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From: Paolo Bonzini <pbonzini@redhat.com>
To: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>,
	qemu-devel@nongnu.org, fam@euphon.net, laurent@vivier.eu,
	hpoussin@reactos.org
Subject: Re: [PATCH 4/5] esp: revert 75ef849696 "esp: correctly fill bus id with requested lun"
Date: Fri, 11 Jun 2021 13:38:51 +0200	[thread overview]
Message-ID: <792a6be1-0738-dab1-564e-939567f0d38b@redhat.com> (raw)
In-Reply-To: <3a4aa5ea-2e71-0f32-5d25-f34a90167019@ilande.co.uk>

On 09/06/21 17:31, Mark Cave-Ayland wrote:
> Due to the absence of the IDENTIFY byte in the S case I'm guessing from 
> the patch that the LUN is in encoded in buf[1] (the top bits being 
> "Reserved" according to my copy of the specification).

They used to be the LUN many years ago.

>   static void s_without_satn_pdma_cb(ESPState *s)
>   {
> +    uint8_t busid;
> +
>       if (!esp_get_tc(s) && !fifo8_is_empty(&s->cmdfifo)) {
>           s->cmdfifo_cdb_offset = 0;
>           s->do_cmd = 0;
> -        do_busid_cmd(s, 0);
> +        busid = s->cmdfifo.data[1] >> 5;
> +        do_busid_cmd(s, busid);
>       }
>   }

Considering how obsolete the LUN-in-CDB case is (and now that I actually 
understand that the first byte is a message-phase byte), it is probably 
be more correct to keep the previous busid: with no message phase, the 
previously-selected LUN would be addressed.  I can send a patch for 
this, but it's orthogonal to this one so I queued it as well.

Paolo



  reply	other threads:[~2021-06-11 11:41 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19 10:07 [PATCH 0/5] esp: fixes for MacOS toolbox ROM Mark Cave-Ayland
2021-05-19 10:07 ` [PATCH 1/5] esp: allow non-DMA callback in esp_transfer_data() initial transfer Mark Cave-Ayland
2021-05-19 10:08 ` [PATCH 2/5] esp: handle non-DMA transfers from the target one byte at a time Mark Cave-Ayland
2021-05-19 10:08 ` [PATCH 3/5] esp: ensure PDMA write transfers are flushed from the FIFO to the target immediately Mark Cave-Ayland
2021-05-19 10:08 ` [PATCH 4/5] esp: revert 75ef849696 "esp: correctly fill bus id with requested lun" Mark Cave-Ayland
2021-06-09 12:13   ` Paolo Bonzini
2021-06-09 15:31     ` Mark Cave-Ayland
2021-06-11 11:38       ` Paolo Bonzini [this message]
2021-06-11 11:52         ` Mark Cave-Ayland
2021-05-19 10:08 ` [PATCH 5/5] esp: correctly accumulate extended messages for PDMA Mark Cave-Ayland
2021-05-28  7:11 ` [PATCH 0/5] esp: fixes for MacOS toolbox ROM Mark Cave-Ayland
2021-06-07 11:00   ` Mark Cave-Ayland
2021-06-09 12:13 ` Paolo Bonzini

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