linux-kernel - Re: [PATCH 00/06] serial8250: DLL/DLM rework, Emma Mobile UART driver

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Message-ID: <CANqRtoSypEnwgYM+VDL1rn_XvrKCpuKbhDMRkj=c2WSJE38Thw@mail.gmail.com>
Date:	Wed, 9 May 2012 01:34:47 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-serial@...r.kernel.org, horms@...ge.net.au,
	linux-sh@...r.kernel.org, gregkh@...uxfoundation.org,
	swarren@...dotorg.org, linux-kernel@...r.kernel.org, rjw@...k.pl,
	paul.gortmaker@...driver.com, lethal@...ux-sh.org, olof@...om.net,
	dan.j.williams@...el.com, alan@...ux.intel.com
Subject: Re: [PATCH 00/06] serial8250: DLL/DLM rework, Emma Mobile UART driver

On Sat, May 5, 2012 at 1:28 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 02 May 2012, Magnus Damm wrote:
>> Note that there is no DT support included at this point,
>> but it boils down to a 10 line change. The boot loader on
>> my board does not do DT so I'd like to use kexec for DT
>> development (as usual), but to use kexec I first need to
>> get a non-DT kernel working. Which is basically this. =)
>
> As a follow-up on this, based on my comments to your emma platform
> code, I think it would be easy enough to just use the appended
> dtb support that we have, which allows you to boot a DT-enabled
> kernel with a legacy boot loader.

Thanks for your comments! I have some code going with DT now. Will
post tomorrow.

As for the appended dtb support, do you know the recommended way to
include it in the uImage? It feels a bit odd to recommend customers to
patch their kernel source to build a bootable kernel.  I ended up with
this local hackery, but there must be better ways:

--- 0001/arch/arm/boot/Makefile
+++ work/arch/arm/boot/Makefile 2012-05-09 00:40:17.000000000 +0900
@@ -53,6 +53,7 @@ $(obj)/compressed/vmlinux: $(obj)/Image

 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
        $(call if_changed,objcopy)
+       cat $(obj)/emev2-kzm9d.dtb >> $@
        @echo '  Kernel: $@ is ready'

 endif

Cheers,

/ magnus
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