内核编译去掉USB驱动出现启动不了的问题

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我在创龙提供的Linux3.3的内核上，在Device driver选项中去掉USB驱动，结果在启动的过程中出现了
2 P$ j; X: h' G0 K: j: F6 o[    1.601224] Read MAC addr from SPI Flash: ff:ff:ff:ff:ff:ff
& W$ m) `4 t) F) n/ w1 Z5 i[    1.608128] spi_davinci spi_davinci.1: Controller at 0xfef0e000
" `! d' @# z; B$ C/ P1 g[    1.665922] davinci_mdio davinci_mdio.0: davinci mdio revision 1.5
[    1.765823] davinci_mdio davinci_mdio.0: timed out waiting for user access
[    1.773673] davinci_mdio: probe of davinci_mdio.0 failed with error -5
9 x4 Y% Y7 {8 k% ^. T9 [[    1.782316] _regulator_get: spi1.1 supply vcc not found, using dummy regulator
[    1.790613] ads7846 spi1.1: touchscreen, irq 145
[    1.796961] input: ADS7846 Touchscreen as /devices/platform/spi_davinci.1/spi_master/spi1/spi1.1/input/input0
: ~6 N% E0 P, M& V: ?; [' S[    1.811665] omap_rtc omap_rtc: rtc core: registered omap_rtc as rtc0
[    1.818481] omap_rtc: RTC power up reset detected
2 e/ z- c3 x$ m2 {. v7 }  C[    1.824103] i2c /dev entries driver
[    1.831084] lirc_dev: IR Remote Control driver registered, major 253
[    1.837971] IR NEC protocol handler initialized
+ B8 X) [; G; N[    1.842583] IR RC5(x) protocol handler initialized
- ]" x+ n. ], m( ?, |5 \9 ][    1.847554] IR RC6 protocol handler initialized
[    1.852136] IR JVC protocol handler initialized
4 |/ D  C: G6 J; M& L; }[    1.856796] IR Sony protocol handler initialized
[    1.861480] IR RC5 (streamzap) protocol handler initialized
[    1.867170] IR SANYO protocol handler initialized
9 y8 i& b, n: w% l, P( Q[    1.871935] IR MCE Keyboard/mouse protocol handler initialized
, X: b  a6 ]. v[    1.877882] IR LIRC bridge handler initialized
. G3 }# L1 E, {# S/ a8 ?( S1 S[    1.882369] Linux video capture interface: v2.00
[    1.888722] watchdog watchdog: heartbeat 60 sec
[    1.895285] cpuidle: using governor ladder
/ j9 Q. R; r& O* F  O( \4 m[    1.900118] cpuidle: using governor menu
[    1.907499] davinci_mmc davinci_mmc.0: Using DMA, 4-bit mode
: @8 f+ Q- I# f6 X0 V( ?: W( s) \[    1.918396] TCP cubic registered
' U8 p2 k% ~( p" i1 G5 Z[    1.921694] NET: Registered protocol family 17
3 f8 g1 G8 Z+ v[    1.927113] _regulator_get: deviceless supply cvdd not found, using dummy regulator
[    1.942633] console [netcon0] enabled
' \5 ?( y) L) Z[    1.946844] netconsole: network logging started
[    1.951985] davinci_emac davinci_emac.1: using random MAC addr: 72:9d:29:ed:bd:8d
[    1.971301] omap_rtc omap_rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
[    1.981557] Root-NFS: no NFS server address
  `/ p, r4 b5 f, D$ k7 Z! O  K. |[    1.985997] VFS: Unable to mount root fs via NFS, trying floppy.
: X. a* v8 V5 I+ K+ v6 k- O[    1.993259] VFS: Cannot open root device "mmcblk0p2" or unknown-block(2,0)
[    2.000512] Please append a correct "root=" boot option; here are the available partitions:
% o' J4 ?1 J! A" H: \( \% V& s: R[    2.009218] 1f00             128 mtdblock0  (driver?)
[    2.014571] 1f01             512 mtdblock1  (driver?)
[    2.020016] 1f02             512 mtdblock2  (driver?)
[    2.025353] 1f03            4096 mtdblock3  (driver?)
[    2.030825] 1f04          519040 mtdblock4  (driver?)
[    2.036225] 1f05              64 mtdblock5  (driver?)
: ]2 U8 L$ t. g[    2.041536] 1f06             512 mtdblock6  (driver?)
[    2.046904] 1f07              64 mtdblock7
, W" e/ h! c6 h" x& w5 V" r! d2 ~( Y' l[    2.051053] mmc0: host does not support reading read-only switch. assuming write-enable.
7 B# E# z6 m4 ?0 V1 Z[    2.059503]  (driver?)
8 y5 p3 B1 ]' D) j/ g[    2.061933] 1f08            2560 mtdblock8  (driver?)
[    2.067289] 1f09            4096 mtdblock9
[    2.071638] mmc0: new high speed SDHC card at address 1234
( E, P# Z% _; S) ^' m[    2.077485]  (driver?)
! ]. Q' S- a! E$ f[    2.079916] 1f0a              64 mtdblock10  (driver?)
. `! E: x+ y* t4 Z2 f, p+ Q  M" T[    2.085120] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
# A. {# k7 F  }4 K* K  |2 `9 p                                                                                                                                          
去掉I2C驱动后也会出现同样的问题，请各位高手指教

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