root@vultr:/opt/buildroot-2020.02.3# ln -s board/widora/tiny200/widora_tiny200_defconfig config/
ln: target 'config/' is not a directory: No such file or directory

root@vultr:/opt/buildroot-2020.02.3# ls board/widora/tiny200/widora_tiny200_defconfig
board/widora/tiny200/widora_tiny200_defconfig

INFO: hdimage(sysimage-sdcard.img): writing MBR
INFO: cmd: "mkdir -p "/opt/buildroot-2020.02.3/output/build/genimage.tmp"" (stderr):
INFO: cmd: "rm -rf "/opt/buildroot-2020.02.3/output/build/genimage.tmp"/*" (stderr):
INFO: cmd: "mkdir -p "/opt/buildroot-2020.02.3/output/build/genimage.tmp"" (stderr):
INFO: cmd: "cp -a "/tmp/tmp.MTNKuXOfXM" "/opt/buildroot-2020.02.3/output/build/genimage.tmp/root"" (stderr):
INFO: cmd: "find '/opt/buildroot-2020.02.3/output/build/genimage.tmp/root' -depth -type d -printf '%P\0' | xargs -0 -I {} touch -r '/tmp/tmp.MTNKuXOfXM/{}' '/opt/buildroot-2020.02.3/output/build/genimage.tmp/root/{}'" (stderr):
INFO: cmd: "mkdir -p "/opt/buildroot-2020.02.3/output/images"" (stderr):
INFO: flash(sysimage-flash.img): writing image partition 'u-boot' (0xf0000@0x0)
INFO: flash(sysimage-flash.img): writing image partition 'dtb' (0x10000@0xf0000)
INFO: flash(sysimage-flash.img): writing image partition 'kernel' (0x700000@0x100000)
INFO: flash(sysimage-flash.img): writing image partition 'rootfs' (0x800000@0x800000)
INFO: cmd: "mkdir -p "/opt/buildroot-2020.02.3/output/build/genimage.tmp"" (stderr):
INFO: cmd: "rm -rf "/opt/buildroot-2020.02.3/output/build/genimage.tmp"/*" (stderr):
INFO: cmd: "mkdir -p "/opt/buildroot-2020.02.3/output/build/genimage.tmp"" (stderr):
INFO: cmd: "cp -a "/tmp/tmp.FlkWcxqS5L" "/opt/buildroot-2020.02.3/output/build/genimage.tmp/root"" (stderr):
INFO: cmd: "find '/opt/buildroot-2020.02.3/output/build/genimage.tmp/root' -depth -type d -printf '%P\0' | xargs -0 -I {} touch -r '/tmp/tmp.FlkWcxqS5L/{}' '/opt/buildroot-2020.02.3/output/build/genimage.tmp/root/{}'" (stderr):
INFO: cmd: "mkdir -p "/opt/buildroot-2020.02.3/output/images"" (stderr):
INFO: flash(sysimage-nand.img): writing image partition 'u-boot' (0x80000@0x0)
INFO: flash(sysimage-nand.img): writing image partition 'dtb' (0x20000@0x80000)
INFO: flash(sysimage-nand.img): writing image partition 'kernel' (0x800000@0x100000)
INFO: flash(sysimage-nand.img): writing image partition 'rootfs' (0x7700000@0x900000)
root@test:/opt/buildroot-2020.02.3#
root@test:/opt/buildroot-2020.02.3#

root@test:/opt/buildroot-2020.02.3#
root@test:/opt/buildroot-2020.02.3# ls output/images/ -l
total 186100
-rw-r--r-- 1 root root       578 Aug 10 20:16 boot.scr
-rw-r--r-- 1 root root  16777216 Aug 10 20:52 boot.vfat
-rw-r--r-- 1 root root     12760 Aug 10 20:21 devicetree.dtb
-rw-r--r-- 1 root root  62914560 Aug 10 20:52 rootfs.ext2
lrwxrwxrwx 1 root root        11 Aug 10 20:52 rootfs.ext4 -> rootfs.ext2
-rw-r--r-- 1 root root   2019328 Aug 10 20:52 rootfs.squashfs
-rw-r--r-- 1 root root   5068800 Aug 10 20:52 rootfs.tar
-rw-r--r-- 1 root root  16777216 Aug 10 20:52 sysimage-flash.img
-rw-r--r-- 1 root root 134217728 Aug 10 20:52 sysimage-nand.img
-rw-r--r-- 1 root root  80740352 Aug 10 20:52 sysimage-sdcard.img
-rw-r--r-- 1 root root    397099 Aug 10 20:16 u-boot.bin
-rw-r--r-- 1 root root    450411 Aug 10 20:52 u-boot-sunxi-with-nand-spl.bin
-rw-r--r-- 1 root root    429931 Aug 10 20:16 u-boot-sunxi-with-spl.bin
-rw-r--r-- 1 root root   4122664 Aug 10 20:21 zImage

U-Boot SPL 2020.07 (Aug 10 2020 - 20:16:18 +0800)
DRAM: 64 MiB
Trying to boot from MMC1
Card did not respond to voltage select!
spl: mmc init failed with error: -95
Trying to boot from MMC2
Card did not respond to voltage select!
spl: mmc init failed with error: -95
Trying to boot from sunxi SPI

U-Boot 2020.07 (Aug 10 2020 - 20:16:18 +0800) 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 480x272 lcd console (overscan 0x0)
In:    serial
Out:   vga
Err:   vga
Allwinner mUSB OTG (Peripheral)
starting USB...
No working controllers found
Hit any key to stop autoboot:  0 
Card did not respond to voltage select!
Card did not respond to voltage select!
starting USB...
No working controllers found
USB is stopped. Please issue 'usb start' first.
=> 

...

&spi0 {
        pinctrl-names = "default";
        pinctrl-0 = <&spi0_pins_a>;
        status = "okay";

        flash@0 {
                #address-cells = <1>;
                #size-cells = <1>;
                // compatible = "winbond,w25q128", "jedec,spi-nor";
                compatible = "spi-nand";
                reg = <0>;
                spi-max-frequency = <40000000>;
        };
};
....

    cd configs
    ln -s ../board/widora/tiny200/widora_tiny200_defconfig .
    make widora_tiny200_defconfig

    cd configs
    ln -s ../board/widora/tiny200/widora_tiny200_defconfig .
    make widora_tiny200_defconfig

4.0K	boot.scr
4.0M	boot.vfat
16K	devicetree.dtb
8.7M	rootfs.ext2
0	rootfs.ext4
2.0M	rootfs.squashfs
4.9M	rootfs.tar
16M	sysimage-flash.img
128M	sysimage-nand.img
14M	sysimage-sdcard.img
388K	u-boot.bin
440K	u-boot-sunxi-with-nand-spl.bin
420K	u-boot-sunxi-with-spl.bin
4.0M	zImage