From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mail-wm1-f54.google.com ([209.85.128.54]) by ewsd; Sat Jun 13 22:43:41 EDT 2020
Received: by mail-wm1-f54.google.com with SMTP id c71so11359705wmd.5
        for <9front@9front.org>; Sat, 13 Jun 2020 19:43:36 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=shaposhnik-org.20150623.gappssmtp.com; s=20150623;
        h=mime-version:references:in-reply-to:from:date:message-id:subject:to;
        bh=RHu4BWJP84FOEGGhikA3dvMxjxfSQIDriImjHEyrUAk=;
        b=wJLZqg2lNlKWa9h+Fw5J2iCyUQruSso0tMQiOcnj+MjDgvuloseZ1HEuPJApTrK2Ia
         Tqv+VWhg1rS53W2VJZSo6mK75a84WdlnNvh6sID/0+2hbMTLX0rnQV/d/4GPjBRIg2iS
         roejG/wjBGpaUQqCcXJRJDnZnJGA3F6eC3aApjbvkGoxZ5MpzNktF07qqGcwzqDNjC5G
         jtHWQ58UHwOHDvr3dceZSFxeP77vJPnhM+MTCMyVdqN4PzWFZ8Z7V5FYGSvwpOgHaen4
         rzHPoMQGobiduxsqGkbn0wXm3gPnpmuix3IdLuSQdUBWtLyOkQBUKPnpDpw3imcNhq6a
         gWbg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:mime-version:references:in-reply-to:from:date
         :message-id:subject:to;
        bh=RHu4BWJP84FOEGGhikA3dvMxjxfSQIDriImjHEyrUAk=;
        b=RKC3JPZex4aRXhEZDEGPz1vIFlJaXs6ENXTp/YoX0BHW0Zh5Rgj2IdqKu8h8EGiRdt
         y32TiGQvhHgi5PYWsM5C9OMYaHwfZIbIyZWe6sbAi+fhUK0hW8IHOimoL9fQeVRSL64Y
         OL4Gc3PXPLoZOaPP6qApir1atz6vDWPk9nKlopijs/UiQeGjvHdduLwk388nUZ1j23u9
         D4Ut31qtN1OZeKC9juYRYGdtbtOf1SrG8gSD3scccuYSAigMHvor/W3OZ7BGXka8U9kJ
         4ak9C5Dlq6lVVHaDom5cBB7ry7eh6AyfLkIbqpgTCsNAoTquOKLrPNf4X0jvEZka1Ppr
         ZcVg==
X-Gm-Message-State: AOAM530CwbppWGCZ9Hs62sGv73ifsdUItMK1tSl1Ag6/9x9MRX67qHVu
	ME2x1dk/RUHlaLSrUpJCbMN7/FIhA35oQozQFj0xrQ==
X-Google-Smtp-Source: ABdhPJyILBwnXf6aUKq7GPmhKr6DWIExA7NVv6veQ3FQQ1L9M2cFumHiqmIMDmX5/G01wgdYw7Z0BFna/AMmu002IBs=
X-Received: by 2002:a7b:c74b:: with SMTP id w11mr6134813wmk.120.1592102615985;
 Sat, 13 Jun 2020 19:43:35 -0700 (PDT)
MIME-Version: 1.0
References: <CA+ULb+t-NZcvVfd+4JuqnxVNJK6hL-FH00WtEVSgN6eCHprSuw@mail.gmail.com>
 <569DDC86AEC17D34C1AD81F064E51646@felloff.net>
In-Reply-To: <569DDC86AEC17D34C1AD81F064E51646@felloff.net>
From: Roman Shaposhnik <roman@shaposhnik.org>
Date: Sat, 13 Jun 2020 19:43:24 -0700
Message-ID: <CA+ULb+u9JtuEnMBpnmTM8yfOwmrRkd8ppK+xAKe5+XWPPjD0xg@mail.gmail.com>
Subject: Re: [9front] 9front and raspberry pi 4 8gb model
To: 9front@9front.org
Content-Type: text/plain; charset="UTF-8"
List-ID: <9front.9front.org>
List-Help: <http://lists.9front.org>
X-Glyph: ➈
X-Bullshit: standard hypervisor 

On Sat, Jun 13, 2020 at 6:56 PM <cinap_lenrek@felloff.net> wrote:
>
> > Btw, the following thread may be helpful:
> > https://lists.denx.de/pipermail/u-boot/2020-April/405216.html
>
> this is probably not the issue. the xhci works fine with the 1gb and 2gb
> variants. and the issue they had was that they missed flushing the
> dcache for the scratchpad memory they hand to the xhci controller.
>
> we do flush the dcache for these regions here:
>
>                 dmaflush(1, ctlr->sbp, ctlr->nscratch*ctlr->pagesize);
>                 dmaflush(1, ctlr->sba, ctlr->nscratch*8);

Upon closer examination you may be right.

That said -- in general I feel that retracing u-boot steps in
supporting USB boot on RPi4 8Gb may be easier than retracing steps of
the Linux kernel.

Thanks,
Roman.