This insures the common exception handler will not be
re-entered. The handler does not support nested interrupts
and the interrupt stack pointer and context will be overwritten
resulting in hard to debug hardfaults.
If all the priorities are equal the NVIC prevents the
preemption. The startup code defaults all the priorities
to the same value 128.
This change safeguards in 2 ways 1) By disabling
CONFIG_ ARCH_IRQPRIO: up_prioritize_irq cannot be called.
This will insure that all HW interrupts are at the same
priority.
2) By disabling CONFIG_ARCH_HIPRI_INTERRUP, the common
exception will disable any interrupts during interrupt
processing.
The fix ix in nuttx. This is just the defconfig changes to use
it.
There were 2 problems. The first was that the interrupt did
test DINT and raise a completion events. But since DINT is
just an indication of DMA completion, TC is a valid way to
determine that the transfer is complete.
The second problem is that Software Reset For DAT Line
SDHC_SYSCTL[RSTD] clears the bits 24-0 in SDHC_PROTO
this looses the wide bus setting DTW
Flash programing on the K66 has to be units of 8 bytes. So we cache
the write of words until there are 2 written. Then the 2 words are
written to FLASH. This change ensure the bin file has an even
number of (4 byte) words by padding the last section in progflash
with 0xffffffff if needed.
David Sidrane