Hi Oak, The map is failing as the user image frames are already mapped in. To map a frame again without unmapping the original frame you need to make a copy of the capability and map that in instead. A single frame cap can only be mapped in once. Cheers, Anna. On 6/07/2016 9:11 AM, Norrathep Rattanavipanon wrote: Hi, I need to access the user image from a user application for verifying that the binary is installed correctly. So I found in bootinfo.h that it contains userImageFrames and its supposed to be the one I'm looking for but it gave me an error when I map the frames via vspace_map_pages(vspace, info->userImageFrames.start, ...) at the root task. The error is : ERROR:sel4utils_map_page_pd:223: Error mapping pages, bailing: 2 What am I doing wrong here? Best, Oak -- 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.