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I am currently implementing a CAN Bootloader, I am using the Bootloader saved in the file store of this group and the Bootloader documented in AN1828/D as reference. I have a question regarding running the Bootloader from RAM, we currently use the serial Bootloader from the freescale site, this copies itself into RAM and moves RAM to the upper 4k of flash to overlay the Bootloader allowing all other flash locations to be programmed. I cannot see in either of the CAN Bootloaders RAM being moved to the upper 4k of flash. Does anyone know if I am missing something here, should the RAM be moved as with the serial version as I believe it should be? Thanks in advance Graham ********************************************************************** This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. Although BERU F1 SYSTEMS believe this e-mail and any attachments are free of any virus or other defect which may affect a computer, it is the responsibility of the recipient to ensure that it is virus free and BERU F1 SYSTEMS do not accept any responsibility for any loss or damage arising in any way from its use. This footnote confirms that this email message has been swept by MAILSweeper. ********************************************************************** |
CAN Bootloader
Started by ●February 15, 2005
Reply by ●February 15, 20052005-02-15
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Which mcu are we talking about? I don't know of any where the RAM would be overlaping the Flash. In fact, I thought moving RAM to upper 4K would in fact cover part of Flash. Or what upper 4K are we talking about? --- In , Graham Tricker <Graham.Tricker@F...> wrote: > I am currently implementing a CAN Bootloader, I am using the Bootloader > saved in the file store of this group and the Bootloader documented in > AN1828/D as reference. > I have a question regarding running the Bootloader from RAM, we currently > use the serial Bootloader from the freescale site, this copies itself into > RAM and moves RAM to the upper 4k of flash to overlay the Bootloader > allowing all other flash locations to be programmed. I cannot see in either > of the CAN Bootloaders RAM being moved to the upper 4k of flash. > > Does anyone know if I am missing something here, should the RAM be moved as > with the serial version as I believe it should be? > > Thanks in advance > > Graham |
Reply by ●February 16, 20052005-02-16
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Graham, The main reason to copy and execute from RAM is to allow to erase/reprogram the flash page where bootloader is stored, excepting the bootloader itself. Jordi Costa ----- Original Message ----- From: "Graham Tricker" <> To: <> Sent: Tuesday, February 15, 2005 6:29 PM Subject: [68HC12] CAN Bootloader > > I am currently implementing a CAN Bootloader, I am using the Bootloader > saved in the file store of this group and the Bootloader documented in > AN1828/D as reference. > I have a question regarding running the Bootloader from RAM, we currently > use the serial Bootloader from the freescale site, this copies itself into > RAM and moves RAM to the upper 4k of flash to overlay the Bootloader > allowing all other flash locations to be programmed. I cannot see in either > of the CAN Bootloaders RAM being moved to the upper 4k of flash. > > Does anyone know if I am missing something here, should the RAM be moved as > with the serial version as I believe it should be? > > Thanks in advance > > Graham > |
Reply by ●February 16, 20052005-02-16
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Hi Jordi, Yes I understand this, the problem I have is that the serial Bootloader I use at the minute writes to the INITRM register to move the RAM to the top 16k address location, so the rest of the flash can be programmed except the Bootloader. The two CAN Bootloaders I am using as reference get copied into RAM via a LRAE but do not appear to write to this register thus leaving the RAM in its default location, I am trying to ascertain if there is a reason for the RAM being left in its default location. Graham -----Original Message----- From: Jordi Costa [mailto:] Sent: 16 February 2005 08:14 To: Subject: Re: [68HC12] CAN Bootloader Graham, The main reason to copy and execute from RAM is to allow to erase/reprogram the flash page where bootloader is stored, excepting the bootloader itself. Jordi Costa ----- Original Message ----- From: "Graham Tricker" <> To: <> Sent: Tuesday, February 15, 2005 6:29 PM Subject: [68HC12] CAN Bootloader > > I am currently implementing a CAN Bootloader, I am using the Bootloader > saved in the file store of this group and the Bootloader documented in > AN1828/D as reference. > I have a question regarding running the Bootloader from RAM, we currently > use the serial Bootloader from the freescale site, this copies itself into > RAM and moves RAM to the upper 4k of flash to overlay the Bootloader > allowing all other flash locations to be programmed. I cannot see in either > of the CAN Bootloaders RAM being moved to the upper 4k of flash. > > Does anyone know if I am missing something here, should the RAM be moved as > with the serial version as I believe it should be? > > Thanks in advance > > Graham > <http://us.ard.yahoo.com/SIG9nov242/M)8184.6018725.7038619.3001176/D=gr oups/S06554205:HM/EXP08627889/A%32114/R=2/SIGko0j2b6/*http://clk. atdmt.com/NFX/go/yhxxxnfx0020000014nfx/direct/01/&time08541489367695 <http://us.adserver.yahoo.com/l?M)8184.6018725.7038619.3001176/D=groups/S= :HM/A%32114/rand@6768377> _____ > Service. |
