The default mode for iMX27 in LTIB is 320×240, but unfortunately it is not the best mode for the deafult (shipped with the ADS) screen.
xorg-server-1.4.2/hw/kdrive/src/kmode.c
— xorg-server-1.4.2/hw/kdrive/src/kmode.c 2009-03-30 19:26:25.000000000 -0300
+++ xorg-server-1.4.2_dev/hw/kdrive/src/kmode.c 2009-03-30 19:31:04.000000000 -0300
@@ -30,6 +30,12 @@
/* H V Hz KHz */
/* FP BP BLANK POLARITY */
+ /* Modeline “240x320x64” modified by hamilton at theforce com br */
+ { 240, 320, 64, 16256,
+ 17, 12, 32, KdSyncNegative,
+ 1, 11, 14, KdSyncNegative,
+ },
+
/* IPAQ modeline:
*
* Modeline “320×240″ 5.7222 320 337 340 352 240 241 244 254”
[]’s
Hamilton Vera