linux-kernel - Re: [PATCH 0/5] Bring the BusLogic host bus adapter driver up to Y2021

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Message-ID: <d7dc08a6-92be-e524-1f11-cd9f7326a0fd@gonehiking.org>
Date:   Mon, 19 Apr 2021 20:16:20 -0600
From:   Khalid Aziz <khalid@...ehiking.org>
To:     "Maciej W. Rozycki" <macro@...am.me.uk>,
        Ondrej Zary <linux@...y.sk>
Cc:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Christoph Hellwig <hch@....de>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] Bring the BusLogic host bus adapter driver up to
 Y2021

On 4/19/21 10:01 AM, Maciej W. Rozycki wrote:
> On Mon, 19 Apr 2021, Khalid Aziz wrote:
> 
>> On 4/18/21 2:21 PM, Ondrej Zary wrote:
>>>
>>> Found the 3000763 document here:
>>> https://doc.lagout.org/science/0_Computer Science/0_Computer History/old-hardware/buslogic/3000763_PCI_EISA_Wide_SCSI_Tech_Ref_Dec94.pdf
>>>
>>> There's also 3002593 there:
>>> https://doc.lagout.org/science/0_Computer Science/0_Computer History/old-hardware/buslogic/
>>>
>>
>> Thanks!!!
> 
>  Ondrej: Thanks a lot indeed!  These documents seem to have the essential 
> interface details all covered, except for Fast-20 SCSI adapters, which I 
> guess are a minor modification from the software's point of view.
> 
>  Khalid: I have skimmed over these documents and I infer 24-bit addressing 
> can be verified with any MultiMaster adapter, including ones that do have 
> 32-bit addressing implemented, by using the legacy Initialize Mailbox HBA 
> command.  That could be used to stop Christoph's recent changes for older 
> adapter support removal and replace them with proper fixes for whatever 
> has become broken.  Is that something you'd be willing as the driver's 
> maintainer to look into, or shall I?
> 

Hi Maciej,

Do you mean use OpCode 01 (INITIALIZE MAILBOX) to set a 24-bit address
for mailbox in place of OpCode 81? Verifying the change would be a
challenge. Do you have an old adapter to test it with? If you do, go
ahead and make the changes. I will be happy to review. I have only a
BT-757 adapter.

Thanks,
Khalid