On Tue, Jan 13, 2015 at 06:40:40PM +0000, Barry Klein wrote: > I am a bit confused though about the memory management. > There is a Flash, NV SRAM, and two "high speed" SRAM chips. > Would an issue with the NV SRAM chip be responsible for a hang on the write to flash? Yes, if they share a common SPI bus (or parts of it). -- Gordonjcp MM0YEQ