首先是使用相应的SD卡制作的系统启动程序u-boot.bin和ML0以及Linux操作系统的内核uImage文件，放在SD卡的p1分区，同样的讲Linux的根文件系统放在了SD卡的p2分区当中，制作完成的SD卡是完全可以使用的，但是今天拿出来就突然不能用了，在另一块相同的办卡上SD卡时可以正常运行的，串口打印的相关信息如下：
U-Boot 2010.06 (Jun 02 2015 - 04:54:06)
TI8148-GP rev 3.0
ARM clk: 600MHz
DDR clk: 400MHz
DRAM: 2 GiB
MMC: OMAP SD/MMC: 0
Using default environment
The 2nd stage U-Boot will now be auto-loaded
Please do not interrupt the countdown till TI8148_EVM prompt if 2nd stage is already flashed
Hit any key to stop autoboot: 0
reading u-boot.bin
186836 bytes read
## Starting application at 0x80800000 ...
U-Boot 2010.06 (Jun 02 2015 - 05:51:17)
TI8148-GP rev 3.0
ARM clk: 600MHz
DDR clk: 400MHz
I2C: ready
DRAM: 2 GiB
NAND: HW ECC BCH8 Selected
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xc3 (Micron NAND 1GiB 3,3V 16-bit)
NAND bus width 8 instead 16 bit
No NAND device found!!!
0 MiB
MMC: OMAP SD/MMC: 0
*** Warning - bad CRC or MMC, using default environment
.:;rrr;;.
,5#@@@@#####@@@@@@#2,
,A@@@hi;;;r5;;;;r;rrSG@@@A,
r@@#i;:;s222hG;rrsrrrrrr;ri#@@r
:@@hr:r;SG3ssrr2r;rrsrsrsrsrr;rh@@:
B@H;;rr;3Hs;rrr;sr;;rrsrsrsrsrsr;;H@B
@@s:rrs;5#;;rrrr;r#@H:;;rrsrsrsrsrr:s@@
@@;;srs&X#9;r;r;;,2@@@rrr:;;rrsrsrsrr;;@@
@@;;rrsrrs@MB#@@@@@###@@@@@@#rsrsrsrsrr;;@@
G@r;rrsrsr;#X;SX25Ss#@@#M@#9H9rrsrsrsrsrs;r@G
@9:srsrsrs;2@;:;;:.X@@@@@H::;rrsrsrsrsrsrr:3@
X@;rrsrsrsrr;XAi;;:&@@#@Bs:rrsrsrsrsrsrsrsrr;@X
@#;rsrsrsrsrr;r2ir@@@###::rrsr
U-Boot 2010.06 (Jun 02 2015 - 04:54:06)
TI8148-GP rev 3.0
ARM clk: 600MHz
DDR clk: 400MHz
DRAM: 2 GiB
MMC: OMAP SD/MMC: 0
Using default environment
The 2nd stage U-Boot will now be auto-loaded
Please do not interrupt the countdown till TI8148_EVM prompt if 2nd stage is already flashed
Hit any key to stop autoboot: 0
reading u-boot.bin
186836 bytes read
## Starting application at 0x80800000 ...
U-Boot 2010.06 (Jun 02 2015 - 05:51:17)
TI8148-GP rev 3.0
ARM clk: 600MHz
DDR clk: 400MHz
I2C: ready
DRAM: 2 GiB
NAND: HW ECC BCH8 Selected
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xc3 (Micron NAND 1GiB 3,3V 16-bit)
NAND bus width 8 instead 16 bit
No NAND device found!!!
0 MiB
MMC: OMAP SD/MMC: 0
*** Warning - bad CRC or MMC, using default environment
.:;rrr;;.
,5#@@@@#####@@@@@@#2,
,A@@@hi;;;r5;;;;r;rrSG@@@A,
r@@#i;:;s222hG;rrsrrrrrr;ri#@@r
:@@hr:r;SG3ssrr2r;rrsrsrsrsrr;rh@@:
B@H;;rr;3Hs;rrr;sr;;rrsrsrsrsrsr;;H@B
@@s:rrs;5#;;rrrr;r#@H:;;rrsrsrsrsrr:s@@
@@;;srs&X#9;r;r;;,2@@@rrr:;;rrsrsrsrr;;@@
@@;;rrsrrs@MB#@@@@@###@@@@@@#rsrsrsrsrr;;@@
G@r;rrsrsr;#X;SX25Ss#@@#M@#9H9rrsrsrsrsrs;r@G
@9:srsrsrs;2@;:;;:.X@@@@@H::;rrsrsrsrsrsrr:3@
X@;rrsrsrsrr;XAi;;:&@@#@Bs:rrsrsrsrsrsrsrsrr;@X
@#;rsrsrsrsrr;r2i
这里会一直反复打印上面的信息，能看到在打印字符串的过程中系统突然中断了，并重新看是运行，这是为什么呢？这里也看到成功读取了SD卡上的uboot.bin的文件！！这该如何解释呀，下面的时正常启动的相关信息：
U-Boot 2010.06 (Jun 02 2015 - 04:54:06)
TI8148-GP rev 3.0
ARM clk: 600MHz
DDR clk: 400MHz
DRAM: 2 GiB
MMC: OMAP SD/MMC: 0
Using default environment
The 2nd stage U-Boot will now be auto-loaded
Please do not interrupt the countdown till TI8148_EVM prompt if 2nd stage is already flashed
