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

v00:

• 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 + MT7995 + MT7977A + MT7977B
• powersupply 12V/5A required when using wifi card,2A (like on other BPi Routers) is not enough

GMAC1 (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 GMAC2 and GMAC3, 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.

waiting for bpi-team to verify the mode-switch.

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

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

currently use modified versions of:

• bpi uboot: https://github.com/frank-w/u-boot/tree/2023-04-bpi-r4
• official ATF: https://github.com/frank-w/u-boot/tree/mtk-atf-r4_2

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

Currently we need to limit ram to 3G because of swiotlb buffer full issues in ethernet driver

mem=3G

in cmdline (bootopts in my uboot uEnv.txt)

https://github.com/frank-w/BPI-Router-Linux/tree/6.5-mt7988

# 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 

• 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