From 64b505156e41a12063a50b5884449ab972d6c02d Mon Sep 17 00:00:00 2001 From: David Shah Date: Tue, 28 Apr 2020 15:14:27 +0100 Subject: [PATCH] Add RDIMM side-B inversion support Signed-off-by: David Shah --- litex/soc/software/bios/sdram.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/litex/soc/software/bios/sdram.c b/litex/soc/software/bios/sdram.c index 8d8ddfefe..94df63168 100644 --- a/litex/soc/software/bios/sdram.c +++ b/litex/soc/software/bios/sdram.c @@ -269,6 +269,13 @@ void sdrwlon(void) sdram_dfii_pi0_address_write(DDRX_MR1 | (1 << 7)); sdram_dfii_pi0_baddress_write(1); command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS); + +#ifdef SDRAM_PHY_DDR4_RDIMM + sdram_dfii_pi0_address_write((DDRX_MR1 | (1 << 7)) ^ 0x2BF8) ; + sdram_dfii_pi0_baddress_write(1 ^ 0xF); + command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS); +#endif + ddrphy_wlevel_en_write(1); } @@ -277,6 +284,13 @@ void sdrwloff(void) sdram_dfii_pi0_address_write(DDRX_MR1); sdram_dfii_pi0_baddress_write(1); command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS); + +#ifdef SDRAM_PHY_DDR4_RDIMM + sdram_dfii_pi0_address_write(DDRX_MR1 ^ 0x2BF8); + sdram_dfii_pi0_baddress_write(1 ^ 0xF); + command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS); +#endif + ddrphy_wlevel_en_write(0); } @@ -1158,6 +1172,12 @@ void sdrmrwr(char reg, int value) { sdram_dfii_pi0_address_write(value); sdram_dfii_pi0_baddress_write(reg); command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS); + +#ifdef SDRAM_PHY_DDR4_RDIMM + sdram_dfii_pi0_address_write(value ^ 0x2BF8); + sdram_dfii_pi0_baddress_write(reg ^ 0xF); + command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS); +#endif } static void sdrmpron(char mpr)