RSB: add GRUB2 to the tools.

[Chris Johns]

On 11/11/21 9:15 am, Karel Gardas wrote:
> On 11/10/21 11:04 PM, Chris Johns wrote:
>> On 11/11/21 5:32 am, Karel Gardas wrote:
>>> the attach patch adds GRUB2 into the RSB RTEMS tools. Idea is to use
>>> that on amd64 BSP for building bootable images. That's also the reason
>>> why it is used only on 6/rtems-x86_64 bset only.
>>
>> Thank you for adding this and posting it here.
>>
>> Does grub build on all supported hosts, ie Windows, MacOS, FreeBSD and Linux?
> 
> Wow! I've tested only build on Ubuntu 20.04. I'll see what I can do
> about others. FreeBSD (13) is most easy to do here actually.

It may not be possible to build on Windows and MacOS and that may be fine. Maybe
an error is raised if the host type is not supported?

This is a really useful package and it is good we add it.

Chris