From: Albert Herranz <albert_herranz@yahoo•es>
Cc: linuxppc-dev@lists•ozlabs.org
Subject: Re: [RFC PATCH v2 08/11] powerpc: gamecube/wii: early debugging using usbgecko
Date: Mon, 30 Nov 2009 07:15:42 +0100 [thread overview]
Message-ID: <4B13630E.1050405@yahoo.es> (raw)
In-Reply-To: <4B135D3D.9030006@yahoo.es>
Albert Herranz wrote:
> Benjamin Herrenschmidt wrote:
>> On Sat, 2009-11-28 at 21:43 +0100, Albert Herranz wrote:
>>> + * Prepare again the same BAT for MMU_init.
>>> + * This allows udbg I/O to continue working after the MMU is
>>> + * turned on for real.
>>> + *
>>> + * We are assuming here that exi_io_base is identity mapped.
>>> + */
>>> + addr = ((unsigned long)exi_io_base) & 0xffff0000;
>>> + setbat(1, addr, addr, 128*1024, PAGE_KERNEL_NCG);
>> How do you prevent that from overlapping otherwise valid kernel
>> mappings ?
>>
>
> ug_udbg_init() is called from ppc_md.init_early.
^^^
This got here, but although it's true it doesn't apply here :)
> It doesn't overlap any valid kernel mappings because exi_io_base is hardcoded to an i/o region not used yet by the kernel.
> See udbg_early_grab_exi_io_base().
> The setbat just prepares again, exactly in the same way, the same BAT that we got setup by setup_usbgecko_bat in head_32.S.
>
Thanks,
Albert
next prev parent reply other threads:[~2009-11-30 6:15 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-28 20:43 [RFC PATCH v2 00/11] powerpc: nintendo gamecube support Albert Herranz
2009-11-28 20:43 ` [RFC PATCH v2 01/11] powerpc: gamecube/wii: usbgecko bootwrapper console support Albert Herranz
2009-12-01 18:28 ` Segher Boessenkool
2009-11-28 20:43 ` [RFC PATCH v2 02/11] powerpc: gamecube: device tree Albert Herranz
2009-12-01 18:29 ` Segher Boessenkool
2009-11-28 20:43 ` [RFC PATCH v2 03/11] powerpc: gamecube: bootwrapper bits Albert Herranz
2009-12-01 18:31 ` Segher Boessenkool
2009-11-28 20:43 ` [RFC PATCH v2 04/11] powerpc: gamecube/wii: introduce GAMECUBE_COMMON Albert Herranz
2009-11-28 20:43 ` [RFC PATCH v2 05/11] powerpc: gamecube/wii: declare as non-coherent platforms Albert Herranz
2009-11-28 20:43 ` [RFC PATCH v2 06/11] powerpc: gamecube/wii: do not include PCI support Albert Herranz
2009-11-28 20:43 ` [RFC PATCH v2 07/11] powerpc: gamecube/wii: udbg support for usbgecko Albert Herranz
2009-12-01 18:33 ` Segher Boessenkool
2009-11-28 20:43 ` [RFC PATCH v2 08/11] powerpc: gamecube/wii: early debugging using usbgecko Albert Herranz
2009-11-29 23:18 ` Benjamin Herrenschmidt
2009-11-30 5:50 ` Albert Herranz
2009-11-30 6:14 ` Benjamin Herrenschmidt
2009-11-30 6:28 ` Albert Herranz
2009-11-30 6:42 ` Benjamin Herrenschmidt
2009-11-30 6:15 ` Albert Herranz [this message]
2009-11-28 20:43 ` [RFC PATCH v2 09/11] powerpc: gamecube/wii: flipper interrupt controller support Albert Herranz
2009-11-29 23:21 ` Benjamin Herrenschmidt
2009-12-01 18:35 ` Segher Boessenkool
2009-12-01 19:48 ` Albert Herranz
2009-12-02 20:56 ` Benjamin Herrenschmidt
2009-12-02 23:29 ` Albert Herranz
2009-11-28 20:43 ` [RFC PATCH v2 10/11] powerpc: gamecube: platform support Albert Herranz
2009-11-28 20:43 ` [RFC PATCH v2 11/11] powerpc: gamecube: default config Albert Herranz
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