[PATCH v2 2/3] bsh: imx6ulz_smm_m2: Update imx6ulz BSH SMM M2B board

Andrea Calabrese
2025-10-30T13:01:33Z

Improve support for the BSH SystemMaster (SMM) M2B board.
In particular, this patch adds the timing for the 512 MB version, and
the spi.c reflects it by removing the safe guards.

Signed-off-by: Andrea Calabrese <andrea.calabrese@amarulasolutions.com>

diff --git a/board/bsh/imx6ulz_smm_m2/Makefile b/board/bsh/imx6ulz_smm_m2/Makefile
index 233bbff4c16..5ab00a5ea75 100644
--- a/board/bsh/imx6ulz_smm_m2/Makefile
+++ b/board/bsh/imx6ulz_smm_m2/Makefile
@@ -4,4 +4,4 @@
obj-y := imx6ulz_smm_m2.o
obj-$(CONFIG_XPL_BUILD) += spl.o
obj-$(CONFIG_BSH_M2_MEMORY) += ddr3l_timing_512m.o ddr3l_timing_256m.o ddr3l_timing_128m.o
-obj-$(CONFIG_BSH_M2B_MEMORY) += ddr3l_timing_256m_m2b.o ddr3l_timing_128m_m2b.o
+obj-$(CONFIG_BSH_M2B_MEMORY) += ddr3l_timing_512m_m2b.o ddr3l_timing_256m_m2b.o ddr3l_timing_128m_m2b.o
diff --git a/board/bsh/imx6ulz_smm_m2/ddr3l_timing_512m_m2b.c b/board/bsh/imx6ulz_smm_m2/ddr3l_timing_512m_m2b.c
new file mode 100644
index 00000000000..04d39a9bdd6
--- /dev/null
+++ b/board/bsh/imx6ulz_smm_m2/ddr3l_timing_512m_m2b.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "spl_mtypes.h"
+
+static const struct dram_cfg_param ddr_ddrc_cfg_512mb[] = {
+ /* ============================================================================= */
+ /* IOMUX */
+ /* ============================================================================= */
+ /* DDR IO TYPE: */
+ {0x020E04B4, 0x000C0000}, /* IOMUXC_SW_PAD_CTL_GRP_DDR_TYPE */
+ {0x020E04AC, 0x00000000}, /* IOMUXC_SW_PAD_CTL_GRP_DDRPKE */
+
+ /* CLOCK: */
+ {0x020E027C, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_SDCLK0_P */
+
+ /* Control: */
+ {0x020E0250, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_CAS */
+ {0x020E024C, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_RAS */
+ {0x020E0490, 0x00000030}, /* IOMUXC_SW_PAD_CTL_GRP_ADDDS */
+ {0x020E0288, 0x000C0030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_RESET */
+ {0x020E0270, 0x00000000}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_SDBA2 */
+ /* DSE can be configured using Group Control Register: */
+ /* IOMUXC_SW_PAD_CTL_GRP_CTLDS */
+ {0x020E0260, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_ODT0 */
+ {0x020E0264, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_ODT1 */
+ {0x020E04A0, 0x00000030}, /* IOMUXC_SW_PAD_CTL_GRP_CTLDS */
+
+ /* Data Strobes: */
+ {0x020E0494, 0x00020000}, /* IOMUXC_SW_PAD_CTL_GRP_DDRMODE_CTL */
+ {0x020E0280, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_SDQS0_P */
+ {0x020E0284, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_SDQS1_P */
+
+ /* Data: */
+ {0x020E04B0, 0x00020000}, /* IOMUXC_SW_PAD_CTL_GRP_DDRMODE */
+ {0x020E0498, 0x00000030}, /* IOMUXC_SW_PAD_CTL_GRP_B0DS */
+ {0x020E04A4, 0x00000030}, /* IOMUXC_SW_PAD_CTL_GRP_B1DS */
+ {0x020E0244, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_DQM0 */
+ {0x020E0248, 0x00000030}, /* IOMUXC_SW_PAD_CTL_PAD_DRAM_DQM1 */
+
+ /* ============================================================================= */
+ /* DDR Controller Registers */
+ /* ============================================================================= */
+ /* Manufacturer 1:NANYA */
+ /* Device Part Number 1:NT5CC256M16ER-EKI */
+ /* Manufacturer 2:MICRON */
+ /* Device Part Number 2:MT41K256M16TW-107 */
+ /* Clock Freq.: 400MHz */
+ /* Density per CS in Gb: 4 */
+ /* Chip Selects used:1 */
+ /* Total DRAM density (Gb)4 */
+ /* Number of Banks:8 */
+ /* Row address: 15 */
+ /* Column address: 10 */
+ /* Data bus width16 */
+ /* ============================================================================= */
