我使用的是ZLG的EasyARM i.MX280A的开发板。官方提供的编译器时arm-fsl-linux-gnueabihf（gcc 4.4.4）。自己尝试使用arm-linaro-linux-gnueabihf（gcc 4.7.3）。
按照开发手册的流程，解决编译上的报错后，得到imx_ivt_uboot.sb文件。
使用官方提供的工具格式化NAND flash，格式化成功，串口终端输出与手册上一致。
按照开发手册，将进行uboot only的烧写，需要提供的文件是imx_ivt_uboot.sb（放在ProfilesMX28 Linux UpdateOS Firmwarefiles目录下），我仅且提供了imx_ivt_uboot.sb来控制变量。
烧写过程串口输出如下：
start bootlets
Mar 7 201610:44:04
FRAC 0x92925552
Wait for ddr ready 1power 0x00820616
Frac 0x92925552
start change cpu freq
hbus 0x00000003
cpu 0x00010001
start test memory accress
ddr2 0x40FFFF00
finish simple test
******ddr2 read write success!
finish simple test
finish boot prep,start to run ...
LLLLLFLCLFLLJUncompressing Linux... done, booting the kernel.
Linux version 2.6.35.3-571-gcca29a0-gea56f1e-dirty (chenhaiman@ubuntuVM) (gcc version 4.4.4 (4.4.4_09.06.2010) ) #8 Tue May 10 16:07:37 CST 2016
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: Freescale MX28EVK board
Memory policy: ECC disabled, Data cache writeback
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: gpmi=g console=ttyAM0,115200n8 ip=192.168.12.180:192.168.12.48:192.68.12.1:255.255.255.0::eht0: fec_mac= ethact mem=64M
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 57568k/57568k available, 7968k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xfde00000 - 0xffe00000 ( 32 MB)
vmalloc : 0xc4800000 - 0xf0000000 ( 696 MB)
lowmem : 0xc0000000 - 0xc4000000 ( 64 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc0024000 ( 112 kB)
.text : 0xc0024000 - 0xc02d9000 (2772 kB)
.data : 0xc02da000 - 0xc02f6e00 ( 116 kB)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Hierarchical RCU implementation.
RCU-based detection of stalled CPUs is disabled.
Verbose stalled-CPUs detection is disabled.
NR_IRQS:288
Console: colour dummy device 80x30
console [ttyAM0] enabled
Calibrating delay loop... 226.09 BogoMIPS (lpj=1130496)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
regulator: core version 0.5
NET: Registered protocol family 16
regulator: vddd: 800 <--> 1575 mV at 1500 mV fast normal
regulator: vdddbo: 800 <--> 1575 mV fast normal
regulator: vdda: 1500 <--> 2275 mV at 1800 mV fast normal
vddio = 3380000, val=10
regulator: vddio: 2880 <--> 3680 mV at 3380 mV fast normal
regulator: overall_current: fast normal
regulator: vbus5v:
regulator: mxs-duart-1: fast normal
regulator: mxs-bl-1: fast normal
regulator: mxs-i2c-1: fast normal
regulator: mmc_ssp-1: fast normal
regulator: mmc_ssp-2: fast normal
regulator: charger-1: fast normal
regulator: power-test-1: fast normal
regulator: cpufreq-1: fast normal
i.MX IRAM pool: 120 KB@0xc4820000
Initializing GPMI pins
usb DR wakeup device is registered
IMX usb wakeup probe
audit: cannot initialize inotify handle
bio: create slab <bio-0> at 0
SCSI subsystem initialized
Switching to clocksource mxs clock source
NET: Registered protocol family 1
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 4096K
Bus freq driver module loaded
mxs_cpu_init: cpufreq init finished
audit: initializing netlink socket (disabled)
type=2000 audit(1.500:1): initialized
JFFS2 version 2.2. (NAND) ? 2001-2006 Red Hat, Inc.
msgmni has been set to 120
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
io scheduler noop registered (default)
mxs-duart.0: ttyAM0 at MMIO 0x80074000 (irq = 47) is a DebugUART
brd: module loaded
loop: module loaded
Loading iSCSI transport class v2.0-870.
i.MX GPMI NFC
NFC: Version 1, 8-chip GPMI and BCH
Boot ROM: Version 1, Single-chip boot area, block mark swapping supported
Scanning for NAND Flash chips...
NAND device: Manufacturer ID: 0xc2, Chip ID: 0xf1 (Unknown NAND 128MiB 3,3V 8-bit)
-----------------------------
NAND Flash Device Information
-----------------------------
Manufacturer : Unknown (0xc2)
Device Code : 0xf1
Cell Technology : SLC
Chip Size : 128 MiB
Pages per Block : 64
Page Geometry : 2048+64
ECC Strength : 4 bits
ECC Size : 512 B
Data Setup Time : 20 ns
Data Hold Time : 10 ns
Address Setup Time: 20 ns
GPMI Sample Delay : 6 ns
tREA : Unknown
tRLOH : Unknown
tRHOH : Unknown
Description : MX30LF1G08AA
-----------------
Physical Geometry
-----------------
Chip Count : 1
Page Data Size in Bytes: 2048 (0x800)
Page OOB Size in Bytes : 64
Block Size in Bytes : 131072 (0x20000)
Block Size in Pages : 64 (0x40)
Chip Size in Bytes : 134217728 (0x8000000)
Chip Size in Pages : 65536 (0x10000)
Chip Size in Blocks : 1024 (0x400)
Medium Size in Bytes : 134217728 (0x8000000)
------------
NFC Geometry
------------
ECC Algorithm : BCH
ECC Strength : 8
Page Size in Bytes : 2112
Metadata Size in Bytes : 10
ECC Chunk Size in Bytes: 512
ECC Chunk Count : 4
Payload Size in Bytes : 2048
Auxiliary Size in Bytes: 16
Auxiliary Status Offset: 12
Block Mark Byte Offset : 1999
Block Mark Bit Offset : 0
-----------------
Boot ROM Geometry
-----------------
Boot Area Count : 1
Boot Area Size in Bytes : 20971520 (0x1400000)
Stride Size in Pages : 64
Search Area Stride Exponent: 2
Boot area protection is enabled.
