This is what I see when the network cable is unplugged: (from my own build, which is very similar to the preloaded images) The only significant difference I can see is a different make of SD-card, which has 32G instead of 16G. You could try a different make of SD-card, or use the ethernet boot method which does not rely on the vagaries of SD. Unfortunately signal integrity on this card interface isn't the greatest, so we limit if to 5MHz. Perhaps some makes would require even slower clocking. The first boot after flashing the card will take quite a while to generate the ssh key, but this comes later than the point you mention. Selftest iteration 1 Selftest matches=4/4, delay = 4 Selftest iteration 2 Selftest matches=8/8, delay = 4 Selftest iteration 3 Selftest matches=16/16, delay = 4 Selftest iteration 4 Selftest matches=32/32, delay = 9 Selftest iteration 5 Selftest matches=64/64, delay = 17 Selftest iteration 6 Selftest matches=128/128, delay = 34 Selftest iteration 7 Selftest matches=256/256, delay = 68 Selftest iteration 8 Selftest matches=375/375, delay = 100 lowRISC boot program ===================================== Hello LowRISC! Thu Jan 11 17:15:45 2018 Booting from FLASH because SW1 is high .. sdhci_minion_hw_reset(); sdhci_minion_hw_reset(); Power = 3.3V Card clock disabled Trying clock div = 255 Actual clock divider = 255 Card clock disabled Trying clock div = 255 Actual clock divider = 255 Card clock enabled busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = ff0000 busy = c0ff0000 RCA = aaaa0000 4-bit bus enabled Trying clock div = 12 Actual clock divider = 12 Card clock disabled Trying clock div = 12 Actual clock divider = 12 Card clock disabled Trying clock div = 12 Actual clock divider = 12 Card clock enabled Switch selection = 1400 Load boot0000.bin into memory Load 5272024 bytes to memory address 86e00000 from boot.bin of 5272024 bytes. Disabling Ethernet md5(0x86e00000,5272576) = 08277d52ab1458e3cbeed8ffda27db35 Digest of 5272576 bytes = 08277d52ab1458e3cbeed8ffda27db35 Disabling interrupts, Ethernet interrupt = 1 Loaded 5272576 bytes to memory address 86e00000 from boot.bin load elf to DDR memory Section[0]: memcpy(0x80000000,0x0x86e01000,0x6c70); memset(0x80006c70,0,0x58); Section[1]: memcpy(0x80007000,0x0x86e08000,0x4fcb28); Boot the loaded program...               vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv                   vvvvvvvvvvvvvvvvvvvvvvvvvvvv rrrrrrrrrrrrr       vvvvvvvvvvvvvvvvvvvvvvvvvv rrrrrrrrrrrrrrrr      vvvvvvvvvvvvvvvvvvvvvvvv rrrrrrrrrrrrrrrrrr    vvvvvvvvvvvvvvvvvvvvvvvv rrrrrrrrrrrrrrrrrr    vvvvvvvvvvvvvvvvvvvvvvvv rrrrrrrrrrrrrrrrrr    vvvvvvvvvvvvvvvvvvvvvvvv rrrrrrrrrrrrrrrr      vvvvvvvvvvvvvvvvvvvvvv rrrrrrrrrrrrr       vvvvvvvvvvvvvvvvvvvvvv rr                vvvvvvvvvvvvvvvvvvvvvv rr            vvvvvvvvvvvvvvvvvvvvvvvv      rr rrrr      vvvvvvvvvvvvvvvvvvvvvvvvvv      rrrr rrrrrr      vvvvvvvvvvvvvvvvvvvvvv      rrrrrr rrrrrrrr      vvvvvvvvvvvvvvvvvv      rrrrrrrr rrrrrrrrrr      vvvvvvvvvvvvvv      rrrrrrrrrr rrrrrrrrrrrr      vvvvvvvvvv      rrrrrrrrrrrr rrrrrrrrrrrrrr      vvvvvv      rrrrrrrrrrrrrr rrrrrrrrrrrrrrrr      vv      rrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrr          rrrrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrrrr      rrrrrrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrrrrrr  rrrrrrrrrrrrrrrrrrrrrr        INSTRUCTION SETS WANT TO BE FREE [    0.000000] Linux version 4.6.2-gf49213b (jrrk2(a)brexit.cl.cam.ac.uk) (gcc version 6.1.0 (GCC) ) #1 Fri Jan 12 10:03:59 GMT 2018 [    0.000000] Available physical memory: 114MB [    0.000000] Initial ramdisk at: 0xffffffff80016958 (781616 bytes) [    0.000000] Zone ranges: [    0.000000]   Normal   [mem 0x0000000080600000-0x00000000877fffff] [    0.000000] Movable zone start for each node [    0.000000] Early memory node ranges [    0.000000]   node   0: [mem 0x0000000080600000-0x00000000877fffff] [    0.000000] Initmem setup node 0 [mem 0x0000000080600000-0x00000000877fffff] [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 28785 [    0.000000] Kernel command line: [    0.000000] PID hash table entries: 512 (order: 0, 4096 bytes) [    0.000000] Dentry cache hash table entries: 16384 (order: 5, 131072 bytes) [    0.000000] Inode-cache hash table entries: 8192 (order: 4, 65536 bytes) [    0.000000] Sorting __ex_table... [    0.000000] Memory: 110464K/116736K available (2598K kernel code, 147K rwdata, 548K rodata, 856K init, 239K bss, 6272K reserved, 0K cma-reserved) [    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [    0.000000] NR_IRQS:0 nr_irqs:0 0 [    0.000000] clocksource: riscv_clocksource: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100 ns [    0.000000] Calibrating delay loop (skipped), value calculated using timer frequency.. 0.50 BogoMIPS (lpj=2500) [    0.000000] pid_max: default: 32768 minimum: 301 [    0.000000] Mount-cache hash table entries: 512 (order: 0, 4096 bytes) [    0.000000] Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes) [    0.090000] devtmpfs: initialized [    0.120000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [    0.150000] NET: Registered protocol family 16 [    0.360000] clocksource: Switched to clocksource riscv_clocksource [    0.430000] NET: Registered protocol family 2 [    0.460000] TCP established hash table entries: 1024 (order: 1, 8192 bytes) [    0.470000] TCP bind hash table entries: 1024 (order: 1, 8192 bytes) [    0.470000] TCP: Hash tables configured (established 1024 bind 1024) [    0.480000] UDP hash table entries: 256 (order: 1, 8192 bytes) [    0.480000] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes) [    0.490000] NET: Registered protocol family 1 [    0.510000] RPC: Registered named UNIX socket transport module. [    0.510000] RPC: Registered udp transport module. [    0.510000] RPC: Registered tcp transport module. [    0.510000] RPC: Registered tcp NFSv4.1 backchannel transport module. [    3.150000] Unpacking initramfs... [    5.810000] hid_keyboard address 40020000, remapped to ffffffff78002000 [    5.810000] hid_display address 40028000, remapped to ffffffff78010000 [    6.170000] console [xuart_console0] enabled [    6.180000] keyb_timer is started [    6.220000] futex hash table entries: 256 (order: 0, 6144 bytes) [    6.240000] workingset: timestamp_bits=61 max_order=15 bucket_order=0 [    6.780000] io scheduler noop registered (default) [    9.900000] lowrisc-digilent-ethernet: Lowrisc ethernet platform (40018000-4001FFFF) mapped to ffffffff78020000 [    9.930000] libphy: GPIO Bitbanged LowRISC: probed [    9.940000] Probing lowrisc-0:01 [    9.950000] SMSC LAN8710/LAN8720 lowrisc-0:01: attached PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=lowrisc-0:01, irq=-1) [   10.000000] lowrisc_digilent_ethernet lowrisc_digilent_ethernet: Lowrisc Ether100MHz registered [   10.100000] Card inserted, mask changed to 4 [   10.130000] NET: Registered protocol family 17 [   10.140000] Key type dns_resolver registered [   10.310000] Freeing unused kernel memory: 856K (ffffffff80000000 - ffffffff800d6000) [   10.330000] This architecture does not have kernel memory protection. [   10.590000] Open device, request interrupt Setting the clock ... [   11.570000] mmc0: new SDHC card at address aaaa [   11.590000] blk_queue_max_hw_sectors: set to minimum 8 [   11.610000] mmcblk0: mmc0:aaaa SL16G 14.8 GiB [   11.670000]  mmcblk0: p1 p2 p3 rdate: timeout connecting to time server Waiting for the sd card ... Mounting the sd partition ... [   31.300000] EXT2-fs (mmcblk0p2): warning: mounting unchecked fs, running e2fsck is recommended Switch to sd root [   36.050000] random: nonblocking pool is initialized INIT: version 2.88 booting bootlogd: cannot find console device 4:0 under /dev hwclock: can't open '/dev/misc/rtc': No such file or directory Wed Feb 21 00:06:02 UTC 2018 hwclock: can't open '/dev/misc/rtc': No such file or directory INIT: Entering runlevel: 2 Configuring network interfaces... udhcpc (v1.24.1) started Sending discover... Sending discover... Sending discover... No lease, forking to background done. Starting Dropbear SSH server: dropbear. hwclock: can't open '/dev/misc/rtc': No such file or directory Starting syslogd/klogd: done Poky (Yocto Project Reference Distro) 2.0+snapshot-20171219 qemuriscv64 /dev/console qemuriscv64 login: root Password: root@qemuriscv64:~# ifconfig -a eth0      Link encap:Ethernet  HWaddr EE:E1:E2:E3:E4:EA           UP BROADCAST RUNNING  MTU:1500  Metric:1           RX packets:1 errors:0 dropped:1 overruns:0 frame:0           TX packets:13 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000           RX bytes:1500 (1.4 KiB)  TX bytes:2346 (2.2 KiB) lo        Link encap:Local Loopback           inet addr:127.0.0.1  Mask:255.0.0.0           UP LOOPBACK RUNNING  MTU:65536  Metric:1           RX packets:0 errors:0 dropped:0 overruns:0 frame:0           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B) root@qemuriscv64:~# On 06/04/18 17:00, 陈东维 wrote:

I haven't tried that option. Usually sharing the ethernet card between a VM and a Windows Host causes issues, but you can experiment preferably without NAT to begin with. On 06/04/18 17:47, 陈东维 wrote:

I'm pleased you got it working but the issue you are having is not entirely explained by capacity. I have achieved success with a claimed 32GB Samsung SD-card (recognised as 29.8GB mmc0:59b4) by Linux. I can believe that different manufacturers would have different compatibility issues, because each make of SD-card has its own processor and associated eccentricities. The specification tries to hide the discrepancies of the medium behind a uniform interface with greater or lesser success. The cheaper cards are optimised for MSDOS filing system use, so can struggle with ext3 or swap usage. As an academic project we do not have the resources to test every possible card that users might want to use. But the benefits of choosing a low cost commodity board outweigh any concerns with signal integrity. These factors would have to be investigated more carefully if an end-user wanted to commercialise the project. On 10/04/18 07:15, Chen Dongwei wrote: