問題：ubi默認分配空間不合適，想把ubi的分配空間擴大點，如何設置？
米爾技術支持答：要調整NAND分區需要修改u-boot 和 內核的設備樹，二者保持一致。u-boot修改include/configs/myd_c335x.h 里面的NAND.rootfs分區的大小，（NAND.userdata前面的`-`代表剩余的部分全部預留給NAND.userdata)。
508 #define MTDPARTS_DEFAULT "mtdparts=nand.0:" \
509 "512k(NAND.SPL)," \
510 "512k(NAND.SPL.backup1)," \
511 "512k(NAND.SPL.backup2)," \
512 "512k(NAND.SPL.backup3)," \
513 "512k(NAND.u-boot-spl-os)," \
514 "1m(NAND.u-boot)," \
515 "512k(NAND.u-boot-env)," \
516 "512k(NAND.u-boot-env.backup1)," \
517 "8m(NAND.kernel)," \
518 "214m(NAND.rootfs)," \
519 "-(NAND.userdata)"
內核修改設備樹文件里面的NAND.rootfs分區和NAND.userdata分區的大小， 將NAND.rootfs的大小0x0D600000增大，同時將NAND.userdata的起始地址0x0E000000 后移。
（NAND.userdata分區size為0代表剩余的空間全部分給NAND.userdata)
...
528 partition@5 {
529 label = "NAND.u-boot";
530 reg = <0x000c0000 0x00100000="">;
531 };
532 partition@6 {
533 label = "NAND.u-boot-env";
534 reg = <0x001c0000 0x00020000="">;
535 };
536 partition@7 {
537 label = "NAND.u-boot-env.backup1";
538 reg = <0x001e0000 0x00020000="">;
539 };
540 partition@8 {
541 label = "NAND.kernel";
542 reg = <0x00200000 0x00800000="">;
543 };
544 partition@9 {
545 label = "NAND.rootfs";
546 reg = <0x00a00000 0x0d600000="">;
547 };
548 partition@10 {
549 label = "NAND.userdata";
550 reg = <0x0e000000 0="">;
551 };