Great job and patch collection for the suniv platform!
However PWM doesn't work in uboot because the wrong addresses are used, neither is PWM0 pin configured.

I fixed it, but I don't know how to submit a patch, so I attached the modified files.
Search "//PATCH START" and "//PATCH END" to quickly find the changes. They're only a few lines.
Attached files are:

uboot-2020.07/arch/arm/include/asm/arch-sunxi/cpu_sun4i.h
uboot-2020.07/arch/arm/include/asm/arch-sunxi/gpio.h
uboot-2020.07/arch/arm/include/asm/arch-sunxi/pwm.h

suniv.zip

Regards!

c-stack.c:55:26: error: missing binary operator before token "("
55 | #elif HAVE_LIBSIGSEGV && SIGSTKSZ < 16384

Hi we have a partially working image based on the V2 firmware from MangoPi

https://github.com/mangopi-sbc/buildroot-mangopi-r

However OTG doesn't work, lsusb prints no info at all with a usb wifi dongle connected.

We set dr_mode to HOST instead of PERIPHERAL

Is there something else we need to do, in addition to this? Unfortunately the repo above has disabled Issue reporting

I've been trying to use the default mangopi defconfig and am encountering some problems:

• mtd subsystem is present along with spinand support in u-boot but lacking the gigadevice spi flash
• usb controllers are notr detected

I fixed the first issue by simply enabling the gigadevice spi flash support in u-boot menuconfig, but no matter what I try I can't get DFU to work at all. Typing usb start just says, no usb controllers found.

How to solve this ?

Number of duplicate files found 3
Number of inodes 713
Number of files 315
Number of fragments 24
Number of symbolic links 342
Number of device nodes 0
Number of fifo nodes 0
Number of socket nodes 0
Number of directories 56
Number of ids (unique uids + gids) 2
Number of uids 2
root (0)
unknown (33)
Number of gids 2
root (0)
unknown (33)
^[[7m>>> Generating filesystem image rootfs.tar^[[27m
mkdir -p /disk0/Charles/linux/allwinner/buildroot-tiny200/output/images
rm -rf /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar
mkdir -p /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar
rsync -auH --exclude=/THIS_IS_NOT_YOUR_ROOT_FILESYSTEM /disk0/Charles/linux/allwinner/buildroot-tiny200/output/target/ /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/target
echo '#!/bin/sh' > /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
echo "set -e" >> /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
echo "chown -h -R 0:0 /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/target" >> /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
PATH="/disk0/Charles/linux/allwinner/buildroot-tiny200/output/host/bin:/disk0/Charles/linux/allwinner/buildroot-tiny200/output/host/sbin:/opt/rh/devtoolset-7/root/usr/bin:/sbin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/usr/X11R6/bin:/home/Charles/.local/bin/pha-all/arcanist/bin:/home/Charles/.local/depot_tools:/home/Charles/.local/bin:/home/Charles/bin:/home/Charles/.local/bin/pha-all/arcanist/bin:/home/Charles/.local/depot_tools" /disk0/Charles/linux/allwinner/buildroot-tiny200/support/scripts/mkusers /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/full_users_table.txt /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/target >> /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
echo "/disk0/Charles/linux/allwinner/buildroot-tiny200/output/host/bin/makedevs -d /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/full_devices_table.txt /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/target" >> /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
printf ' rm -rf /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/target//etc/udev/hwdb.d/\n' >> /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
printf ' \n' >> /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
printf ' (cd /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/target; find -print0 | LC_ALL=C sort -z | tar --pax-option=exthdr.name=%%d/PaxHeaders/%%f,atime:=0,ctime:=0 -cf /disk0/Charles/linux/allwinner/buildroot-tiny200/output/images/rootfs.tar --null --xattrs-include='''*''' --no-recursion -T - --numeric-owner)\n' >> /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
chmod a+x /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
PATH="/disk0/Charles/linux/allwinner/buildroot-tiny200/output/host/bin:/disk0/Charles/linux/allwinner/buildroot-tiny200/output/host/sbin:/opt/rh/devtoolset-7/root/usr/bin:/sbin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/usr/X11R6/bin:/home/Charles/.local/bin/pha-all/arcanist/bin:/home/Charles/.local/depot_tools:/home/Charles/.local/bin:/home/Charles/bin:/home/Charles/.local/bin/pha-all/arcanist/bin:/home/Charles/.local/depot_tools" FAKEROOTDONTTRYCHOWN=1 /disk0/Charles/linux/allwinner/buildroot-tiny200/output/host/bin/fakeroot -- /disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/fakeroot
rootdir=/disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/tar/target
table='/disk0/Charles/linux/allwinner/buildroot-tiny200/output/build/buildroot-fs/full_devices_table.txt'
ln -snf /disk0/Charles/linux/allwinner/buildroot-tiny200/output/host/arm-buildroot-linux-gnueabi/sysroot /disk0/Charles/linux/allwinner/buildroot-tiny200/output/staging
^[[7m>>> Executing post-image script board/allwinner/suniv-f1c100s/scripts/genimage.sh^[[27m
make: *** [target-post-image] Error 1

