[twobob]

[root@kindle bin]# Xfbdev --help

Spoiler:

use: X [:<display>] [option]
-a # default pointer acceleration (factor)
-ac disable access control restrictions
-audit int set audit trail level
-auth file select authorization file
-br create root window with black background
+bs enable any backing store support
-bs disable any backing store support
-c turns off key-click
c # key-click volume (0-100)
-cc int default color visual class
-nocursor disable the cursor
-core generate core dump on fatal error
-dpi int screen resolution in dots per inch
-dpms disables VESA DPMS monitor control
-deferglyphs [none|all|16] defer loading of [no|all|16-bit] glyphs
-f # bell base (0-100)
-fc string cursor font
-fn string default font name
-fp string default font path
-help prints message with these options
-I ignore all remaining arguments
-ld int limit data space to N Kb
-lf int limit number of open files to N
-ls int limit stack space to N Kb
-logo enable logo in screen saver
nologo disable logo in screen saver
-nolisten string don't listen on protocol
-noreset don't reset after last client exists
-reset reset after last client exists
-p # screen-saver pattern duration (minutes)
-pn accept failure to listen on all ports
-nopn reject failure to listen on all ports
-r turns off auto-repeat
r turns on auto-repeat
-render [default|mono|gray|color] set render color alloc policy
-retro start with classic stipple and cursor
-s # screen-saver timeout (minutes)
-t # default pointer threshold (pixels/t)
-terminate terminate at server reset
-to # connection time out
-tst disable testing extensions
ttyxx server started from init on /dev/ttyxx
v video blanking for screen-saver
-v screen-saver without video blanking
-wm WhenMapped default backing-store
-wr create root window with white background
-maxbigreqsize set maximal bigrequest size
+xinerama Enable XINERAMA extension
-xinerama Disable XINERAMA extension
-dumbSched Disable smart scheduling, enable old behavior
-schedInterval int Set scheduler interval in msec
+extension name Enable extension
-extension name Disable extension
-query host-name contact named host for XDMCP
-broadcast broadcast for XDMCP
-multicast [addr [hops]] IPv6 multicast for XDMCP
-indirect host-name contact named host for indirect XDMCP
-port port-num UDP port number to send messages to
-from local-address specify the local address to connect from
-once Terminate server after one session
-class display-class specify display class to send in manage
-cookie xdm-auth-bits specify the magic cookie for XDMCP
-displayID display-id manufacturer display ID for request
[+-]accessx [ timeout [ timeout_mask [ feedback [ options_mask] ] ] ]
enable/disable accessx key sequences
-ardelay set XKB autorepeat delay
-arinterval set XKB autorepeat interval

TinyX Device Dependent Usage:
-screen WIDTH[/WIDTHMM]xHEIGHT[/HEIGHTMM][@ROTATION][X][Y][xDEPTH/BPP{,DEPTH/BPP}[xFREQ]] Specify screen characteristics
-rgba rgb/bgr/vrgb/vbgr/none Specify subpixel ordering for LCD panels
-mouse driver [,n,,options] Specify the pointer driver and its options (n is the number of buttons)
-keybd driver [,,options] Specify the keyboard driver and its options
-zaphod Disable cursor screen switching
-2button Emulate 3 button mouse
-3button Disable 3 button mouse emulation
-rawcoord Don't transform pointer coordinates on rotation
-dumb Disable hardware acceleration
-softCursor Force software cursor
-videoTest Start the server, pause momentarily and exit
-origin X,Y Locates the next screen in the the virtual screen (Xinerama)
-switchCmd Command to execute on vt switch
-zap Terminate server on Ctrl+Alt+Backspace
vtxx Use virtual terminal xx instead of the next available

Xfbdev Device Usage:
-fb path Framebuffer device to use. Defaults to /dev/fb0

and also

[root@kindle bin]# xdm -config /mnt/us/usr/lib/X11/xdm/xdm-config -error /mnt/us/documents/xdm.log.txt

where xdm-config is

Spoiler:

!
!
!
!
!






DisplayManager.authDir: /mnt/us/var/lib/xdm
DisplayManager.errorLogFile: /var/log/xdm.log
DisplayManager.pidFile: /var/run/xdm.pid
DisplayManager.keyFile: /mnt/us/usr/libX11/xdm/xdm-keys
DisplayManager.servers: /mnt/us/usr/libX11/xdm/Xservers
DisplayManager.accessFile: /mnt/us/usr/libX11/xdm/Xaccess
DisplayManager*resources: /mnt/us/usr/libX11/xdm/Xresources
DisplayManager.willing: su nobody -s /bin/sh -c /mnt/us/usr/libX11/xdm/Xwilling
! All displays should use authorization, but we cannot be sure
! X terminals may not be configured that way, so they will require
! individual resource settings.
DisplayManager*authorize: true
!
DisplayManager*chooser: /mnt/us/usr/libX11/xdm/chooser
DisplayManager*startup: /mnt/us/usr/libX11/xdm/Xstartup
DisplayManager*session: /mnt/us/usr/libX11/xdm/Xsession
DisplayManager*reset: /mnt/us/usr/libX11/xdm/Xreset
DisplayManager*authComplain: true
! The following three resources set up display :0 as the console.
DisplayManager._0.setup: /mnt/us/usr/libX11/xdm/Xsetup_0
DisplayManager._0.startup: /mnt/us/usr/libX11/xdm/GiveConsole
DisplayManager._0.reset: /mnt/us/usr/libX11/xdm/TakeConsole

DisplayManager*loginmoveInterval: 10

! SECURITY: do not listen for XDMCP or Chooser requests
! Comment out this line if you want to manage X terminals with xdm
DisplayManager.requestPort: 0

for reference.