.. SPDX-License-Identifier: GPL-2.0+

HiFive Unleashed
================

FU540-C000 RISC-V SoC
---------------------
The FU540-C000 is the world’s first 4+1 64-bit RISC-V SoC from SiFive.

The HiFive Unleashed development platform is based on FU540-C000 and capable
of running Linux.

Mainline support
----------------
The support for following drivers are already enabled:

1. SiFive UART Driver.
2. SiFive PRCI Driver for clock.
3. Cadence MACB ethernet driver for networking support.
4. SiFive SPI Driver.
5. MMC SPI Driver for MMC/SD support.

TODO:

1. U-Boot expects the serial console device entry to be present under /chosen
   DT node. Without a serial console U-Boot will panic. Example:

.. code-block:: none

   chosen {
        stdout-path = "/soc/serial@10010000:115200";
   };

Building
--------

1. Add the RISC-V toolchain to your PATH.
2. Setup ARCH & cross compilation enviornment variable:

.. code-block:: none

   export ARCH=riscv
   export CROSS_COMPILE=<riscv64 toolchain prefix>

3. make sifive_fu540_defconfig
4. make

Flashing
--------

The current U-Boot port is supported in S-mode only and loaded from DRAM.

A prior stage M-mode firmware/bootloader (e.g OpenSBI) is required to
boot the u-boot.bin in S-mode and provide M-mode runtime services.

Currently, the u-boot.bin is used as a payload of the OpenSBI FW_PAYLOAD
firmware. We need to compile OpenSBI with below command:

.. code-block:: none

make PLATFORM=sifive/fu540 FW_PAYLOAD_PATH=<path to u-boot-dtb.bin>

More detailed description of steps required to build FW_PAYLOAD firmware
is beyond the scope of this document. Please refer OpenSBI documenation.
(Note: OpenSBI git repo is at https://github.com/riscv/opensbi.git)

Once the prior stage firmware/bootloader binary is generated, it should be
copied to the first partition of the sdcard.

.. code-block:: none

    sudo dd if=<prior_stage_firmware_binary> of=/dev/disk2s1 bs=1024

Booting
-------
Once you plugin the sdcard and power up, you should see the U-Boot prompt.

Sample boot log from HiFive Unleashed board
-------------------------------------------

.. code-block:: none

   U-Boot 2019.07-00024-g350ff02f5b (Jul 22 2019 - 11:45:02 +0530)

   CPU:   rv64imafdc
   Model: SiFive HiFive Unleashed A00
   DRAM:  8 GiB
   MMC:   spi@10050000:mmc@0: 0
   In:    serial@10010000
   Out:   serial@10010000
   Err:   serial@10010000
   Net:   eth0: ethernet@10090000
   Hit any key to stop autoboot:  0
   => version
   U-Boot 2019.07-00024-g350ff02f5b (Jul 22 2019 - 11:45:02 +0530)

   riscv64-linux-gcc.br_real (Buildroot 2018.11-rc2-00003-ga0787e9) 8.2.0
   GNU ld (GNU Binutils) 2.31.1
   => mmc info
   Device: spi@10050000:mmc@0
   Manufacturer ID: 3
   OEM: 5344
   Name: SU08G
   Bus Speed: 20000000
   Mode: SD Legacy
   Rd Block Len: 512
   SD version 2.0
   High Capacity: Yes
   Capacity: 7.4 GiB
   Bus Width: 1-bit
   Erase Group Size: 512 Bytes
   => mmc part

   Partition Map for MMC device 0  --   Partition Type: EFI

   Part    Start LBA       End LBA         Name
           Attributes
           Type GUID
           Partition GUID
     1     0x00000800      0x000107ff      "bootloader"
           attrs:  0x0000000000000000
           type:   2e54b353-1271-4842-806f-e436d6af6985
           guid:   393bbd36-7111-491c-9869-ce24008f6403
     2     0x00040800      0x00ecdfde      ""
           attrs:  0x0000000000000000
           type:   0fc63daf-8483-4772-8e79-3d69d8477de4
           guid:   7fc9a949-5480-48c7-b623-04923080757f

Now you can configure your networking, tftp server and use tftp boot method to
load uImage.

.. code-block:: none

   => setenv ipaddr 10.206.7.133
   => setenv netmask 255.255.252.0
   => setenv serverip 10.206.4.143
   => setenv gateway 10.206.4.1
   => tftpboot ${kernel_addr_r} /sifive/fu540/Image
   ethernet@10090000: PHY present at 0
   ethernet@10090000: Starting autonegotiation...
   ethernet@10090000: Autonegotiation complete
   ethernet@10090000: link up, 1000Mbps full-duplex (lpa: 0x3c00)
   Using ethernet@10090000 device
   TFTP from server 10.206.4.143; our IP address is 10.206.7.133
   Filename '/sifive/fu540/Image'.
   Load address: 0x84000000
   Loading: #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            ##########################################
            1.2 MiB/s
   done
   Bytes transferred = 8867100 (874d1c hex)
   => tftpboot ${ramdisk_addr_r} /sifive/fu540/uRamdisk
   ethernet@10090000: PHY present at 0
   ethernet@10090000: Starting autonegotiation...
   ethernet@10090000: Autonegotiation complete
   ethernet@10090000: link up, 1000Mbps full-duplex (lpa: 0x3c00)
   Using ethernet@10090000 device
   TFTP from server 10.206.4.143; our IP address is 10.206.7.133
   Filename '/sifive/fu540/uRamdisk'.
   Load address: 0x88300000
   Loading: #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            #################################################################
            ##############
            418.9 KiB/s
   done
   Bytes transferred = 2398272 (249840 hex)
   => tftpboot ${fdt_addr_r} /sifive/fu540/hifive-unleashed-a00.dtb
   ethernet@10090000: PHY present at 0
   ethernet@10090000: Starting autonegotiation...
   ethernet@10090000: Autonegotiation complete
   ethernet@10090000: link up, 1000Mbps full-duplex (lpa: 0x7c00)
   Using ethernet@10090000 device
   TFTP from server 10.206.4.143; our IP address is 10.206.7.133
   Filename '/sifive/fu540/hifive-unleashed-a00.dtb'.
   Load address: 0x88000000
   Loading: ##
            1000 Bytes/s
   done
   Bytes transferred = 5614 (15ee hex)
   => setenv bootargs "root=/dev/ram rw console=ttySIF0 ip=dhcp earlycon=sbi"
   => booti ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
   ## Loading init Ramdisk from Legacy Image at 88300000 ...
      Image Name:   Linux RootFS
      Image Type:   RISC-V Linux RAMDisk Image (uncompressed)
      Data Size:    2398208 Bytes = 2.3 MiB
      Load Address: 00000000
      Entry Point:  00000000
      Verifying Checksum ... OK
   ## Flattened Device Tree blob at 88000000
      Booting using the fdt blob at 0x88000000
      Using Device Tree in place at 0000000088000000, end 00000000880045ed

   Starting kernel ...

   [    0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000
   [    0.000000] Linux version 5.3.0-rc1-00003-g460ac558152f (anup@anup-lab-machine) (gcc version 8.2.0 (Buildroot 2018.11-rc2-00003-ga0787e9)) #6 SMP Mon Jul 22 10:01:01 IST 2019
   [    0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
   [    0.000000] printk: bootconsole [sbi0] enabled
   [    0.000000] Initial ramdisk at: 0x(____ptrval____) (2398208 bytes)
   [    0.000000] Zone ranges:
   [    0.000000]   DMA32    [mem 0x0000000080200000-0x00000000ffffffff]
   [    0.000000]   Normal   [mem 0x0000000100000000-0x000000027fffffff]
   [    0.000000] Movable zone start for each node
   [    0.000000] Early memory node ranges
   [    0.000000]   node   0: [mem 0x0000000080200000-0x000000027fffffff]
   [    0.000000] Initmem setup node 0 [mem 0x0000000080200000-0x000000027fffffff]
   [    0.000000] software IO TLB: mapped [mem 0xfbfff000-0xfffff000] (64MB)
   [    0.000000] CPU with hartid=0 is not available
   [    0.000000] CPU with hartid=0 is not available
   [    0.000000] elf_hwcap is 0x112d
   [    0.000000] percpu: Embedded 18 pages/cpu s34584 r8192 d30952 u73728
   [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 2067975
   [    0.000000] Kernel command line: root=/dev/ram rw console=ttySIF0 ip=dhcp earlycon=sbi
   [    0.000000] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes, linear)
   [    0.000000] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes, linear)
   [    0.000000] Sorting __ex_table...
   [    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
   [    0.000000] Memory: 8182308K/8386560K available (5916K kernel code, 368K rwdata, 1840K rodata, 213K init, 304K bss, 204252K reserved, 0K cma-reserved)
   [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
   [    0.000000] rcu: Hierarchical RCU implementation.
   [    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
   [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
   [    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=4
   [    0.000000] NR_IRQS: 0, nr_irqs: 0, preallocated irqs: 0
   [    0.000000] plic: mapped 53 interrupts with 4 handlers for 9 contexts.
   [    0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0] hartid [1]
   [    0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff max_cycles: 0x1d854df40, max_idle_ns: 3526361616960 ns
   [    0.000006] sched_clock: 64 bits at 1000kHz, resolution 1000ns, wraps every 2199023255500ns
   [    0.008559] Console: colour dummy device 80x25
   [    0.012989] Calibrating delay loop (skipped), value calculated using timer frequency.. 2.00 BogoMIPS (lpj=4000)
   [    0.023104] pid_max: default: 32768 minimum: 301
   [    0.028273] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
   [    0.035765] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
   [    0.045307] rcu: Hierarchical SRCU implementation.
   [    0.049875] smp: Bringing up secondary CPUs ...
   [    0.055729] smp: Brought up 1 node, 4 CPUs
   [    0.060599] devtmpfs: initialized
   [    0.064819] random: get_random_u32 called from bucket_table_alloc.isra.10+0x4e/0x160 with crng_init=0
   [    0.073720] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
   [    0.083176] futex hash table entries: 1024 (order: 4, 65536 bytes, linear)
   [    0.090721] NET: Registered protocol family 16
   [    0.106319] vgaarb: loaded
   [    0.108670] SCSI subsystem initialized
   [    0.112515] usbcore: registered new interface driver usbfs
   [    0.117758] usbcore: registered new interface driver hub
   [    0.123167] usbcore: registered new device driver usb
   [    0.128905] clocksource: Switched to clocksource riscv_clocksource
   [    0.141239] NET: Registered protocol family 2
   [    0.145506] tcp_listen_portaddr_hash hash table entries: 4096 (order: 4, 65536 bytes, linear)
   [    0.153754] TCP established hash table entries: 65536 (order: 7, 524288 bytes, linear)
   [    0.163466] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes, linear)
   [    0.173468] TCP: Hash tables configured (established 65536 bind 65536)
   [    0.179739] UDP hash table entries: 4096 (order: 5, 131072 bytes, linear)
   [    0.186627] UDP-Lite hash table entries: 4096 (order: 5, 131072 bytes, linear)
   [    0.194117] NET: Registered protocol family 1
   [    0.198417] RPC: Registered named UNIX socket transport module.
   [    0.203887] RPC: Registered udp transport module.
   [    0.208664] RPC: Registered tcp transport module.
   [    0.213429] RPC: Registered tcp NFSv4.1 backchannel transport module.
