Date: Wed, 31 May 2006 23:37:52 +0200 From: Olivier Houchard <mlfbsd@ci0.org> To: "Max N. Boyarov" <m.boyarov@bsd.by> Cc: freebsd-arm@freebsd.org Subject: Re: i80321reg.h Message-ID: <20060531213752.GA98637@ci0.org> In-Reply-To: <7hd5du3xdu.fsf@bsd.by> References: <7hodxe4132.fsf@bsd.by> <20060531170631.GA96970@ci0.org> <7hk6823yzj.fsf@bsd.by> <20060531175025.GA97299@ci0.org> <7hd5du3xdu.fsf@bsd.by>
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On Wed, May 31, 2006 at 08:41:17PM +0300, Max N. Boyarov wrote: > > >>>>> "OH" == Olivier Houchard writes: > > OH> On Wed, May 31, 2006 at 08:06:40PM +0300, Max N. Boyarov wrote: > >> > >> >>>>> "OH" == Olivier Houchard writes: > >> > >> OH> On Wed, May 31, 2006 at 07:21:21PM +0300, Max N. Boyarov wrote: > >> >> > >> >> Hi! > >> >> > >> >> What document should I read in order to understand > >> >> how to calculate the defines that are used in i80321reg.h ? > >> >> > >> > >> OH> Hi Max, > >> Hi Olivier, > >> OH> I'm not sure I understand the question. However, those most of those values > >> OH> come from the Intel 80321 I/O Processor developer's manual, available here : > >> OH> http://www.intel.com/design/iio/manuals/273517.htm > >> > >> Sorry for my english :). I meant, I do not know how freebsd works with virtual > >> memory, i.e. what address range is used for user applications, where kernel resides. > >> What would you recommend to read about that? Just for education purposes :) My concern > >> is 80321 xcale port only (not generic). > >> > > OH> No worries, my english isn't better :) > OH> Unfortunately I'm not sure there's something explaining this beside the code > OH> itself, so I'm gonna try to answer. > OH> Most of this is the same for every arm port, including the 80321. > OH> The interesting #define are mostly in sys/arm/include/vmparam.h > OH> * The line between user space and kernel space > OH> * Mappings >= KERNEL_BASE are constant across all processes > OH> */ > OH> #define KERNBASE 0xc0000000 > > OH> So generally speaking, whatever is >= 0xc0000000 is kernelland, whatever is < > OH> is userland. > OH> In arm/xscale/iq31244_machdep.c (which should be usable for every i80321 > OH> port, and thus has an unaccurate name), we map 0xfe800000 (IQ80321_OBIO_BASE), > OH> physical == virtual, to be able to use the UART early, > OH> then we use the virtual address 0xfe400000 (IQ80321_IOW_VBASE) to map the ATU > OH> stuff and the CPU registers. > > OH> I'm still not sure I properly answer to your question:) Feel free to ask > OH> for more. > > Many thanks, I shall continue to experiments with i80219 :) > I'm very interested in i80219 support but have no hardware, please make me know how it goes, I'd be more than happy to provide help. Cheers, Olivier
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