Hi Gedare, For the last few days, I am reading the rtems source code, trying to understand the build system, how a bsp is built. I just has a few questions: - it seems like the configure.ac and Makefile.am for each BSP (c/src/lib/libbsp/) is separate from the BSP source code (bsps/). However not all BSP has configure.ac and Makefile.am, for example, the FVP BSP you said. What is the difference here? - my speculation right now is to create a new folder in c/src/lib/libbsp/ for the VExpress device, put the configure.ac and Makefile.am in and put the source file in bsps/ ?
Best regards, Duc Anh Vào Th 4, 14 thg 4, 2021 vào lúc 12:53 Gedare Bloom <ged...@rtems.org> đã viết: > Hi Duc, > > On Tue, Apr 13, 2021 at 8:57 AM Đức Anh <daut...@gmail.com> wrote: > > > > Dear all, > > > > I want to develop a BSP for ARM Versatile Express platform. My final > purpose is to run Gem5 simulation using RTEMS as the kernel. Now Gem5 only > model Versatile Express device, and I can see RTEMS does not have a BSP for > it yet. > > > > More specifically, the machine type modelled in Gem5 is: > > - Arm Motherboard Express uATX (V2M-P1) > > - The memory map is based on Versatile Express RS1, with RS2 extension > > - Arm CoreTile Express A15x2 (V2P-CA15) as daughterboard. It contains > Cortex-A15 CPU. > > > > In the past, the Realview-pbx-a9 BSP used to run successfully in Gem5, > when they still supported realview machine type. It is not the case now. So > I guess I can reuse the CPU related code in realview-pbx-a9 and just write > new code for the BSP ? > > > Well, the realview pbx a9 is a cortex-a9 device and not an a15. Plus, > I guess the vexpress will have some differences in how it deals with > interrupts and maybe messaging given its tiled architecture? I don't > know too much about it. But, your best bet is probably to try to start > with the FVP bsp, which was only added about 5 months ago and supports > just a Cortex-R52 right now, but probably adding the vexpress RS1 > memory map with the V2P-CA15 is the right way for you to go. > > > I am new to RTEMS so I need some help. Which direction should I head for? > > > Join the devel@rtems.org mailing list for technical email discussions > regarding hacking within RTEMS proper. (The "users" mailing list is a > bit more for people trying to develop/maintain their application > software using RTEMS mostly *fingers crossed* out of the box.) I would > strongly recommend that you get started by following through our > tutorials to get a feel for the tools and development environment: > https://docs.rtems.org/branches/master/user/start/index.html > Read carefully and don't skip steps, or you probably miss something > important that you won't figure out until a couple hours later and > have to redo everything. Since you plan new development, you should > use the `master` branch of RTEMS with the `master` branch of the > rtems-source-builder to build your cross-compiler toolchain. This is > referred to as version '6' although it is not yet a released version. > > Right now we have a lot of new faces on devel@ because of the Google > Summer of Code, so you'll find a lot of other people with questions > and answers about how to get started etc. I would recommend you also > do our GSoC Getting Started part of the tutorial so that you can get > some comfort with the developer workflow and how to make changes in > RTEMS and see them in the recompiled version. > > Finally, for new BSP development, I guess you can start by having a > look at https://docs.rtems.org/branches/master/bsp-howto/index.html > This is an aging document, but still a good resource to understand the > basic ideas about BSP implementation. > > -Gedare > > > Best regards, > > Duc Anh > > _______________________________________________ > > users mailing list > > us...@rtems.org > > http://lists.rtems.org/mailman/listinfo/users >
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