Reply by ●February 16, 20052005-02-16
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Graham, The main reason to move the RAM to the top of the memory, is if you want to process interrupts while executing the Flash programming algorithms from the internal RAM (since the high Flash page is available to supply the interrupt vector when this Flash block is being updated). If you are sure there will be no interrupt requests, moving the RAM is not necessary - you can execute from the RAM in its default Reset location. Hope this helps, Doron Nohau Corporation HC12 In-Circuit Emulators www.nohau.com/emul12pc.html At 08:53 16/02/2005 +0000, you wrote: >Hi Jordi, > >Yes I understand this, the problem I have is that the serial Bootloader I >use at the minute writes to the INITRM register to move the RAM to the top >16k address location, so the rest of the flash can be programmed except the >Bootloader. The two CAN Bootloaders I am using as reference get copied into >RAM via a LRAE but do not appear to write to this register thus leaving the >RAM in its default location, I am trying to ascertain if there is a reason >for the RAM being left in its default location. > >Graham > >-----Original Message----- >From: Jordi Costa [mailto:] >Sent: 16 February 2005 08:14 >To: >Subject: Re: [68HC12] CAN Bootloader > >Graham, > >The main reason to copy and execute from RAM is to allow to erase/reprogram >the flash page where bootloader is stored, excepting the bootloader itself. > >Jordi Costa > >----- Original Message ----- >From: "Graham Tricker" <> >To: <> >Sent: Tuesday, February 15, 2005 6:29 PM >Subject: [68HC12] CAN Bootloader > > > > I am currently implementing a CAN Bootloader, I am using the Bootloader > > saved in the file store of this group and the Bootloader documented in > > AN1828/D as reference. > > I have a question regarding running the Bootloader from RAM, we currently > > use the serial Bootloader from the freescale site, this copies itself into > > RAM and moves RAM to the upper 4k of flash to overlay the Bootloader > > allowing all other flash locations to be programmed. I cannot see in >either > > of the CAN Bootloaders RAM being moved to the upper 4k of flash. > > > > Does anyone know if I am missing something here, should the RAM be moved >as > > with the serial version as I believe it should be? > > > > Thanks in advance > > > > Graham > > > ><http://us.ard.yahoo.com/SIG9nov242/M)8184.6018725.7038619.3001176/D=gr >oups/S06554205:HM/EXP08627889/A%32114/R=2/SIGko0j2b6/*http://clk. >atdmt.com/NFX/go/yhxxxnfx0020000014nfx/direct/01/&time08541489367695 ><http://us.adserver.yahoo.com/l?M)8184.6018725.7038619.3001176/D=groups/S= >:HM/A%32114/rand@6768377> > > _____ > >> Service. > > >Yahoo! Groups Links > > |
Reply by ●February 16, 20052005-02-16
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It would paint a better picture if you could say - Which MCU (MC68HC912BC32 ?) - What value of INITRM is being written (0xf8 ?) --- In , Graham Tricker <Graham.Tricker@F...> wrote: > Hi Jordi, > > Yes I understand this, the problem I have is that the serial Bootloader I > use at the minute writes to the INITRM register to move the RAM to the top > 16k address location, so the rest of the flash can be programmed except the > Bootloader. The two CAN Bootloaders I am using as reference get copied into > RAM via a LRAE but do not appear to write to this register thus leaving the > RAM in its default location, I am trying to ascertain if there is a reason > for the RAM being left in its default location. > > Graham > > -----Original Message----- > From: Jordi Costa [mailto:bvjordi@b...] > Sent: 16 February 2005 08:14 > To: > Subject: Re: [68HC12] CAN Bootloader > > Graham, > > The main reason to copy and execute from RAM is to allow to erase/reprogram > the flash page where bootloader is stored, excepting the bootloader itself. > > Jordi Costa > > ----- Original Message ----- > From: "Graham Tricker" <Graham.Tricker@F...