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George, I did read the SPRA618 a few times, but I missed the point concerning the reading of the address in 8 bits. But (and you mention it) the information was there... Thank you for your very clear, complete, and helpful answer. Raymond > ----- Original Message ----- > From: "George Crouse" <> > To: "Raymond Ranwez" <>; <> > Sent: Thursday, February 07, 2002 6:19 PM > Subject: Re: [c54x] Booting 5410 from Flash > > Raymond- > > > > The parallel boot mode uses a boot table mapped into ext data space, i.e. > 0x4000-FFFF. To > > get the address of the table it first reads I/O space at 0xFFFF, and if > unsuccessful, > > reads Data space at 0xFFFF and 0xFFFE. It's looking for an address which > contains the > > boot table "signature" 0x10AA or 0x08AA. Check out SPRA618 if you haven't > yet. > > > > So the answer is you have to have a boot vector at 0xFFFE-FFFF in Data or > I/O space which > > points to your boot table. Easiest thing with a single ROM/Flash is just > make sure it > > covers addresses 0xFFFE/FFFF. For example a 32K x 8 mapped at 0x8000-FFFF > could contain > > the boot vector, the boot table, and code to load at boot time. > > > > Of course TI with their infinite wisdom decides that boot vector and table > should reside > > in data space, while the loadable code is in program space! So either you > map the flash > > to both and cut into the space you'd like to put RAM, or you use a GPIO or > some other > > method to switch the _DS / _PS lines after boot. In other words: at boot > time, your flash > > exists in data and program space (so it can read the boot stuff and code) > leaving ext RAM > > unmapped; after boot you set the bit so the flash exists in program space > only and RAM is > > in data space. You pretty much get the impression TI never tried to use > parallel boot > > mode... > > > > Or you skip this nonsense, disable TI's ROM while mumbling a few > obscenities, then write > > your own loader like I did. > > > > -George > > > > > > > > ----- Original Message ----- > > From: Raymond Ranwez <> > > To: <>; George Crouse <> > > Sent: Thursday, February 07, 2002 9:31 AM > > Subject: Re: [c54x] Booting 5410 from Flash > > > > > > > Hi George, > > > > > > I have just one question: how do you give the hardware address of the > flash > > > memory do the DSP at boot (the flash address is the data that will be > read > > > by the DSP at address 0xFFFF). > > > Do you use special hardware for that (like driver chips)? > > > (I think that you don't need such special hardware if you use 16-bit > flash > > > memory, if the flash is also mapped in memory up to 0xFFFF. But you and > I > > > use 8-bit flash) > > > > > > Raymond Ranwez > > > > > > ----- Original Message ----- > > > From: "George Crouse" <> > > > To: <> > > > Sent: Tuesday, February 05, 2002 5:25 PM > > > Subject: Re: [c54x] Booting 5410 from Flash > > > > > > > > > > You need to tell it you want to use the bootloader by specifying > the -boot > > > option in your > > > > command file; either by itself (default) to load everything- or by > > > individually naming > > > > sections you want it to load. Here's one of mine from a 5402 project > > > using 8b wide > > > > parallel PROM; you can adjust for your memory or if there are CPU > > > differences. Remember > > > > to get the C code entry point! > > > > > > > > dsp3_run.out /* input COFF file */ > > > > -o DSP3.hex /* output file name */ > > > > -a /* ASCII hex format */ > > > > > > > > -boot /* bootload all sections */ > > > > -bootorg PARALLEL /* external mem on main bus */ > > > > > > > > -memwidth 8 /* 8bit wide memory, using */ > > > > -romwidth 8 /* single byte-wide EPROM */ > > > > > > > > -e 0x06C7 /* C code entry point, check .map > file > > > for address */ > > > > > > > > > > > > > > > > > > > > > From: "Santosh M Nadig" <> > > > > > Subject: Booting 5410 from flash > > > > > > > > > > Hello all, > > > > > > > > > > I have a problem with booting 5410 from Flash (two 8-bit flash. one > for > > > > > upper 8 bits and other for the lower 8 bits). The bootloader > document > > > says > > > > > that the bootloader reads 0FFFF location of I/O or Data memory to > find a > > > > > valid keyword (10AA or 08AA). But, When I use the hex-conversion > utility > > > > > (hex500) how do I specify that?? If anyone has a sample command file > for > > > > > hex500 please send it to me. > > > > > > > > > > Thanks > > > > > Santosh > > > > > > > > > > > > > > > > _____________________________________ > > > > Note: If you do a simple "reply" with your email client, only the > author > > > of this message will receive your answer. You need to do a "reply all" > if > > > you want your answer to be distributed to the entire group. > > > > > > > > _____________________________________ > > > > About this discussion group: > > > > > > > > To Join: Send an email to > > > > > > > > To Post: Send an email to > > > > > > > > To Leave: Send an email to > > > > > > > > Archives: http://www.yahoogroups.com/group/c54x > > > > > > > > Other Groups: http://www.dsprelated.com > > > > > > > > > > > > ">http://docs.yahoo.com/info/terms/ > > > > > > > > > > > > > > > > > > > > |
Fw: Booting 5410 from Flash
Started by ●February 8, 2002
