Re: [MiNT] default kernel build for aranym

[Paul Wratt <paul.wratt@gmail.com>]

np - thanks for quick turn around on this - ARAnyM and MiNT docs (if
referenced) can be updated to reflect this - "2 files needed to test
MiNT with ARAnyM" - this can also be used in ARAnyM "make test" (if it
has one)

On Thu, Apr 12, 2012 at 5:23 AM, Alan Hourihane <alanh@fairlite.co.uk> wrote:
> On 04/11/12 13:04, Paul Wratt wrote:
>> (or MEM_PROT=NO according to MiNT)
>>
>> of the 4 standard versions of aranym, only one uses mmu - so it has to
>> be disabled for the other 3 to boot
>> aranym
>> aranym-mmu
>> aranym-jit
>> aranym-jit-fpu
>> (jit does not work with mmu)
>>
>> You have to know to turn off memory protection, and unless you have an
>> AFROS config you will not know that. The BootstrapArgs is empty by
>> default
>>
>> the problem with its current setting is that unless you "restore mmu"
>> with "mmusetup.prg" (which is not supplied) you can not use memory
>> protection anyway
>>
>> if you try to boot MiNT in ARAnyM with MiNT's current default
>> settings, this is what you get:
>> MMU is disabled
>> root_descriptors: 0
>> pointer_descriptors: 0
>> page_descriptors: 0
>> memory needed for each MMU tree: 0 byte
>> Couldn't initialize memory protection. Please run MINTNP.PRG instead.
>> FATAL ERROR. You must reboot the system.
>> Panic: Bus Error.
>> sr = 2704, pc = 000875ce, fw = 7008, ea = 00000000, ssw = 0000, fa = 00000000
>> Dregs: 00000001 00002304 0000fe06 00000000  00000000 00000000 00000000 00000000
>> Aregs: 00000004 000a7d36 000884cc 0004cc7a  0005e69e 0005e6d2 000c8990 000c8930
>>                                                                  usp = 000c8a0e
>>
>> if you try and boot mint with "aranym-mmu" this is what you get:
>> MMU is disabled
>> root_descriptors: 0
>> pointer_descriptors: 0
>> page_descriptors: 0
>> memory needed for each MMU tree: 0 byte
>> Couldn't initialize memory protection. Please run MINTNP.PRG instead.
>> FATAL ERROR. You must reboot the system.
>> CPU: Double bus fault detected !
>> CPU: Halting
>>
>> This means that grabing any ARAnyM and FreeMiNT daily build is
>> pointless at the moment, unless you already have a working setup.
>>
>> I know that unpacking a daily build is not a simple thing, hence the
>> 2x upgrade scripts I created last year, but I was still hearing
>> reports that "getting MiNT to run is not easy", and I think this is
>> the main cause, at least with ARAnyM. A simple change and a lot of
>> potential problems disappear, with MEM_PROT being properly documented
>> turning it on is not a problem.
>
> Disabled by default.
>
> Thanks for investigating Paul.
>
> Alan.
>