> > To: <> > Sent: Tuesday, February 15, 2005 6:29 PM > Subject: [68HC12] CAN Bootloader > > > > I am currently implementing a CAN Bootloader, I am using the Bootloader > > saved in the file store of this group and the Bootloader documented in > > AN1828/D as reference. > > I have a question regarding running the Bootloader from RAM, we currently > > use the serial Bootloader from the freescale site, this copies itself into > > RAM and moves RAM to the upper 4k of flash to overlay the Bootloader > > allowing all other flash locations to be programmed. I cannot see in > either > > of the CAN Bootloaders RAM being moved to the upper 4k of flash. > > > > Does anyone know if I am missing something here, should the RAM be moved > as > > with the serial version as I believe it should be? > > > > Thanks in advance > > > > Graham > <http://us.ard.yahoo.com/SIG9nov242/M)8184.6018725.7038619.3001176/D=gr > oups/S06554205:HM/EXP08627889/A%32114/R=2/SIGko0j2b6/*http://clk. > atdmt.com/NFX/go/yhxxxnfx0020000014nfx/direct/01/&time08541489367695> <http://us.adserver.yahoo.com/l?M)8184.6018725.7038619.3001176/D=groups/S= > :HM/A%32114/rand@6768377> > > _____ > > > Service. > |
Reply by ●February 16, 20052005-02-16
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I think Doron has answered my question in his mail earlier, the CAN bootloaders I am using as reference do not use interrupts and hence do not need RAM to be moved. It will be a few days before I can test this as I have just got the LRAE compiled and running within our environment and have to write the PC app to load the Bootloader and get this running before I even think about flashing the processor. Just trying to pre-empt any pitfalls in advance. Just to clarify our MCU is the MC9S12DP256 and my existing serial Bootloader writes 0xC1 to the INITRM register. Cheers Graham -----Original Message----- From: Jefferson Smith [mailto:] Sent: 16 February 2005 16:02 To: Subject: [68HC12] Re: CAN Bootloader It would paint a better picture if you could say - Which MCU (MC68HC912BC32 ?) - What value of INITRM is being written (0xf8 ?) --- In , Graham Tricker <Graham.Tricker@F...> wrote: > Hi Jordi, > > Yes I understand this, the problem I have is that the serial Bootloader I > use at the minute writes to the INITRM register to move the RAM to the top > 16k address location, so the rest of the flash can be programmed except the > Bootloader. The two CAN Bootloaders I am using as reference get copied into > RAM via a LRAE but do not appear to write to this register thus leaving the > RAM in its default location, I am trying to ascertain if there is a reason > for the RAM being left in its default location. > > Graham > > -----Original Message----- > From: Jordi Costa [mailto:bvjordi@b...] > Sent: 16 February 2005 08:14 > To: > Subject: Re: [68HC12] CAN Bootloader > > Graham, > > The main reason to copy and execute from RAM is to allow to erase/reprogram > the flash page where bootloader is stored, excepting the bootloader itself. > > Jordi Costa > > ----- Original Message ----- > From: "Graham Tricker" <Graham.Tricker@F...> > To: <> > Sent: Tuesday, February 15, 2005 6:29 PM > Subject: [68HC12] CAN Bootloader > > > > I am currently implementing a CAN Bootloader, I am using the Bootloader > > saved in the file store of this group and the Bootloader documented in > > AN1828/D as reference. > > I have a question regarding running the Bootloader from RAM, we currently > > use the serial Bootloader from the freescale site, this copies itself into > > RAM and moves RAM to the upper 4k of flash to overlay the Bootloader > > allowing all other flash locations to be programmed. I cannot see in > either > > of the CAN Bootloaders RAM being moved to the upper 4k of flash. > > > > Does anyone know if I am missing something here, should the RAM be moved > as > > with the serial version as I believe it should be? > > > > Thanks in advance > > > > Graham > < http://us.ard.yahoo.com/SIG9nov242/M)8184.6018725.7038619.3001176/D=gr <http://us.ard.yahoo.com/SIG9nov242/M)8184.6018725.7038619.3001176/D=gr > > oups/S06554205:HM/EXP08627889/A%32114/R=2/SIGko0j2b6/* http://clk. <http://clk.> > atdmt.com/NFX/go/yhxxxnfx0020000014nfx/direct/01/&time08541489367695> < http://us.adserver.yahoo.com/l?M)8184.6018725.7038619.3001176/D=groups/S= <http://us.adserver.yahoo.com/l?M)8184.6018725.7038619.3001176/D=groups/S= > > :HM/A%32114/rand@6768377> > > _____ > > <http://docs.yahoo.com/info/terms/> > Service. <http://us.ard.yahoo.com/SIG997kohg/M)8184.6018725.7038619.3001176/D=gr oups/S06554205:HM/EXP08656142/A%32114/R=2/SIGkc51rq0/*http://clk. atdmt.com/NFX/go/yhxxxnfx0020000014nfx/direct/01/&time08569742201664 <http://us.adserver.yahoo.com/l?M)8184.6018725.7038619.3001176/D=groups/S= :HM/A%32114/rand2706984> _____ > Service. |
Reply by ●February 23, 20052005-02-23
