linux-kernel - Re: [RFC v4 03/25] m68k/atari: Move Atari-specific code out of drivers/char/nvram.c

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Message-ID: <CAOmrzkLS0BS8gj1tmkJr3_oXdUp--yOM3esZRodLHs=cAbKupw@mail.gmail.com>
Date:	Thu, 23 Jul 2015 11:46:44 +1200
From:	Michael Schmitz <schmitzmic@...il.com>
To:	Finn Thain <fthain@...egraphics.com.au>,
	Michael Schmitz <schmitzmic@...il.com>,
	Andreas Schwab <schwab@...ux-m68k.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	"Linux/m68k" <linux-m68k@...r.kernel.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RFC v4 03/25] m68k/atari: Move Atari-specific code out of drivers/char/nvram.c

Hi Christian,

if I understand Finn right, he needs the SCSI host ID reported for the
Falcon SCSI chip, as found in this kernel log line:

scsi host0: Atari native SCSI, io_port 0x0, n_io_port 0, base 0x0, irq
15, can_queue 8, cmd_per_lun 1, sg_tablesize 0, this_id 7, flags { },
options { REAL_DMA SUPPORT_TAGS }

(see this_id; output from one of my ARAnyM instances, kernel 3.19rc6).
Also, the SCSI host ID reported by cat /proc/drivers/nvram (also 7, in
my case)

TOS reports the SCSI host ID during boot (when scannig for bootable
disks) IIRC. There may be some control panel to view the NVRAM
settings as well (stuff like default video mode was accessible from
the CT60 control panel so the SCSI host ID might be there as well).

Cheers,

  Michael



On Thu, Jul 23, 2015 at 2:32 AM, Christian T. Steigies <cts@...ian.org> wrote:
> On Wed, Jul 22, 2015 at 02:22:21PM +1000, Finn Thain wrote:
>>
>> On Wed, 22 Jul 2015, Michael Schmitz wrote:
>>
>> > Hi Finn,
>> >
>> > I'm afraid I cannot test anything on Atari hardware at present - my
>> > Falcon ate it's IDE disk partition table with all the fun that entails.
>>
>> That doesn't sound good.
>>
>> > Haven't even begun to try and recover that yet.
>> >
>> > If you send a patch I could build a kernel and send that to Christian
>> > for testing (if he's got his Falcon up and running - might be a tad warm
>> > in the attic for that, in fact).
>>
>> Anyone with a suitable Atari, i.e. ATARIHW_PRESENT(TT_CLK), who can boot
>> both TOS and Linux could resolve the question. (Perhaps with an emulator?)
>
> The Falcon is not powered on currently but it should still work. What should
> I test?
>
>> Any old kernel binary would do, since atari_scsi should print either
>> "HOSTID=n" or "this_id n" at startup.
>>
>> If n doesn't agree with what TOS says about the host's SCSI ID, then I
>> think a trivial patch is safe enough. Especially if cat /proc/driver/nvram
>> produces a "SCSI host ID : m" that does agree with TOS.
>
> Christian
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