[RFC v3 PATCH 00/25] Allow NOMMU for MULTIPLATFORM

[Peter Korsgaard]

>>>>> "Afzal" == Afzal Mohammed <afzal.mohd.ma at gmail.com> writes:

Hi,

 >> You can build a toolchain and initramfs with Buildroot. Have a look at
 >> the stm32f429 nommu config:
 >> 
 >> https://git.buildroot.net/buildroot/tree/configs/stm32f429_disco_defconfig

 > iiuc, it builds one for Cortex-M. i already had a file system w/
 > busybox compiled using a Cortex-M toolchain (stolen from
 > Pengutronix's OSELAS.Toolchain), which works on Cortex M4 (Vybrid
 > VF610 M4 core). But it does not work here, i.e. on Cortex A, seems the
 > above mentioned also would have the same effect.

Hmm, I'm not sure why a cortex-M toolchain wouldn't work on cortex-A, I
thought the 'M' instruction set was a pure subset of the 'A'.

 > And in buildroot, couldn't see Cortex R option in menuconfig, and
 > selecting Cortex-A's excludes flat binary target & presents only with
 > ELF.

We indeed don't have cortex-R support. I'm not aware of any cortex-R
Linux support.

When you select a cortex-A variant, then we enable MMU support by
default, but you can disable it under toolchain options (Enable MMU) and
then the flat binary option is available.

-- 
Bye, Peter Korsgaard