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Discussion Groups | 68HC12 | 68HC912 D60A Flash Boot Protect not working(?)
Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
68HC912 D60A Flash Boot Protect not working(?) - Andy Reynolds - Nov 27 14:58:00 2002
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Hi Folks, Anyone had any strange experiences with the D60A bootp flag. I have it set and I still see my top (8000-ffff) 32k block getting completely erased each time I erase that block - the top 8K should be safe. As far as I can see I am setting bootp in feemcr and feelck very early after reset to stop erase/prog of the boot block. If I print the F4/F5 contents they are both 0x01. Any ideas? Cheers Andy |
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Re: 68HC912 D60A Flash Boot Protect not working(?) - Edward Karpicz - Nov 28 0:50:00 2002
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> Hi Folks, > > Anyone had any strange experiences with the D60A bootp flag. > > I have it set and I still see my top (8000-ffff) 32k block getting > completely erased each time I erase that block - the top 8K should be > safe. > > As far as I can see I am setting bootp in feemcr and feelck very > early after reset to stop erase/prog of the boot block. > > If I print the F4/F5 contents they are both 0x01. No such experiences. D60A starts with bootp32(28) set and my bootloader writes only to FEE32LCK to lock bootp32. First thing I do for blank part is clearing of F5 because I can't erase and write to bootblock. > Any ideas? Does oscilator start perfectly? It could be a problem. Wire reset button and check bootp/erase with stable clock. Edward > Cheers > > Andy |
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Re: 68HC912 D60A Flash Boot Protect not working(?) - Oliver Betz - Nov 28 2:39:00 2002
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"Andy Reynolds" <> wrote: > Anyone had any strange experiences with the D60A bootp flag. Works as expected in my own bootloader. > I have it set and I still see my top (8000-ffff) 32k block getting > completely erased each time I erase that block - the top 8K should be If I don't touch it after reset, the boot block is protected. If I clear it afterwards, the boot block can be erased. > As far as I can see I am setting bootp in feemcr and feelck very FEEMCR has no "BOOTP" bit but a "LOCK" bit. > early after reset to stop erase/prog of the boot block. BOOTP should already be set out from reset. Oliver |
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Re: 68HC912 D60A Flash Boot Protect not working(?) - Andy Reynolds - Nov 28 5:20:00 2002
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Thanks for your help guys - I will strip out the software until I get it to work , cheers Andy --- In 68HC12@y..., "Oliver Betz" <list_ob@g...> wrote: > "Andy Reynolds" <eg@a...> wrote: > > > Anyone had any strange experiences with the D60A bootp flag. > > Works as expected in my own bootloader. > > > I have it set and I still see my top (8000-ffff) 32k block getting > > completely erased each time I erase that block - the top 8K should be > > If I don't touch it after reset, the boot block is protected. If I > clear it afterwards, the boot block can be erased. > > > As far as I can see I am setting bootp in feemcr and feelck very > > FEEMCR has no "BOOTP" bit but a "LOCK" bit. > > > early after reset to stop erase/prog of the boot block. > > BOOTP should already be set out from reset. > > Oliver |
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