On Mon, Jul 27, 2009 at 8:36 PM, Tim Braun <[email protected]>wrote:
> Chetan Nanda wrote: > > We have a MIPS-4KEC based SoC and running an older version of U-Boot > > (1.1.3) on it. It is working perfectly fine. > > Board has 8MB AMD flash and starting address of that flash is > > 0xBFC00000 (reset vector for MIPS). > > > > Problem is that we are not able to access full 8MB of flash. Only > > 0xBFC00000 - 0xBFFFFFFF (4MB) is accessible, as it lies in un-mapped, > > un-cached region of MIPS. > > From 0xC0000000 lies in mapped memory area of MIPS. > > > > Now my questions are, creating entry in TLBs is sufficient to access > > rest of 4MB of flash? > > We are running U-Boot on an Raza Micro / AMD / Alchemy Au1200 and part > of our board initialization code says : > > /* PCMCIA is on a 36 bit physical address. > We need to map it into a 32 bit addresses */ > > write_one_tlb(20, /* index */ > 0x01ffe000, /* Pagemask, 16 MB pages */ > CFG_PCMCIA_IO_BASE, /* Hi */ > 0x3C000017, /* Lo0 */ > 0x3C200017); /* Lo1 */ > > write_one_tlb(21, /* index */ > 0x01ffe000, /* Pagemask, 16 MB pages */ > CFG_PCMCIA_ATTR_BASE, /* Hi */ > 0x3D000017, /* Lo0 */ > 0x3D200017); /* Lo1 */ > > In our case this maps the PCMCIA interface to usable 32 bit addresses > just fine, so I'm confident your board > init code could map your flash to an aliased address that would allow > access to the whole 8 MB of flash. > Thanks for suggestions, I will try these and will back with my findings. > > > Tim Braun > Sr. Des. Eng. > Librestream > O: +1.204.487.0612 ext 203 > F: +1.204.487.0914 > http://www.librestream.com > > Now shipping... the Onsight 2000Ex mobile collaboration device, designed > for hazardous locations that require Class I, Div 2 approval - > http://www.librestream.com/news_release/2009-01-22.php > Thanks, Chetan Nanda
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