+ {0x021B001C, 0x00008000}, /* [MMDC_MDSCR] MMDC Core Special Command Register */
+
+ /* ====================================================== */
+ /* Calibrations: */
+ /* ====================================================== */
+ {0x021B0800, 0xA1390003}, /* DDR_PHY_P0_MPZQHWCTRL, */
+ /* enable both one-time & periodic HW ZQ calibration. */
+
+ {0x021B080C, 0x00060002},
+ /* [MMDC_MPWLDECTRL0] MMDC PHY Write Leveling Delay Control Register 0 */
+ {0x021B083C, 0x41500158},
+ /* [MMDC_MPDGCTRL0] MMDC PHY Read DQS Gating Control Register 0 */
+ {0x021B0848, 0x40403A3E},
+ /* [MMDC_MPRDDLCTL] MMDC PHY Read delay-lines Configuration Register */
+ {0x021B0850, 0x40402E28},
+ /* [MMDC_MPWRDLCTL] MMDC PHY Write delay-lines Configuration Register */
+
+ {0x021B081C, 0x33333333}, /* [MMDC_MPRDDQBY0DL] MMDC PHY Read DQ Byte0 Delay Register */
+ {0x021B0820, 0x33333333}, /* [MMDC_MPRDDQBY1DL] MMDC PHY Read DQ Byte1 Delay Register */
+
+ {0x021B082C, 0xf3333333}, /* [MMDC_MPWRDQBY0DL] MMDC PHY Write DQ Byte0 Delay Register */
+ {0x021B0830, 0xf3333333}, /* [MMDC_MPWRDQBY1DL] MMDC PHY Write DQ Byte1 Delay Register */
+
+ {0x021B08C0, 0x00944009}, /* [MMDC_MPDCCR] MMDC Duty Cycle Control Register */
+
+ /* Complete calibration by forced measurement: */
+ {0x021B08B8, 0x00000800}, /* DDR_PHY_P0_MPMUR0, frc_msr */
+
+ /* ====================================================== */
+ /* MMDC init: */
+ /* ====================================================== */
+ {0x021B0004, 0x0002002D}, /* MMDC0_MDPDC */
+ {0x021B0008, 0x1B333030}, /* MMDC0_MDOTC */
+ {0x021B000C, 0x616552F3}, /* MMDC0_MDCFG0 */
+ {0x021B0010, 0xB62C0A63}, /* MMDC0_MDCFG1 */
+ {0x021B0014, 0x01FF00DB}, /* MMDC0_MDCFG2 */
+ {0x021B0018, 0x00201740}, /* MMDC0_MDMISC */
+ {0x021B002C, 0x000026D2}, /* MMDC0_MDRWD; recommend to maintain the default values */
+ {0x021B0030, 0x00651023}, /* MMDC0_MDOR */
+ {0x021B0040, 0x0000004F}, /* CS0_END */
+ {0x021B0000, 0x84180000}, /* MMDC0_MDCTL */
+
+ /* Mode register writes for CS0 */
+ {0x021B001C, 0x02008032}, /* MMDC0_MDSCR, MR2 write, CS0 */
+ {0x021B001C, 0x00008033}, /* MMDC0_MDSCR, MR3 write, CS0 */
+ {0x021B001C, 0x00048031}, /* MMDC0_MDSCR, MR1 write, CS0 */
+ {0x021B001C, 0x15208030}, /* MMDC0_MDSCR, MR0 write, CS0 */
+ {0x021B001C, 0x04008040},
+ /* MMDC0_MDSCR, ZQ calibration command sent to device on CS0 */
+
+ /* Mode register writes for CS, commented out automatically if only */
+ /* one chip select used */
+ /* {0x021B001C,0x0200803A}, */
+ /* {0x021B001C,0x0000803B}, */
+ /* {0x021B001C,0x00048039}, */
+ /* {0x021B001C,0x15208038}, */
+ /* {0x021B001C,0x04008048}, */
+
+ /* final DDR setup, before operation start: */
+ {0x021B0020, 0x00000800}, /* MMDC0_MDREF */
+ {0x021B0818, 0x00000227}, /* DDR_PHY_P0_MPODTCTRL */
+ {0x021B0004, 0x0002556D}, /* MMDC0_MDPDC now SDCTL power down enabled */
+ {0x021B0404, 0x00011006}, /* MMDC0_MAPSR ADOPT power down enabled */
+ {0x021B001C, 0x00000000}, /* MMDC0_MDSCR, clear this register */
+ /* (especially the configuration bit as initialization is complete) */
+};
+
+struct dram_timing_info bsh_dram_timing_512mb = {
+ .ddrc_cfg = ddr_ddrc_cfg_512mb,
+ .ddrc_cfg_num = ARRAY_SIZE(ddr_ddrc_cfg_512mb),
+ .dram_size = SZ_512M,
+};
diff --git a/board/bsh/imx6ulz_smm_m2/spl.c b/board/bsh/imx6ulz_smm_m2/spl.c
index 7aea73f0f5d..580f5ab9dff 100644
--- a/board/bsh/imx6ulz_smm_m2/spl.c
+++ b/board/bsh/imx6ulz_smm_m2/spl.c
@@ -53,9 +53,7 @@ static void ddr_cfg_write(const struct dram_timing_info *dram_timing_info)
}

static const struct dram_timing_info *board_dram_timing[] = {
-#if defined(CONFIG_M2_MEMORY)
&bsh_dram_timing_512mb,
-#endif
&bsh_dram_timing_256mb,
&bsh_dram_timing_128mb,
};
--
2.48.1