configs/nvidia_bf3_defconfig: new defconfig

This patch adds a basic support for the Bluefied3 board from
Mellanox/NVIDIA:
  - https://www.nvidia.com/en-us/networking/products/data-processing-unit/

  Brief summary of the board features:
  - multicore ARM
      - 16 Core ARM Processor
  - DDR4: 16GB/32GB
  - 2x embedded CX7

Signed-off-by: Vincent Jardin <vjardin@free.fr>
Reviewed-by: Julien Olivain <ju.o@free.fr>
[Julien:
- remove add-custom-hashes from the commit log
- add link for upstream kernel hashes
- check hash with pgp
- reflow the readme.txt
- regenerated defconfig with make savedefconfig]
Signed-off-by: Julien Olivain <ju.o@free.fr>

DEVELOPERS

@@ -3271,6 +3271,8 @@ N:	Victor Huesca <victor.huesca@bootlin.com>
 F:	support/testing/tests/core/test_root_password.py
 
 N:	Vincent Jardin <vjardin@free.fr>
+F:	board/nvidia/bf3/
+F:	configs/nvidia_bf3_defconfig
 F:	package/dpdk/
 
 N:	Vincent Prince <vincent.prince.fr@gmail.com>

board/nvidia/bf3/linux.config

@@ -0,0 +1,163 @@
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_TASKSTATS=y
+CONFIG_MEMCG=y
+CONFIG_BLK_CGROUP=y
+CONFIG_CPUSETS=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_SCHED_AUTOGROUP=y
+CONFIG_PROFILING=y
+CONFIG_ARCH_VEXPRESS=y
+CONFIG_COMPAT=y
+CONFIG_ACPI=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_BLK_DEV_BSGLIB=y
+CONFIG_BINFMT_MISC=y
+CONFIG_TRANSPARENT_HUGEPAGE=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_PACKET_DIAG=y
+CONFIG_UNIX=y
+CONFIG_NET_KEY=y
+CONFIG_INET=y
+CONFIG_IP_MULTICAST=y
+CONFIG_IP_ADVANCED_ROUTER=y
+CONFIG_BRIDGE=y
+CONFIG_NET_SCHED=y
+CONFIG_VSOCKETS=y
+CONFIG_PCI=y
+CONFIG_PCI_HOST_GENERIC=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_FW_CFG_SYSFS=y
+CONFIG_FW_CFG_SYSFS_CMDLINE=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_CHR_DEV_SG=y
+CONFIG_SCSI_CONSTANTS=y
+CONFIG_SCSI_LOGGING=y
+CONFIG_SCSI_SCAN_ASYNC=y
+CONFIG_SCSI_VIRTIO=y
+CONFIG_ATA=y
+CONFIG_NETDEVICES=y
+CONFIG_DUMMY=y
+CONFIG_MACVLAN=y
+CONFIG_VIRTIO_NET=y
+CONFIG_NLMON=y
+CONFIG_INPUT_EVDEV=y
+CONFIG_SERIAL_AMBA_PL011=y
+CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_HW_RANDOM=y
+CONFIG_HW_RANDOM_VIRTIO=y
+CONFIG_TCG_TPM=y
+CONFIG_TCG_TIS=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_PL031=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_INPUT=y