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Does the serial bootloader you got from freescale actually work? The one I have is in assembly and it is from freescale. I have found several errors just by looking at the code. Did you have to rewrite the code to get it to work and if you did may I have a copy of the rewritten code. If not may I have your number to get a few pointers? Bob Elliott --- In , Graham Tricker <Graham.Tricker@F...> wrote: > I am currently implementing a CAN Bootloader, I am using the Bootloader > saved in the file store of this group and the Bootloader documented in > AN1828/D as reference. > I have a question regarding running the Bootloader from RAM, we currently > use the serial Bootloader from the freescale site, this copies itself into > RAM and moves RAM to the upper 4k of flash to overlay the Bootloader > allowing all other flash locations to be programmed. I cannot see in either > of the CAN Bootloaders RAM being moved to the upper 4k of flash. > > Does anyone know if I am missing something here, should the RAM be moved as > with the serial version as I believe it should be? > > Thanks in advance > > Graham > > ********************************************************************* * > This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e- mail by mistake and delete this e-mail from your system. > Although BERU F1 SYSTEMS believe this e-mail and any attachments are free of any virus or other defect which may affect a computer, it is the responsibility of the recipient to ensure that it is virus free and BERU F1 SYSTEMS do not accept any responsibility for any loss or damage arising in any way from its use. > This footnote confirms that this email message has been swept by MAILSweeper. > ********************************************************************* * > |
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Reply by ●February 23, 20052005-02-23
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I'm investigating a CAN bootloader for my myself and I have a couple
of general uninformed questions: Is this loader conformant with any of the higher level CAN implementations like canopen, etc? I had a cursory look under the hood and see two builds - one for the flash the other for sram. Could not a single bootload sector have been feasible using a stack copy scheme for the flash programming func? What server side issues do I need to consider? |
Reply by ●February 23, 20052005-02-23
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The Bootloader I have is also assembler, I compiled the Bootloader using Cosmic Idea, and don't recall having any major problems especially considering my assembler is quite limited. I found one bug which I believe I documented on this group a while ago, I had a product with a keypad connected to port A and moving the keypad caused the Bootloader to fail. I tracked it down to the line. cmpb SRecLow,pcr this was comparing b against the value at address $00 which happens to be port A input register, I changed to the following and all seems ok now cmpb #SRecLow>>16 We have been running this Bootloader in several products for the past couple of years and has been running fine, bar the occasional unexplained failure to bootload in the field. Hope this helps, I would be interested to hear if you have found any other bugs which may manifest themselves in the future though. Graham -----Original Message----- From: robertodellelliott [mailto:] Sent: 23 February 2005 13:34 To: Subject: [68HC12] Re: CAN Bootloader Does the serial bootloader you got from freescale actually work? The one I have is in assembly and it is from freescale. I have found several errors just by looking at the code. Did you have to rewrite the code to get it to work and if you did may I have a copy of the rewritten code. If not may I have your number to get a few pointers? Bob Elliott --- In , Graham Tricker <Graham.Tricker@F...> wrote: > I am currently implementing a CAN Bootloader, I am using the Bootloader > saved in the file store of this group and the Bootloader documented in > AN1828/D as reference. > I have a question regarding running the Bootloader from RAM, we currently > use the serial Bootloader from the freescale site, this copies itself into > RAM and moves RAM to the upper 4k of flash to overlay the Bootloader > allowing all other flash locations to be programmed. I cannot see in either > of the CAN Bootloaders RAM being moved to the upper 4k of flash. > > Does anyone know if I am missing something here, should the RAM be moved as > with the serial version as I believe it should be? > > Thanks in advance > > Graham > > ********************************************************************* * > This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e- mail by mistake and delete this e-mail from your system. > Although BERU F1 SYSTEMS believe this e-mail and any attachments are free of any virus or other defect which may affect a computer, it is the responsibility of the recipient to ensure that it is virus free and BERU F1 SYSTEMS do not accept any responsibility for any loss or damage arising in any way from its use. > This footnote confirms that this email message has been swept by MAILSweeper. > ********************************************************************* * > _____ > Service. |