Hit any key to stop autoboot: 0
reading u-boot.bin
186836 bytes read
## Starting application at 0x80800000 ...
U-Boot 2010.06 (Jun 02 2015 - 05:51:17)
TI8148-GP rev 3.0
ARM clk: 600MHz
DDR clk: 400MHz
I2C: ready
DRAM: 2 GiB
NAND: HW ECC BCH8 Selected
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xc3 (Micron NAND 1GiB 3,3V 16-bit)
NAND bus width 8 instead 16 bit
No NAND device found!!!
0 MiB
MMC: OMAP SD/MMC: 0
*** Warning - bad CRC or MMC, using default environment
.:;rrr;;.
,5#@@@@#####@@@@@@#2,
,A@@@hi;;;r5;;;;r;rrSG@@@A,
r@@#i;:;s222hG;rrsrrrrrr;ri#@@r
:@@hr:r;SG3ssrr2r;rrsrsrsrsrr;rh@@:
B@H;;rr;3Hs;rrr;sr;;rrsrsrsrsrsr;;H@B
@@s:rrs;5#;;rrrr;r#@H:;;rrsrsrsrsrr:s@@
@@;;srs&X#9;r;r;;,2@@@rrr:;;rrsrsrsrr;;@@
@@;;rrsrrs@MB#@@@@@###@@@@@@#rsrsrsrsrr;;@@
G@r;rrsrsr;#X;SX25Ss#@@#M@#9H9rrsrsrsrsrs;r@G
@9:srsrsrs;2@;:;;:.X@@@@@H::;rrsrsrsrsrsrr:3@
X@;rrsrsrsrr;XAi;;:&@@#@Bs:rrsrsrsrsrsrsrsrr;@X
@#;rsrsrsrsrr;r2ir@@@###::rrsrsrsrsrsrsrsrsr:@@
@A:rrsrsrsrr;:2@29@@M@@@;:;rrrrsrsrsrsrsrsrs;H@
@&;rsrsrsrr;A@@@@@@###@@@s::;:;;rrsrsrsrsrsr;G@
@#:rrsrsrsr;G@5Hr25@@@#@@@#9XG9s:rrrrsrsrsrs:#@
M@;rsrsrsrs;r@&#;::S@@@@@@@M@@@@Grr:;rsrsrsr;@#
:@s;rsrsrsrr:M#Msrr;;&#@@@@@@@@@@H@@5;rsrsr;s@,
@@:rrsrsrsr;S@rrrsr;:;r3MH@@#@M5,S@@irrsrr:@@
@A:rrsrsrsrrrrrsrsrrr;::;@##@r:;rH@h;srr:H@
;@9:rrsrsrsrrrsrsrsrsr;,S@Hi@i:;s;MX;rr:h@;
r@B:rrrrsrsrsrsrsrr;;sA@#i,i@h;r;S5;r:H@r
,@@r;rrrsrsrsrsrr;2BM3r:;r:G@:rrr;;r@@,
B@Mr;rrrrsrsrsr@@S;;;rrr:5M;rr;rM@H
.@@@i;;rrrrsrs2i;rrrrr;r@M:;i@@@.
.A@@#5r;;;r;;;rrr;r:r#AsM@@H.
;&@@@@MhXS5i5SX9B@@@@G;
:ihM#@@@@@##hs,
Net: ->cpsw_pad_config()
<ethaddr> not set. Reading from E-fuse
Detected MACID:84:7e:40:d2:df:dc
miiphy_register: added 'cpsw', read=0x80721c10, write=0x80721c7c
cpsw
Hit any key to stop autoboot: 0
reading boot.scr
308 bytes read
Running bootscript from MMC/SD to set the ENV...
## Executing script at 80900000
reading uImage
3105852 bytes read
## Booting kernel from Legacy Image at 81000000 ...
Image Name: Linux-2.6.37
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3105788 Bytes = 3 MiB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK
Starting kernel ...
