GSOC project: #4272 BSP Executable Conversion

[Joel Sherrill]

On Tue, Apr 6, 2021 at 6:22 AM Ayushman Mishra <ayushvidushi01 at gmail.com>
wrote:

> I checked all the BSPs having bsp-post-link in their config file (find
> . -name *.cfg | xargs -e grep define | grep bsp-post-link) but
> couldn't find similarity between them (other than "$(OBJCOPY) -O
> binary --strip-all \ $(basename $@)$(EXEEXT) $(basename $@)$(BINEXT) "
> in most of them . Sir I wanted to know is there any specific way to
> categorize them from other BSPs, And I am not able to find similar set
> of commands in rtems 4.11 (since in project description
> "https://devel.rtems.org/ticket/4272" its written that post-link was
> active in earlier versions of rtems).
>

In 4.11, these were under c/src/lib/libbsp. There was a source
reorganization
between 4.11 and 5 to ease the transition to waf. This command finds the
same set of bsp-post-link definitions once you are on the 4.11 branch.

find c/src/lib/libbsp -name "*.cfg" | xargs -e grep post-

I mentioned there was a few patterns of what these do. mrm332.cfg
is creating an S-Record image to download. mvme2100.cfg is creating
a compressed binary with a program prepended that decompresses it
and jumps to it.

I'd suggest using Google Sheets to capture a list of every BSP with
a bsp-post-link stanza and a second column to categorize them based
on the output format. You and I have talked about the compressed
binary with header, S-Records, and mkimage for U-Boot. I would
expect that without those types, you will find similarities and a set
of repeating things that get tailored from BSP to BSP.

Compare two that have the same output format. The S-Record
output ones should be easy to compare.


> Also I have started making a draft on this project and wanted to know
> where I should post it to get some initial reviews on it.
>

This is pressing as is getting an application and draft filed with Google.

--joel


> Thanks, Ayushman
>
> On Mon, Apr 5, 2021 at 9:35 AM Ayushman Mishra <ayushvidushi01 at gmail.com>
> wrote:
> >
> > Boot-loader is used to initialize the hardware device , but is there
> > any way to simulate the boot-loader without hardware?.
> > And I suppose the command "rtems-boot-image" performs somewhat similar
> > function to one of the objective of this project "This project is
> > about capturing the commands and logic needed to convert the RTEMS
> > executable format to the BSP boot loader format"  ( 3rd point of "The
> > boot image tool can:"
> > https://docs.rtems.org/branches/master/user/tools/boot-image.html)
> >
> > Also I think potential mentors of this project are Chris Johns and
> > Joel Sherrill , please correct me if I'm wrong.
> >
> > On Sun, Apr 4, 2021 at 10:27 PM Ayushman Mishra
> > <ayushvidushi01 at gmail.com> wrote:
> > >
> > > Respected Sir,
> > > I went through project description https://devel.rtems.org/ticket/4272
> > > (BSP Executable Conversion) and wanted to take it as GSOC project.
> > > I know python programming ,shell scripting and after working a little
> > > bit on project #4334 "Replace Mongoose with Civetweb" (in which I am
> > > not able to proceed further) I have gained some knowledge about bsp
> > > build system in rtems6.
> > > I have already build tools and bsp xilinx_zynq_a9_qemu  on rtems5 and
> > > rtems6 and package libbsd for bsp erc32 and xilinx_zynq_a9_qemu.
> > >
> > > Also, I have a few doubts regarding project "BSP Executable
> Conversion" :
> > > 1. In description its written to make a command "rtems-exe-convert" ,
> > > I wanted to ask what will be the actual function of this command like
> > > after capturing the commands and logic for converting 'RTEMS
> > > executable format' will it create a boot-loader for specific bsp and
> > > provide it with 'RTEMS executable format' ?,
> > > and also I wanted to ask what is need for this command (or this
> > > project in general) and how will it affect the present building
> > > procedure of rtems?
> > > (like first building the specific tools then installing the particular
> bsp)
> > >
> > > 2. I have build 2 BSP in simulation but wanted to ask are all BSPs
> > > available in rtems able to perfectly build in simulation or do I need
> > > some specific hardware for any BSP.
> > > I would be very thankful if you can please clarify my above doubts and
> > > provide a little guidance about this project.
> > > Thanks, Ayushman
>
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