Jerry Van Baren wrote:
Pull up RSTCONF -> Connect WireTAP with No-head config file -> Program the image on 0xff000000 -> Disconnect WireTAP -> Pull down RSTCONF -> Power-on -> No serial output -> Power-down -> Connect WireTAP with head config file -> Reprogram the same image at 0xff000000 -> Disconnect WireTAP -> Power-on -> Work!
[snip]
The reason your first approach didn't work is because the HRCW gets read from the _first_32_bytes_ of flash (four reads at offsets 0,
In my first programming, RSTCONF pull up, HRCW is the default vaule 0x00000000. It doesn't need to read it from FLASH at all.
8, 16, 24 with CS0 asserted). It isn't read from any true "address" - BR0/OR0 are configured by the HRCW and thus cannot be used for reading the HRCW.
Yeah, I do agree. In
When you programmed u-boot at 0xFFF00000, u-boot was programmed into the proper location but the HRCW
I didn't program u-boot on 0xFFF00000 in this case. 0xFF000000 instead.
This is another reason for doing "low-boot" rather than "high-boot": in "low-boot" mode, both u-boot and the HRCW get placed in the proper memory locations inherently.
Yeah, thanks to the perfect adjustment on 8260, all we can do is to program one image at the first sector of FLASH to finish HRCW and boot the target at the same time. Low boot is much better than high boot on this point.
Answering your second question, my experience is that RSTCONF is necessary and _barely_ sufficient
So you mean RSTCONF MUST pull up when programming a blank FLASH on a 8260 target with BDI?
to program the HRCW in the first 32 bytes of flash. I never try to do more than that.
So for every brand-new target, we need to pullup RSTCONF once for programming the HRCW. Right?
Could we program the low-boot image at this time once for all on BDI?
Once you have a valid HRCW programmed, deassert RSTCONF, cycle power (IMPORTANT since the HRCW is only read on a full reset) and proceed normally.
Uh, Does "proceed normally" here mean we can use BDI to program the low-boot image at the first sector of FLASH? If so, BDI also needs to reprogram the low-boot image at the first sector of FLASH.
Or "proceed normally" means the programmed target can boot directly with the image which was done by pull-up case?
Thanks a lot for your notes,
Sam
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