On Fri, Jan 23, 2026 at 10:18:04PM +0800, Gary Lau wrote: > Hi Stafford, > > I should clarify my setup: I'm using hardware address translation to make the > OpenCores 8-bit GPIO appear as 32-bit to the CPU. Specifically: > > 1. Address translation: The CPU's 32-bit addresses are right-shifted by 2 bits > (adr_i[2] in Verilog), so each 32-bit CPU access maps to the correct 8-bit > OpenCores register. > > 2. Data width adaptation: Only dat_i[7:0] and dat_o[7:0] are connected, so > 32-bit writes are truncated to 8-bit, and reads are zero-extended. > > This hardware wrapper makes brcm,bcm6345-gpio driver "work" with my OpenCores > GPIO, but it's really a hardware-level compatibility layer, not true software > compatibility. > > So you're absolutely right that the native opencores,gpio isn't compatible > with brcm,bcm6345-gpio. My setup works because of custom hardware translation, > not because the IP cores are compatible.
Thanks Gary for testing. -Stafford
