Date: Mon, 09 May 2011 17:21:13 -0600 From: Peter Grehan <grehan@freebsd.org> To: Julian Elischer <julian@freebsd.org>, current@freebsd.org Subject: Re: firewire debugging Message-ID: <4DC876E9.5020705@freebsd.org>
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Hi Julian, > does anyone know if there is a limitation on firewire debugging on a > machine with > 4GB or memory? I don't know of any Firewire cards that support physical access *above* 4GB. They may exist. For instance, the (last?) Texas Instruments PCIe 1394a/b chip, the XIO2213B, has the following text in it's data sheet - >The physical upper bound register is an optional register and is >not implemented. .. and this is the firewire OHCI register that contains the upper 16 bits of the architected 48-bit physical address. So, you can probably use it for some form of amd64 kernel debug since kernel txt/data/bss is < 4G, but accessing anything above 4G won't work. later, Peter.
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