3 Commits (b0e15f2fb510427f4a3b652453ea2e82ae8aac02)

Author	SHA1	Message	Date
Benjamin Herrenschmidt	bf1b98b958	litedram: Add support for booting without BRAM ... This adds an option to disable the main BRAM and instead copy a payload stashed along with the init code in the secondary BRAM into DRAM and boot from there Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>	5 years ago
Benjamin Herrenschmidt	573b6b4bc4	soc: Rework interconnect ... This changes the SoC interconnect such that the main 64-bit wishbone out of the processor is first split between only 3 slaves (BRAM, DRAM and a general "IO" bus) instead of all the slaves in the SoC. The IO bus leg is then latched and down-converted to 32 bits data width, before going through a second address decoder for the various IO devices. This significantly reduces routing and timing pressure on the main bus, allowing to get rid of frequent timing violations when synthetizing on small'ish FPGAs such as the Artix-7 35T found on the original Arty board. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>	5 years ago
Benjamin Herrenschmidt	025cf5efe8	syscon: Add syscon registers ... These provides some info about the SoC (though it's still somewhat incomplete and needs more work, see comments). There's also a control register for selecting DRAM vs. BRAM at 0 (and for soft-resetting the SoC but that isn't wired up yet). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>	5 years ago