commit id: ce2217 python3编译不过

出错信息如下：

Regenerate Python/importlib_external.h

from Lib/importlib/_bootstrap_external.py using _freeze_importlib

./Programs/_freeze_importlib importlib._bootstrap_external
./Lib/importlib/_bootstrap_external.py
./Python/importlib_external.h.new
python3.8 ./Tools/scripts/update_file.py ./Python/importlib_external.h ./Python/importlib_external.h.new
python3.8: error while loading shared libraries: libpython3.8.so.1.0: cannot open shared object file: No such file or directory

I can't see the startup messages on the lcd , I don't even have a framebuffer, is the lcd support broken on this kernel version or maybe I'm doing something wrong ?
I'm setting the config using
make sipeed_lichee_nano_defconfig

The hw I'm using is:
sipeed's lichee nano board
800x600 lcd
8 GB tf card

Hello there, would you mind submitting the following patches to the upstream someday? Mainline linux really could use some improvements on X-Powers PMU support and those flash related stuff. Thank you for the provided patches btw, it's great to have a recent LTS kernel running on F1C200s.

0009-Fix-ancient-GDF5-A-series-NAND.patch
0010-Add-AW9523B-GPIO-Expender.patch
0012-Add-AXP199-Support.patch
0013-Add-XT25F128-SPI-NOR.patch
0014-Add-GD5F1GQ5UExxG-SPI-NAND.patch
0015-Workaround-for-old-W25N01G.patch
0016-Add-onchip_ecc_quirk-switch-for-spi-nand.patch

It no longer builds, fresh install:

>>> host-m4 1.4.18 Building
Making all in .
Making all in examples
Making all in lib
  GEN      alloca.h
  GEN      configmake.h
  GEN      arg-nonnull.h
  GEN      warn-on-use.h
  GEN      c++defs.h
  GEN      limits.h
  GEN      unused-parameter.h
  GEN      sys/types.h
  GEN      fcntl.h
  GEN      langinfo.h
  GEN      locale.h
  GEN      spawn.h
  GEN      signal.h
  GEN      stdio.h
  GEN      stdlib.h
  GEN      math.h
  GEN      string.h
  GEN      sys/stat.h
  GEN      sys/time.h
  GEN      time.h
  GEN      wchar.h
  GEN      unistd.h
  GEN      wctype.h
  GEN      sys/wait.h
  CC       gl_avltree_oset.o
  CC       binary-io.o
  CC       c-ctype.o
  CC       c-stack.o
  CC       c-strcasecmp.o
  CC       c-strncasecmp.o
  CC       cloexec.o
  CC       clean-temp.o
  CC       close-stream.o
In file included from /usr/include/signal.h:328,
                 from ./signal.h:52,
                 from c-stack.c:49:
c-stack.c:55:26: error: missing binary operator before token "("
   55 | #elif HAVE_LIBSIGSEGV && SIGSTKSZ < 16384
      |                          ^~~~~~~~
  CC       closein.o
  CC       closeout.o
c-stack.c:134:8: error: variably modified 'buffer' at file scope
  134 |   char buffer[SIGSTKSZ];
      |        ^~~~~~
make[5]: *** [Makefile:1915: c-stack.o] Error 1

It seems glibc library changed in 2021 causing a lot of issues like this, this, this and so on.

