This happens because in the .config all of the following conditions are met:
1. CONFIG_FB_LOGO_EXTRA=y
2. CONFIG_LOGO_LINUX_CLUT224 is not set
3. CONFIG_LOGO_LINUX_MONO=y and/or CONFIG_LOGO_LINUX_VGA16=y
Apparently the code to draw the (224-color) extra logos uses properties from
the main logo, even if the number of color differs.
http://bugzilla.kernel.org/show_bug.cgi?id=12181
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium