Yes, exactly. If you need to handle timer interrupts as well, the irq handler capalility for that irq number will need to be passed to the other task. Cheers, Anna. On 30/06/2016 9:08 am, Norrathep Rattanavipanon wrote: I see. Thanks for the info. So by default, the root task has complete control over physical address containing gpt data. And if I want to use the gpt inside a different task, the root task has to pass its capability to that task. Without that, any non-root task wouldnt be able to access it. Am I understanding the timer's capability access control correctly? Oak On Tue, Jun 28, 2016 at 8:39 PM, Norrathep Rattanavipanon <<mailto:nrattana@uci.edu>nrattana@uci.edu<mailto:nrattana@uci.edu>> wrote: Thanks Anna. We are looking for a way to get timestamp (wall clock) that can be used in the userland for authenticating an incoming message from remote server. I see that the real-time clock driver is not implemented yet but an accurate timer would do the job too. So any recommendation on which timer implementation to use? Would this one work? https://github.com/seL4/libsel4platsupport/blob/master/src/mach/imx/timer.c Thanks, Oak On Tue, Jun 28, 2016 at 5:17 PM, Norrathep Rattanavipanon <<mailto:nrattana@uci.edu>nrattana@uci.edu<mailto:nrattana@uci.edu>> wrote: Hi, I was wondering if there's any real time clock implementation for I.MX6 in sel4. And if there isnt any, what would be the best way to use a timer in sel4 (since I saw many implementations of those)? through sel4platsupport_get_default_timer? Best, Oak -- Norrathep (Oak) Rattanavipanon M.S. in Computer Science University of California - Irvine -- Norrathep (Oak) Rattanavipanon M.S. in Computer Science University of California - Irvine -- Norrathep (Oak) Rattanavipanon M.S. in Computer Science University of California - Irvine _______________________________________________ Devel mailing list Devel@sel4.systems<mailto:Devel@sel4.systems> https://sel4.systems/lists/listinfo/devel -- Anna Lyons Kernel engineer / PhD Student DATA61 | CSIRO E anna.lyons@nicta.com.au<mailto:anna.lyons@nicta.com.au> www.data61.csiro.au<http://www.data61.csiro.au> CSIRO's Digital Productivity business unit and NICTA have joined forces to create digital powerhouse Data61 ________________________________ The information in this e-mail may be confidential and subject to legal professional privilege and/or copyright. National ICT Australia Limited accepts no liability for any damage caused by this email or its attachments.