Here they talk about this ubuntu patch for m4 1.4.18 (debian\patches\04-fix-sigstksz.patch):

Hi

I am working on a F1C100s board (Lichee Nano) and got the TV out working by disabling the LCD panel. However, I noticed that the data format for /dev/fb0 is strangely YUV in an unusual 32 bit configuration (the last byte is not used).

So it appears to me that in case of the TV out a color conversion from RGB to YUV is missing somewhere in the pipeline.

Is this a bug or did I just misconfigure things?

Hi, your repo builds fine, but the resulting sd card image fails to boot in a MangoPi-R3c, with a kernel panic error. The vendor, MangoPi SBC forked your repo to support the MangoPi-R, but the result is exactly the same, so it appears they made no changes. Link is here. Boot log is as follows:

U-Boot SPL 2020.07 (Jan 29 2022 - 14:44:22 +0000)
DRAM: 64 MiB
Trying to boot from MMC1

U-Boot 2020.07 (Jan 29 2022 - 14:44:22 +0000) Allwinner Technology

CPU: Allwinner F Series (SUNIV)
Model: Allwinner F1C100s Generic Device
DRAM: 64 MiB
MMC: mmc@1c0f000: 0, mmc@1c10000: 1
Setting up a 800x480 lcd console (overscan 0x0)
In: serial
Out: serial
Err: serial
Allwinner mUSB OTG (Peripheral)
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Card did not respond to voltage select!
unrecognized JEDEC id bytes: ff, c8, 51
Failed to initialize SPI flash at 0:0 (error -2)
List of MTD devices:

• spi-nand0
  • device: spi-nand@1
  • parent: spi@1c05000
  • driver: spi_nand
  • type: NAND flash
  • block size: 0x20000 bytes
  • min I/O: 0x800 bytes
  • OOB size: 128 bytes
  • OOB available: 4 bytes
  • 0x000000000000-0x000008000000 : "spi-nand0"
    =========================
    Boot Device: mmc0
    Boot Slot 0: mmc0
    Boot Slot 1: spi-nand
    =========================

Error: "splash_mmc0" not defined

Unknown command 'bmp' - try 'help'
gpio: pin 134 (gpio 134) value is 1
switch to partitions #0, OK
mmc0 is current device
Booting from MMC0...
4327000 bytes read in 703 ms (5.9 MiB/s)

Loading kernel from FIT Image at 81000000 ...

Using 'conf@0' configuration
Trying 'kernel@0' kernel subimage
Description: Linux kernel
Type: Kernel Image
Compression: uncompressed
Data Start: 0x810000cc
Data Size: 4309536 Bytes = 4.1 MiB
Architecture: ARM
OS: Linux
Load Address: 0x80000000
Entry Point: 0x80000000
Hash algo: crc32
Hash value: 538d4a7d
Verifying Hash Integrity ... crc32+ OK

Loading fdt from FIT Image at 81000000 ...

Using 'conf@0' configuration
Trying 'fdt@0' fdt subimage
Description: Flattened Device Tree blob
Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x8141c3d0
Data Size: 15666 Bytes = 15.3 KiB
Architecture: ARM
Hash algo: crc32
Hash value: 61472816
Verifying Hash Integrity ... crc32+ OK
Booting using the fdt blob at 0x8141c3d0
Loading Kernel Image
Loading Device Tree to 817f9000, end 817ffd31 ... OK

Starting kernel ...