   [    0.219944] PCI: CLS 0 bytes, default 64
   [    0.224170] Unpacking initramfs...
   [    0.262347] Freeing initrd memory: 2336K
   [    0.266531] workingset: timestamp_bits=62 max_order=21 bucket_order=0
   [    0.280406] NFS: Registering the id_resolver key type
   [    0.284798] Key type id_resolver registered
   [    0.289048] Key type id_legacy registered
   [    0.293114] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
   [    0.300262] NET: Registered protocol family 38
   [    0.304432] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
   [    0.311862] io scheduler mq-deadline registered
   [    0.316461] io scheduler kyber registered
   [    0.356421] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
   [    0.363004] 10010000.serial: ttySIF0 at MMIO 0x10010000 (irq = 4, base_baud = 0) is a SiFive UART v0
   [    0.371468] printk: console [ttySIF0] enabled
   [    0.371468] printk: console [ttySIF0] enabled
   [    0.380223] printk: bootconsole [sbi0] disabled
   [    0.380223] printk: bootconsole [sbi0] disabled
   [    0.389589] 10011000.serial: ttySIF1 at MMIO 0x10011000 (irq = 1, base_baud = 0) is a SiFive UART v0
   [    0.398680] [drm] radeon kernel modesetting enabled.
   [    0.412395] loop: module loaded
   [    0.415214] sifive_spi 10040000.spi: mapped; irq=3, cs=1
   [    0.420628] sifive_spi 10050000.spi: mapped; irq=5, cs=1
   [    0.425897] libphy: Fixed MDIO Bus: probed
   [    0.429964] macb 10090000.ethernet: Registered clk switch 'sifive-gemgxl-mgmt'
   [    0.436743] macb: GEM doesn't support hardware ptp.
   [    0.441621] libphy: MACB_mii_bus: probed
   [    0.601316] Microsemi VSC8541 SyncE 10090000.ethernet-ffffffff:00: attached PHY driver [Microsemi VSC8541 SyncE] (mii_bus:phy_addr=10090000.ethernet-ffffffff:00, irq=POLL)
   [    0.615857] macb 10090000.ethernet eth0: Cadence GEM rev 0x10070109 at 0x10090000 irq 6 (70:b3:d5:92:f2:f3)
   [    0.625634] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
   [    0.631381] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
   [    0.637382] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
   [    0.643799] ehci-pci: EHCI PCI platform driver
   [    0.648261] ehci-platform: EHCI generic platform driver
   [    0.653497] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
   [    0.659599] ohci-pci: OHCI PCI platform driver
   [    0.664055] ohci-platform: OHCI generic platform driver
   [    0.669448] usbcore: registered new interface driver uas
   [    0.674575] usbcore: registered new interface driver usb-storage
   [    0.680642] mousedev: PS/2 mouse device common for all mice
   [    0.709493] mmc_spi spi1.0: SD/MMC host mmc0, no DMA, no WP, no poweroff, cd polling
   [    0.716615] usbcore: registered new interface driver usbhid
   [    0.722023] usbhid: USB HID core driver
   [    0.726738] NET: Registered protocol family 10
   [    0.731359] Segment Routing with IPv6
   [    0.734332] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
   [    0.740687] NET: Registered protocol family 17
   [    0.744660] Key type dns_resolver registered
   [    0.806775] mmc0: host does not support reading read-only switch, assuming write-enable
   [    0.814020] mmc0: new SDHC card on SPI
   [    0.820137] mmcblk0: mmc0:0000 SU08G 7.40 GiB
   [    0.850220]  mmcblk0: p1 p2
   [    3.821524] macb 10090000.ethernet eth0: link up (1000/Full)
   [    3.828938] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
   [    3.848919] Sending DHCP requests .., OK
   [    6.252076] IP-Config: Got DHCP answer from 10.206.4.1, my address is 10.206.7.133
   [    6.259624] IP-Config: Complete:
   [    6.262831]      device=eth0, hwaddr=70:b3:d5:92:f2:f3, ipaddr=10.206.7.133, mask=255.255.252.0, gw=10.206.4.1
   [    6.272809]      host=dhcp-10-206-7-133, domain=sdcorp.global.sandisk.com, nis-domain=(none)
   [    6.281228]      bootserver=10.206.126.11, rootserver=10.206.126.11, rootpath=
   [    6.281232]      nameserver0=10.86.1.1, nameserver1=10.86.2.1
   [    6.294179]      ntpserver0=10.86.1.1, ntpserver1=10.86.2.1
   [    6.301026] Freeing unused kernel memory: 212K
   [    6.304683] This architecture does not have kernel memory protection.
   [    6.311121] Run /init as init process
              _  _
             | ||_|
             | | _ ____  _   _  _  _
             | || |  _ \| | | |\ \/ /
             | || | | | | |_| |/    \
             |_||_|_| |_|\____|\_/\_/

                  Busybox Rootfs

   Please press Enter to activate this console.
   / #