+CONFIG_VIRTIO_MMIO=y
+CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
+CONFIG_MAILBOX=y
+CONFIG_PL320_MBOX=y
+CONFIG_ARM_SMMU_V3=y
+CONFIG_EXT4_FS=y
+CONFIG_FUSE_FS=y
+CONFIG_VIRTIO_FS=y
+CONFIG_OVERLAY_FS=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_RAS=y
+CONFIG_EDAC=y
+CONFIG_EDAC_LEGACY_SYSFS=y
+CONFIG_EDAC_BLUEFIELD=y
+CONFIG_I2C=y
+CONFIG_MELLANOX_PLATFORM=y
+CONFIG_REGMAP_I2C=y
+CONFIG_I2C_CHARDEV=y
+CONFIG_GPIO_MLXBF2=y
+CONFIG_GPIO_MLXBF3=y
+CONFIG_GPIO_MLXBF=y
+CONFIG_I2C_MLXBF=y
+CONFIG_I2C_MLXCPLD=y
+CONFIG_I2C_MUX=y
+CONFIG_I2C_MUX_MLXCPLD=y
+CONFIG_NEW_LEDS=y
+CONFIG_LEDS_CLASS=y
+CONFIG_LEDS_MLXCPLD=y
+CONFIG_LEDS_MLXREG=y
+CONFIG_NET_SWITCHDEV=y
+CONFIG_MLX5_BRIDGE=y
+CONFIG_NET_CLS_ACT=y
+CONFIG_NET_TC_SKB_EXT=y
+CONFIG_CONFIG_NET_CLS_ACT=y
+CONFIG_MLX5_CLS_ACT=y
+CONFIG_DCB=y
+CONFIG_MLX5_CORE_EN_DCB=y
+CONFIG_MLX5_CORE_EN=y
+CONFIG_MLX5_CORE=y
+CONFIG_MLX5_DPLL=y
+CONFIG_MLX5_EN_ARFS=y
+CONFIG_INET_ESP=y
+CONFIG_INET6_ESP=y
+CONFIG_XFRM_OFFLOAD=y
+CONFIG_INET_ESP_OFFLOAD=y
+CONFIG_INET6_ESP_OFFLOAD=y
+CONFIG_MLX5_EN_IPSEC=y
+CONFIG_MLX5_EN_RXNFC=y
+CONFIG_TLS_DEVICE=y
+CONFIG_TLS=y
+CONFIG_MLX5_EN_TLS=y
+CONFIG_MLX5_ESWITCH=y
+CONFIG_MLX5_FPGA_IPSEC=y
+CONFIG_MLX5_FPGA_TLS=y
+CONFIG_MLX5_FPGA=y
+CONFIG_MLX5_IPSEC=y
+CONFIG_MACSEC=y
+CONFIG_MLX5_MACSEC=y
+CONFIG_MLX5_MPFS=y
+CONFIG_MLX5_SF_MANAGER=y
+CONFIG_MLX5_SF=y
+CONFIG_MLX5_SW_STEERING=y
+CONFIG_NETFILTER=y
+CONFIG_NETFILTER_INGRESS=y
+CONFIG_NF_CONNTRACK=y
+CONFIG_NF_TABLES=y
+CONFIG_NF_FLOW_TABLE=y
+CONFIG_NET_ACT_CT=y
+CONFIG_MLX5_TC_CT=y
+CONFIG_MLX5_TC_SAMPLE=y
+CONFIG_MLX5_TLS=y
+CONFIG_VDPA=y
+CONFIG_VHOST_IOTLB=y
+CONFIG_MLX5_VDPA_NET=y
+CONFIG_MLX5_VDPA_STEERING_DEBUG=y
+CONFIG_MLX5_VDPA=y
+CONFIG_IOMMUFD=y
+CONFIG_IOMMU_SUPPORT=y
+CONFIG_VFIO=y
+CONFIG_MLX5_VFIO_PCI=y
+CONFIG_MLXBF_BOOTCTL=y
+CONFIG_MLXBF_GIGE=y
+CONFIG_MLXBF_PMC=y
+CONFIG_MLXBF_TMFIFO=y
+CONFIG_MLXFW=y
+CONFIG_MLXREG_HOTPLUG=y
+CONFIG_MLXREG_IO=y
+CONFIG_WATCHDOG=y
+CONFIG_MLX_WDT=y
+CONFIG_MMC=y
+CONFIG_MMC_DW=y
+CONFIG_MMC_DW_BLUEFIELD=y
+CONFIG_NET_VENDOR_MELLANOX=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_MLXBF3=y
+CONFIG_POWER_MLXBF=y
+CONFIG_SENSORS_MLXREG_FAN=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_RD_GZIP=y
+CONFIG_INITRAMFS_COMPRESSION_GZIP=y