[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 5.4.99 (peter@peter-powermatemlxxx) (gcc version 8.4.0 (Buildroot -gfe8d6d3)) #1 Sat Jan 29 14:46:29 GMT 2022
[ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
[ 0.000000] CPU: VIVT data cache, VIVT instruction cache
[ 0.000000] OF: fdt: Machine model: Widora MangoPi R3
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] cma: Reserved 16 MiB at 0x82c00000
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 15883
[ 0.000000] Kernel command line: console=ttyS0,115200 rootwait init=/preinit root=/dev/mtdblock2 rootfstype=squashfs overlayfsdev=/dev/mtdblock3 net.ifnames=0 vt.global_cursor_default=0
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 37232K/64036K available (6144K kernel code, 248K rwdata, 1676K rodata, 1024K init, 225K bss, 10420K reserved, 16384K cma-reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] random: get_random_bytes called from start_kernel+0x254/0x444 with crng_init=0
[ 0.000050] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000145] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000895] Console: colour dummy device 80x30
[ 0.000999] Calibrating delay loop... 203.16 BogoMIPS (lpj=1015808)
[ 0.070272] pid_max: default: 32768 minimum: 301
[ 0.070809] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.070856] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.072807] CPU: Testing write buffer coherency: ok
[ 0.074961] Setting up static identity map for 0x80100000 - 0x80100058
[ 0.076200] devtmpfs: initialized
[ 0.088014] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.088079] futex hash table entries: 256 (order: -1, 3072 bytes, linear)
[ 0.092385] pinctrl core: initialized pinctrl subsystem
[ 0.094995] NET: Registered protocol family 16
[ 0.098722] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.101081] cpuidle: using governor menu
[ 0.141944] SCSI subsystem initialized
[ 0.142353] usbcore: registered new interface driver usbfs
[ 0.142521] usbcore: registered new interface driver hub
[ 0.142683] usbcore: registered new device driver usb
[ 0.143138] mc: Linux media interface: v0.10
[ 0.143264] videodev: Linux video capture interface: v2.00
[ 0.143376] pps_core: LinuxPPS API ver. 1 registered
[ 0.143397] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti [email protected]
[ 0.143457] PTP clock support registered
[ 0.144541] ion_parse_dt_heap_common: id 4 type 4 name cma align 1000
[ 0.145494] Advanced Linux Sound Architecture Driver Initialized.
[ 0.147959] clocksource: Switched to clocksource timer
[ 0.149766] simple-framebuffer 83e89000.framebuffer: framebuffer at 0x83e89000, 0x177000 bytes, mapped to 0x(ptrval)
[ 0.149822] simple-framebuffer 83e89000.framebuffer: format=x8r8g8b8, mode=800x480x32, linelength=3200
[ 0.176647] Console: switching to colour frame buffer device 100x30
[ 0.201899] simple-framebuffer 83e89000.framebuffer: fb0: simplefb registered!
[ 0.232541] thermal_sys: Registered thermal governor 'step_wise'
[ 0.233298] NET: Registered protocol family 2
[ 0.234866] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[ 0.234954] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.235019] TCP bind hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.235071] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.235385] UDP hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 0.235458] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 0.236018] NET: Registered protocol family 1
[ 0.238921] NetWinder Floating Point Emulator V0.97 (double precision)
[ 0.240730] Initialise system trusted keyrings
[ 0.241368] workingset: timestamp_bits=30 max_order=14 bucket_order=0
[ 0.263466] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.264089] jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
[ 0.373445] Key type asymmetric registered
[ 0.373486] Asymmetric key parser 'x509' registered
[ 0.373671] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249)
[ 0.373699] io scheduler mq-deadline registered
[ 0.373717] io scheduler kyber registered
[ 0.389187] suniv-f1c100s-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
[ 0.412792] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[ 0.419091] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pa not found, using dummy regulator
[ 0.420445] printk: console [ttyS0] disabled
[ 0.440774] 1c25400.serial: ttyS0 at MMIO 0x1c25400 (irq = 26, base_baud = 6250000) is a 16550A