Creating 7 MTD partitions on "gpmi-nfc-main":
0x000000000000-0x000000c00000 : "reserve"
0x000000c00000-0x000000c80000 : "reserve"
0x000000c80000-0x000000d00000 : "reserve"
0x000000d00000-0x000000f00000 : "bmp"
0x000000f00000-0x000000f80000 : "reserve"
0x000000f80000-0x000004f80000 : "rootfs"
0x000004f80000-0x000008000000 : "opt"
ARC USBOTG Device Controller driver (1 August 2005)
check_parameters:UTP settings are in place now, overriding defaults
g_file_storage gadget: File-backed Storage Gadget, version: 20 November 2008
g_file_storage gadget: Number of LUNs=1
fsl-usb2-udc: bind to driver g_file_storage
This is 5V only build.
mxs-mmc: MXS SSP Controller MMC Interface driver
mxs-mmc mxs-mmc.0: mmc0: MXS SSP MMC DMAIRQ 82 ERRIRQ 96
NET: Registered protocol family 17
Freeing init memory: 112K
init started: BusyBox v1.15.0 ()
starting pid 1633, tty '': '/etc/rc.d/rcS'
Mounting /proc and /sys
mount: mounting tmpfs on /dev failed: Invalid argument
mknod: /dev/console: File exists
Starting the hotplug events dispatcher udevd
Synthesizing initial hotplug events
g_file_storage gadget: high speed config #1
Setting the hostname to freescale
Mounting filesystems
no mount -n -t tmpfs shm /dev/shm
no mount -n -t tmpfs rwfs /mnt/rwfs -o size=512k
*
*
mount: mounting usbfs on /proc/bus/usb failed: No such file or directory
no mount tmpfs /tmp -t tmpfs -o size=16m
Starting inetd:
==========================================================
Common updater program for IMX28 chips,2016/05/11
Guangzhou ZHIYUAN electronics Co.,LTD
==========================================================
*** No SD card detected ***
*** Using USB method ***
uuc 0.4 [built Feb 21 2014 08:19:00]
UTP: Waiting for device to appear
UTP: file/device node /dev/utp already exists
cpu_id is 28
UTP: received command 'mknod class/mtd,mtd0,/dev/mtd0'
class = 'class/mtd'
item = 'mtd0'
node = /dev/mtd0
type = (null)
UTP: running utp_mk_devnode(class/mtd,mtd0,/dev/mtd0,0x2000)
UTP: file/device node /dev/mtd0 already exists
UTP: sending Success
g_file_storage gadget: high speed config #1
UTP: received command '$ nandtest -m -s /dev/urandom /dev/mtd0'
UTP: sending Busy
UTP: executing "nandtest -m -s /dev/urandom /dev/mtd0"
ECC corrections: 0
ECC failures : 0
Bad blocks : 0
BBT blocks : 0
00be0000: checking...
Finished pass 1 successfully
UTP: sending Success
UTP: received command 'send'
UTP: sending Success
UTP: received command '$ kobs-ng init $FILE'
UTP: sending Busy
UTP: executing "kobs-ng init $FILE"
UTP: sending Success
UTP: received command '$ echo Update Complete!'
UTP: sending Busy
UTP: executing "echo Update Complete!"
Update Complete!
UTP: sending Success
g_file_storage gadget: high speed config #1
烧写完成之后，启动开发板串口终端输出如下：
Aug 22 201712:07:35 FRAC 0x92925552 Wait for ddr ready 1Wait for ddr ready 1bank count is 4 power 0x00820616 Frac 0x92925552 start change cpu freq hbus 0x00000003 cpu 0x00010001 start test memory accress ddr2 0x40FFFF00 finish simple test ******ddr2 read write success! finish simple test finish boot prep,start to run ...
进行对比实验，
1.使用官方的uboot可以正常启动，流程操作无误，且证明单单使用imx_ivt_uboot.sb能满足uboot正常启动。
2.使用CPU参数-mfloat-abi=hard和-msoft-float不同的固件imx_ivt_uboot.sb都可以成功烧写入。
结论
1.排除了操作失误影响，每次烧写前格式化保证了不会受前次烧写的影响。
2.rootfs的影响。尚在学习rootfs制作。（怀疑原因：我在前面做了个实验，替换了系统glibc库，结果uboot都不能正常使用了，故怀疑uboot依赖根目录下的库文件）
3.设备与该编译器不兼容。优先级最低，不能证真，若归结到此原因上则没有继续试验必要。
把这个写下来是希望自己深入理解嵌入式后能知道为什么有问题，而不是通过尝试寻找到问题所在。当然如果有嵌入式大神能给予指导更加欢迎。
参考：
1.使用arm-none-linux-gnueabi编译uboot可以正常运行，排除了使用的glibc版本过高而导致的问题。