Booting linux-3.14.41 on ZC706: Kernel Panic - linux-kernel

Question

I get the following error while booting linux-3.14.4 on FPGA ZC706. I have build all tools following ways:
Rocket-Chip:
$ Latest master branch is checked out and generate boot.bin
riscv-gnu-toolchain:
$ ./build.sh (riscv64-unknown-elf)
$ make linux (for riscv64-unknown-linux-gnu-gcc)
Linux kernel:
$curl -L https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.14.41.tar.xz | tar -xJkf -
$ cd linux-3.14.41
$ git init
$ git remote add origin https://github.com/riscv/riscv-linux.git
$ git fetch
$ git checkout -f -t origin/master
$ make ARCH=riscv defconfig
$ make -j12 ARCH=riscv vmlinux
Root disc image:
$ dd if=/dev/zero of=root.bin bs=1M count=64
$ mkfs.ext2 -F root.bin
Booting:
1. First copy all files (vmlinux, root.bin, boot.bin, devicetree.dtb, uImage, uramdisk.image.gz) into sdcard.
(2) $ mkdir /sdcard
$ mount /dev/mmcblk0p1 /sdcard
$ ./fesvr-zynq +disk=/sdcard/riscv/root.bin bbl /sdcard/riscv/vmlinux
Booting starts, but stuck at a point. The following are the booting error
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x00200000-0x0fffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x00200000-0x0fffffff]
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 64135
[ 0.000000] Kernel command line: root=/dev/htifblk0
[ 0.000000] PID hash table entries: 1024 (order: 1, 8192 bytes)
[ 0.000000] Dentry cache hash table entries: 32768 (order: 6, 262144 bytes)
[ 0.000000] Inode-cache hash table entries: 16384 (order: 5, 131072 bytes)
[ 0.000000] Sorting __ex_table...
[ 0.000000] Memory: 253568K/260096K available (1725K kernel code, 120K rwdata, 356K rodata, 68K init, 211K bss, 6528K reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:2
[ 0.150000] Calibrating delay using timer specific routine.. 20.01 BogoMIPS (lpj=100074)
[ 0.150000] pid_max: default: 32768 minimum: 301
[ 0.150000] Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
[ 0.150000] Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes)
[ 0.150000] devtmpfs: initialized
[ 0.150000] NET: Registered protocol family 16
[ 0.150000] bio: create slab <bio-0> at 0
[ 0.150000] Switched to clocksource riscv_clocksource
[ 0.150000] NET: Registered protocol family 2
[ 0.150000] TCP established hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.150000] TCP bind hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.150000] TCP: Hash tables configured (established 2048 bind 2048)
[ 0.150000] TCP: reno registered
[ 0.150000] UDP hash table entries: 256 (order: 1, 8192 bytes)
[ 0.150000] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[ 0.150000] NET: Registered protocol family 1
[ 0.150000] futex hash table entries: 256 (order: 0, 6144 bytes)
[ 0.150000] io scheduler noop registered
[ 0.150000] io scheduler cfq registered (default)
[ 0.170000] htifcon htif1: detected console
[ 0.180000] console [htifcon0] enabled
[ 0.180000] htifblk htif2: detected disk
[ 0.180000] htifblk htif2: added htifblk0
[ 0.180000] TCP: cubic registered
[ 0.180000] VFS: Mounted root (ext2 filesystem) readonly on device 254:0.
[ 0.180000] devtmpfs: error mounting -2
[ 0.180000] Freeing unused kernel memory: 68K (ffffffff80000000 - ffffffff80011000)
[ 0.180000] Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/init.txt for guidance.
[ 0.180000] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.41-g2317c43-dirty #2
[ 0.180000] Call Trace:
[ 0.180000] [<ffffffff80012f54>] walk_stackframe+0x0/0xc8
[ 0.180000] [<ffffffff801bbff4>] panic+0xb4/0x1c4
[ 0.180000] [<ffffffff80012a24>] sys_rt_sigreturn+0x140/0x178
[ 0.180000] [<ffffffff801bba08>] rest_init+0x80/0x84
[ 0.180000] [<ffffffff801bbafc>] kernel_init+0xf0/0xf4
[ 0.180000] [<ffffffff801bba08>] rest_init+0x80/0x84
Can anyone help me, whether I miss anything. I also tried with
linux-3.14.33; the same error comes

Answer 1

I can now boot kernel on SPIKE ISA as well as FPGA. I omit some steps while building root.bin mentioned at https://github.com/riscv/riscv-tools.
$ dd if=/dev/zero of=root.bin bs=1M count=64
$ mkfs.ext2 -F root.bin
will generate empty root.bin. We need to mount disc image and complete the file systems after completing busy box building as mentioned at https://github.com/riscv/riscv-tools