我按照文档的方法，不管用 zip 包，还是 git 抓下来的，都编译不过
错误：
LD [M] fs/udf/udf.ko
LD [M] net/netfilter/xt_pkttype.ko
LD [M] sound/core/snd-hwdep.ko
LD [M] sound/soc/sunxi/spdif/sndspdif.ko
LD [M] sound/soc/sunxi/spdif/sunxi_sndspdif.ko
LD [M] sound/soc/sunxi/spdif/sunxi_spdif.ko
LD [M] sound/usb/snd-usb-audio.ko
LD [M] sound/soc/sunxi/spdif/sunxi_spdma.ko
LD [M] sound/usb/snd-usbmidi-lib.ko
ERROR: build kernel Failed
INFO: use a fake rootfs.ext4.
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.00227654 s, 461 MB/s
mke2fs 1.42.9 (4-Feb-2014)
Filesystem too small for a journal
INFO: ----------------------------------------
INFO: build sun8iw7p1 linux dolphin lichee OK
INFO: ----------------------------------------
