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Hi all! Can I download my program into the FLASH memory using the JTAG port? The CrossWorks utilize own loader from SRAM which program the FLASH segment using IAP. Thanks |
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Programming the flash memory through the JTAG port
Started by ●January 21, 2004
Reply by ●January 21, 20042004-01-21
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----- Original Message ----- From: "russian_beagle" <> To: <> Sent: Wednesday, January 21, 2004 8:30 PM Subject: [lpc2100] Programming the flash memory through the JTAG port > Hi all! > > Can I download my program into the FLASH memory using the JTAG > port? The CrossWorks utilize own loader from SRAM which program the > FLASH segment using IAP. If you have a Wiggler OCD Commander software from Macraigor can upload files via JTAG. Leon -- Leon Heller, G1HSM Email: My low-cost Philips LPC210x ARM development system: http://webspace.webring.com/people/jl/leon_heller//lpc2104.html |
Reply by ●January 21, 20042004-01-21
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Leon, > > Can I download my program into the FLASH memory using the > JTAG port? > > The CrossWorks utilize own loader from SRAM which program the FLASH > > segment using IAP. > > If you have a Wiggler OCD Commander software from Macraigor > can upload files via JTAG. Does load load the LPC FLASH then, Leon? -- Paul. |
Reply by ●January 21, 20042004-01-21
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----- Original Message ----- From: "Paul Curtis" <> To: <> Sent: Wednesday, January 21, 2004 9:21 PM Subject: RE: [lpc2100] Programming the flash memory through the JTAG port > Leon, > > > > Can I download my program into the FLASH memory using the > > JTAG port? > > > The CrossWorks utilize own loader from SRAM which program the FLASH > > > segment using IAP. > > > > If you have a Wiggler OCD Commander software from Macraigor > > can upload files via JTAG. > > Does load load the LPC FLASH then, Leon? I think what I said was wrong, it will only load into RAM. Leon -- Leon Heller, G1HSM Email: My low-cost Philips LPC210x ARM development system: http://webspace.webring.com/people/jl/leon_heller//lpc2104.html |
Reply by ●January 21, 20042004-01-21
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> -----Original Message----- > From: russian_beagle [mailto:] > Sent: 21 January 2004 20:30 > To: > Subject: [lpc2100] Programming the flash memory through the JTAG port > Hi all! > > Can I download my program into the FLASH memory using the JTAG > port? The CrossWorks utilize own loader from SRAM which program the > FLASH segment using IAP. I don't believe that Philips publish anything that tells you how to program the flash on the LPC, other than by using the bootstrap loader or by calling a set of routines in the rom yourself (which the BSL itself uses). As such, it is impossible to program the flash (read: nearly impossible) using pure JTAG. Certainly, I believe Philips can change the flash controller or technology without changing the programming interface, so even if you did reverse engineer the bootstrap loader to figure out how to poke the flash controller, it's not guaranteed that the flash controller remains static across revs of the silicon, but the API will. -- Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk CrossWorks for MSP430 and ARM processors |
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Reply by ●January 22, 20042004-01-22
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--- In , "Paul Curtis" <plc@r...> wrote: > > > -----Original Message----- > > From: russian_beagle [mailto:russian_beagle@y...] > > Sent: 21 January 2004 20:30 > > To: > > Subject: [lpc2100] Programming the flash memory through the JTAG port > > > > > > Hi all! > > > > Can I download my program into the FLASH memory using the JTAG > > port? The CrossWorks utilize own loader from SRAM which program the > > FLASH segment using IAP. > > I don't believe that Philips publish anything that tells you how to > program the flash on the LPC, other than by using the bootstrap loader > or by calling a set of routines in the rom yourself (which the BSL > itself uses). As such, it is impossible to program the flash (read: > nearly impossible) using pure JTAG. Certainly, I believe Philips can > change the flash controller or technology without changing the > programming interface, so even if you did reverse engineer the bootstrap > loader to figure out how to poke the flash controller, it's not > guaranteed that the flash controller remains static across revs of the > silicon, but the API will. > > -- > Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk > CrossWorks for MSP430 and ARM processors It is "by definition" possible to program the device through JTAG. However, Paul brought up the most important issue, compatibility over a longer periode of time. If Philips does not publish the direct programming sequence, they might have a good reason for it, one being that changes can be made to the actual programming mechanism without changing anything in the Programming Interface. I would HIGHLY recommend to use the internal routines provided by the bootloader for ease of use as much as for avoiding future trouble in case the mechanism actually changes. Being an embedded developer as well as involved with customer support some times, I know that we all want to know HOW things work in detail but sometimes it is time not well spent to dig into issues that can only make live harder. On a side note, I don't try to figure out the exact procedures used by the BIOS of my PC if I program something in Visual C++ :-) Cheers, Bob. |
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Reply by ●January 23, 20042004-01-23
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> It is "by definition" possible to program the device through
JTAG. > However, Paul brought up the most important issue, compatibility over > a longer periode of time. If Philips does not publish the direct > programming sequence, they might have a good reason for it, one being > that changes can be made to the actual programming mechanism without > changing anything in the Programming Interface. > > I would HIGHLY recommend to use the internal routines provided by the > bootloader for ease of use as much as for avoiding future trouble in > case the mechanism actually changes. > > Being an embedded developer as well as involved with customer support > some times, I know that we all want to know HOW things work in detail > but sometimes it is time not well spent to dig into issues that can > only make live harder. > > On a side note, I don't try to figure out the exact procedures used by > the BIOS of my PC if I program something in Visual C++ :-) > > Cheers, Bob. You right. But by chance I can erase the bootloader. I found in our russian forum what one embedder erased the bootloader when he downloaded a big file ( > 128 kB) to LPC21xx through the flash bootloader. I don't know is it possible? But theoretically it is possible :( When I will have free time, I will disassemble the Philips bootloader. Maybe I will find a technique of working with flash memory without IAP. BR, Konstantin. |
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