Hi Adam, Thank you for prompt answer. I think I have found all L4Linux configuration options related to my task in the following menuconfig’s menu: L4Linux configuration -> Stub drivers -> Here they are (I put corresponding variable in parentheses): [*] Use the rtc server (L4_EXTERNAL_RTC) [ ] Block driver for the generic_blk interface (L4_BLK_DRV) [ ] Block driver for the persistent dataspace interface (L4_PDSPBLK_DRV) [*] Framebuffer driver for l4con and DOpE (input/output) (L4_FB_DRIVER) [ ] Support for the X Window System driver (L4_FB_DRIVER_XF86IF) [ ] Network driver for ORe (L4_ORE_DRV) [*] Pseudo serial driver for console (L4_SERIAL) [*] Serial console support (L4_SERIAL_CONSOLE) [ ] Cons system support (L4_CONS) Meaning of some of these options is clear for me and some of them isn’t. If I’m right: 1. L4_EXTERNAL_RTC option forces L4Linux to use rtc module instead of direct access to timer hardware. 2. As you wrote L4_FB_DRIVER compiles in l4fb module into L4Linux, so it could be used by dope or con server. 3. L4_ORE_DRV adds stub network driver to L4Linux which uses ore server for actual access to NIC. Other isn’t really clear: 1. Help in menuconfig says L4_SERIAL : "Serial type driver used for console". L4_SERIAL_CONSOLE : "you will be able to use the pseudo serial interface as a system console" I can’t get the difference between L4_SERIAL and L4_SERIAL_CONSOLE options. Maybe L4_SERIAL is pseudo COM port driver and L4_SERIAL_CONSOLE is module for system console (I mean ttyLv0). Am I right here? 2. Another confusing thing is that Wiki says console=ttyLv0 options is to use 'l4ser' driver for console. But I don’t load such a module (l4ser) and 'console=ttyLv0' option works. What is 'l4ser'? Is it L4 server? If it's not who controls COM port hardware? Is it done by L4 kernel? 3. You've mentioned "block stub without a real L4 driver". Is it L4_BLK_DRV? Do you have plans to implement the L4 driver? 4. Unfortunately, menuconfig help isn't really comprehensible for me. Could you please explain, in short, what is L4_CONS? 5. And L4_PDSPBLK_DRV? 6. And L4_FB_DRIVER_XF86IF? Best Regards, Alexander Valitov -- View this message in context: http://www.nabble.com/L4Linux-stub-drivers---L4-drivers-tp21852355p21875419.... Sent from the L4 mailing list archive at Nabble.com.