board/nvidia/bf3/patches/linux-headers/linux-headers.hash

@@ -0,0 +1 @@
+../linux/linux.hash

board/nvidia/bf3/patches/linux/linux.hash

@@ -0,0 +1,4 @@
+# From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
+# After checking with pgp with using key
+# B8868C80BA62A1FFFAF5FDA9632D3A06589DA6B1
+sha256  c954f60197008f1e1f32a1e77293903cf3801d2543ec4bf521f5651eb7f133ce  linux-6.11.6.tar.xz

board/nvidia/bf3/readme.txt

@@ -0,0 +1,70 @@
+*****************
+BlueField 3 Board
+*****************
+
+The BlueField 3 board is provided "as-is" without official support
+from NVIDIA.
+
+For a detailed description of this board, please refer to the official
+website:
+https://www.nvidia.com/en-us/networking/products/data-processing-unit/
+
+
+Missing Kernel Modules
+======================
+
+Please note that the following kernel modules are unavailable as they
+are not included in the Linux upstream repository:
+  - CONFIG_MLXBF_PTM (module: mlxbf-ptm)
+  - CONFIG_MLXBF_PKA (module: mlxbf-pka)
+
+For further details on these kernel modules and their usage, please
+refer to the NVIDIA documentation:
+https://docs.nvidia.com/networking/display/bluefielddpuosv470/installing+popular+linux+distributions+on+bluefield
+
+
+Boot loader
+===========
+
+NVIDIA does not provide information for rebuilding the ARM BL1, BL2,
+BL3, UEFI, or other components in the boot stages. Therefore, we
+assume the BF3 board is already running the pre-built Ubuntu image
+provided in the BFB installation format.
+
+Since there are no available details on the BF3's BFB format or the
+ARM Trusted Firmware (ATF) needed to rebuild BL1, BL2, BL3, UEFI, or
+GRUB, these components are assumed to remain unmodified.
+
+
+Grub Configuration and Image Loading
+====================================
+
+The board's image is loaded from the BF3's GRUB, with the following
+GRUB settings, assuming the console is set to `hvc0` to provide access
+thru `/dev/rshimN/console` from the root CPU since the root CPU's
+rshim exposes a virtio console over the PCIe bus to the BR3 board.
+
+To update GRUB settings, boot using the built-in BF3 Ubuntu image.
+
+Extract of /etc/default/grub:
+
+    GRUB_DEFAULT=0
+    GRUB_TIMEOUT_STYLE=menu
+    GRUB_TIMEOUT=-1
+    GRUB_RECORDFAIL_TIMEOUT=5
+    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
+    GRUB_CMDLINE_LINUX_DEFAULT=""
+    GRUB_CMDLINE_LINUX="console=hvc0 earlyprintk=hvc0 earlycon=hvc0 loglevel=7 fixrtc net.ifnames=0 biosdevname=0 iommu.passthrough=1"
+
+
+Uploading Buildroot Images
+--------------------------
+
+After configuring GRUB, you can upload your Buildroot images to the
+BF3’s GRUB boot folder:
+
+    scp build_folder/images/Image BF3:/boot/vmlinuz-buildroot-xyz
+
+Finally, run `update-grub` on the BF3 board to apply the updated GRUB settings.
+
+Enjoy!

configs/nvidia_bf3_defconfig

@@ -0,0 +1,12 @@
+BR2_aarch64=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_11=y
+BR2_GLOBAL_PATCH_DIR="board/nvidia/bf3/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.11.6"
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/nvidia/bf3/linux.config"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_TARGET_ROOTFS_INITRAMFS=y
+# BR2_TARGET_ROOTFS_TAR is not set