=y
CONFIG_PACKAGE_resize2fs=y
CONFIG_PACKAGE_nano=y
CONFIG_PACKAGE_iperf3=y
#CONFIG_PACKAGE_netcat
CONFIG_PACKAGE_tcpdump=y
CONFIG_BUSYBOX_CUSTOM=y
CONFIG_BUSYBOX_CONFIG_TELNET=y

*-initramfs-kernel.bin is not the production image we’re using. We only use it for testing purpose since it contains rootfs and won’t read the flash.
*-sysupgrade.bin is the actual production image. It’s a tar ball for nand/emmc/sd boards. It contains separate kernel and rootfs that will be written to ubi volume for nand, or the partitions defined for sd/emmc.

tar -xf bin/targets/mediatek/filogic/openwrt-mediatek-filogic-mediatek_mt7988a-rfb-nand-squashfs-sysupgrade.bin sysupgrade-mediatek_mt7988a-rfb-nand/kernel
dumpimage -l sysupgrade-mediatek_mt7988a-rfb-nand/kernel