Re: [9fans] building blocks speaking 9p

[David Boddie <david@boddie.org.uk>]

I'll try and write something useful about it this weekend, and I'll push
a branch up to BitBucket/GitLab:

  https://bitbucket.org/dboddie/inferno-os/branches/
  https://gitlab.com/dboddie/inferno-os/-/branches

However, it basically boils down to this:

 * Build Inferno's tc and tl since they are not included in the default
   build.
 * Fix the tl mkfile so that it calls the executable tl not 5l.
 * Write a mkfile with all the rules for 5a, tc and tl, setting the text
   address to 0x08000000 (flash) and data to 0x20000000 (RAM).
 * Write a loader file to set up the stack and static base registers, copy
   data into RAM, and jump into main.

I have some functions for setting up clocks, GPIOs and the USART. This is
currently in a separate repository for bare metal tests. I'll push that up
to GitLab.

David

On Friday, 28 January 2022 22:46:28 CET Tony Mendoza wrote:
> Any interest in sharing those hints for building bare metal STM32F405
> code om plan9?
> T
> On 1/28/2022 at 3:34 PM, david@boddie.org.uk wrote:On 2022-01-28
> 
> 2:55:00, Thaddeus Woskowiak wrote:
> > One compiler that we really need is an arm thumb 2 compiler for
> 
> cortex-m/r
> 
> > microcontrollers. Inferno has a very old and very incomplete arm
> 
> thumb 1
> 
> > compiler, tc. I don't know if it's worth salvaging.
> 
> I am using 5a/tc/tl to build bare metal code for a STM32F405 MCU
> thanks
> to some hints from Charles Forsyth.
> 
> I'm currently trying to add FP support and learn about compiler
> internals.
> It also means learning about Thumb-2, which is quite alien for an
> old-school
> ARM coder.
> 
> David
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