[ 0.908290] printk: console [ttyS0] enabled
[ 0.923403] SCSI Media Changer driver v0.25
[ 0.929424] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pc not found, using dummy regulator
[ 0.942542] spi-nand spi0.0: GigaDevice SPI NAND was found.
[ 0.948262] spi-nand spi0.0: 128 MiB, block size: 128 KiB, page size: 2048, OOB size: 128
[ 0.958166] 5 fixed-partitions partitions found on MTD device spi0.0
[ 0.964532] Creating 5 MTD partitions on "spi0.0":
[ 0.969447] 0x000000000000-0x000000100000 : "u-boot"
[ 0.980912] 0x000000100000-0x000000600000 : "kernel"
[ 0.987021] random: fast init done
[ 1.012754] 0x000000600000-0x000003000000 : "rom"
[ 1.182965] 0x000003000000-0x000004000000 : "vendor"
[ 1.253367] 0x000004000000-0x000007000000 : "overlay"
[ 1.436379] random: crng init done
[ 1.450087] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.456625] ehci-platform: EHCI generic platform driver
[ 1.462356] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 1.468681] ohci-platform: OHCI generic platform driver
[ 1.474451] usbcore: registered new interface driver usb-storage
[ 1.481572] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto supply vcc not found, using dummy regulator
[ 1.495453] i2c /dev entries driver
[ 1.499772] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pd not found, using dummy regulator
[ 1.513660] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pe not found, using dummy regulator
[ 1.524686] sun4i-csi 1cb0000.csi: Packed (RAW) format enabled.
[ 1.532723] sunxi-wdt 1c20ca0.watchdog: Watchdog enabled (timeout=16 sec, nowayout=0)
[ 1.542736] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pf not found, using dummy regulator
[ 1.581018] sunxi-mmc 1c0f000.mmc: initialized, max. request size: 16384 KB
[ 1.590483] usbcore: registered new interface driver usbhid
[ 1.596062] usbhid: USB HID core driver
[ 1.600370] sunxi-cedar 1c0e000.video-codec: sunxi cedar version 0.01alpha
[ 1.607609] sunxi-cedar 1c0e000.video-codec: cedar-ve the get irq is 19
[ 1.619918] debugfs: Directory '1c23c00.codec' with parent 'F1C100s Audio Codec' already present!
[ 1.635222] sun4i-codec 1c23c00.codec: Codec <-> 1c23c00.codec mapping ok
[ 1.651432] NET: Registered protocol family 17
[ 1.655998] Key type dns_resolver registered
[ 1.661724] Loading compiled-in X.509 certificates
[ 1.679858] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 1.697854] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 1.704711] ALSA device list:
[ 1.707702] #0: F1C100s Audio Codec
[ 1.712006] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 1.720732] cfg80211: failed to load regulatory.db
[ 1.729793] List of all partitions:
[ 1.733412] 1f00 1024 mtdblock0
[ 1.733422] (driver?)
[ 1.740069] 1f01 5120 mtdblock1
[ 1.740077] (driver?)
[ 1.746616] 1f02 43008 mtdblock2
[ 1.746621] (driver?)
[ 1.753217] 1f03 16384 mtdblock3
[ 1.753224] (driver?)
[ 1.759806] 1f04 49152 mtdblock4
[ 1.759814] (driver?)
[ 1.766337] No filesystem could mount root, tried:
[ 1.766343] squashfs
[ 1.771248]
[ 1.775021] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,2)
[ 1.783357] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.99 #1
[ 1.789085] Hardware name: Allwinner suniv Family
[ 1.793854] [] (unwind_backtrace) from [] (show_stack+0x10/0x14)
[ 1.801635] [] (show_stack) from [] (panic+0xe8/0x2e4)
[ 1.808527] [] (panic) from [] (mount_block_root+0x2bc/0x31c)
[ 1.816008] [] (mount_block_root) from [] (prepare_namespace+0x128/0x188)
[ 1.824538] [] (prepare_namespace) from [] (kernel_init+0x8/0x108)
[ 1.832453] [] (kernel_init) from [] (ret_from_fork+0x14/0x34)
[ 1.839999] Exception stack(0xc2839fb0 to 0xc2839ff8)
[ 1.845047] 9fa0: 00000000 00000000 00000000 00000000
[ 1.853214] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 1.861375] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 1.867985] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,2) ]---

Any idea what might be wrong?

Please consider submitting your patches to mainline u-boot someday, even just parts of it would be helpful for future-proofing.

I need to make i8080 lcd driver for f1c100s, but in kernel there is no driver for this part of tcon controller. I think I can use dma , but there is no information about this mode for f1c100s. There are some realisations for other socs based on mipi interface,but this soc has not mipi.