On Mon, Aug 14, 2006 at 12:32:32PM -0700, H. Peter Anvin wrote: > Vivek Goyal wrote: > >On Mon, Aug 14, 2006 at 10:04:29AM -0700, H. Peter Anvin wrote: > >>Vivek Goyal wrote: > >>>On Thu, Aug 10, 2006 at 02:09:58PM -0600, Eric W. Biederman wrote: > >>>>>I just reserved memory at non 2MB aligned location [EMAIL PROTECTED] so > >>>>>that > >>>>>kernel is loaded at 16MB and other smaller segments below the > >>>>>compressed > >>>>>image, then I can successfully booted into the kdump kernel. > >>>>:) > >>>> > >>>>>So basically kexec on panic path seems to be clean except stomping > >>>>>issue. > >>>>>May be bzImage program header should reflect right "MemSize" which > >>>>>takes into account extra memory space calculations. > >>>>Yes. That sounds like the right thing to do. > >>>> > >>>>I remember trying to compute a good memsize when I created the bzImage > >>>>header but it is completely possible I missed some part of the > >>>>calculation or assumed that the kernels .bss section would always be > >>>>larger than what I needed for decompression. > >>>> > >>Could someone please describe the intended semantics of this MemSize > >>header, *and* its intended usage? > >> > > > >Now and ELF header(attached to bzImage) is being used to describe > >the kernel executable. One program header of PT_LOAD type is being > >created. The "p_filesz" field of program header is basically > >describing the vmlinux file size and "p_memsz" is giving how > >much memory will be consumed by kernel image at load time. > > > >Ideally "p_memsz" should be "p_memsz" summation of all the program > >headers of vmlinux file but I guess in this case we are stretching the > >ELF specification a little bit and also taking into the account the > >additional memory which will be used by decompressor and decompression > >logic by the time execution is transferred to the actual kernel. > > > > What about once the kernel is booted? >
Sorry did not understand the question. Few more lines will help. Thanks Vivek _______________________________________________ fastboot mailing list [email protected] https://lists.osdl.org/mailman/listinfo/fastboot
