[PATCH 1/2] ARM: imx: Force DRAM regulators into FPWM mode on Data Modul i.MX8M Plus eDM SBC
In case the Buck5 and Buck6 regulators which supply DRAM Vdd1 and Vdd2/Vddq respectively operate in automatic PWM/PFM mode, the DRAM EDAC detects more correctable errors than if the regulators operate in forced PWM only mode. Force DRAM regulators to forced PWM mode only to stop tempting the DRAM.
Signed-off-by: Marek Vasut marex@denx.de --- Cc: "NXP i.MX U-Boot Team" uboot-imx@nxp.com Cc: Fabio Estevam festevam@gmail.com Cc: Stefano Babic sbabic@denx.de --- board/data_modul/imx8mp_edm_sbc/spl.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/board/data_modul/imx8mp_edm_sbc/spl.c b/board/data_modul/imx8mp_edm_sbc/spl.c index cfc4b65e0f9..a3600c8568a 100644 --- a/board/data_modul/imx8mp_edm_sbc/spl.c +++ b/board/data_modul/imx8mp_edm_sbc/spl.c @@ -68,6 +68,11 @@ int data_modul_imx_edm_sbc_board_power_init(void) /* To avoid timing risk from SoC to ARM, increase VDD_ARM to OD voltage 0.95V */ pmic_reg_write(dev, PCA9450_BUCK2OUT_DVS0, 0x1c);
+ /* DRAM Vdd1 always FPWM */ + pmic_reg_write(dev, PCA9450_BUCK5CTRL, 0x0d); + /* DRAM Vdd2/Vddq always FPWM */ + pmic_reg_write(dev, PCA9450_BUCK6CTRL, 0x0d); + /* Set LDO4 and CONFIG2 to enable the I2C level translator. */ pmic_reg_write(dev, PCA9450_LDO4CTRL, 0x59); pmic_reg_write(dev, PCA9450_CONFIG2, 0x1);
Import DRAM timings generated by the DDR tool 3.31 which introduce assorted tweaks to the DRAM controller settings. Furthermore, enable DBI to improve noise resilience of the DRAM bus by reducing the number of bit changes on the bus.
Reduce the DRAM rate to 3600 MTps to remove all remaining correctable errors reported by EDAC . It is not entirely clear why the slightly faster setting does produce sporadic correctable errors, while this one does not, but this could be related to simpler PLL setting at 3600 MTps.
Enable inline ECC which is necessary to detect ECC errors and collect statistics by the EDAC driver in Linux. This reduces the DRAM size by 64 MiB for each 512 MiB of DRAM, so for a 4 GiB device the available DRAM size becomes 3.5 GiB .
Signed-off-by: Marek Vasut marex@denx.de --- Cc: "NXP i.MX U-Boot Team" uboot-imx@nxp.com Cc: Fabio Estevam festevam@gmail.com Cc: Stefano Babic sbabic@denx.de --- board/data_modul/common/common.c | 18 +- .../imx8mp_edm_sbc/lpddr4_timing_4G_32.c | 175 ++++++++++-------- configs/imx8mp_data_modul_edm_sbc_defconfig | 1 + 3 files changed, 120 insertions(+), 74 deletions(-)
diff --git a/board/data_modul/common/common.c b/board/data_modul/common/common.c index bf9a11472d1..a6761c21d40 100644 --- a/board/data_modul/common/common.c +++ b/board/data_modul/common/common.c @@ -30,6 +30,8 @@ DECLARE_GLOBAL_DATA_PTR;
#define WDOG_PAD_CTRL (PAD_CTL_DSE6 | PAD_CTL_ODE | PAD_CTL_PUE | PAD_CTL_PE)
+#define DDRC_ECCCFG0_ECC_MODE_MASK 0x7 + u8 dmo_get_memcfg(void) { struct gpio_desc gpio[4]; @@ -58,8 +60,16 @@ u8 dmo_get_memcfg(void) int board_phys_sdram_size(phys_size_t *size) { u8 memcfg = dmo_get_memcfg(); + u8 ecc = 0; + + *size = 4ULL >> ((memcfg >> 1) & 0x3); + + if (IS_ENABLED(CONFIG_IMX8M_DRAM_INLINE_ECC)) { + /* 896 MiB, i.e. 1 GiB without 12.5% reserved for in-band ECC */ + ecc = readl(DDRC_ECCCFG0(0)) & DDRC_ECCCFG0_ECC_MODE_MASK; + }
- *size = (4ULL >> ((memcfg >> 1) & 0x3)) * SZ_1G; + *size *= SZ_1G - (ecc ? (SZ_1G / 8) : 0);
return 0; } @@ -100,6 +110,12 @@ static void spl_dram_init(struct dram_timing_info *dram_timing_info[8]) }
ddr_init(dram_timing_info[memcfg]); + + if (IS_ENABLED(CONFIG_IMX8M_DRAM_INLINE_ECC)) { + printf("DDR: Inline ECC %sabled\n", + (readl(DDRC_ECCCFG0(0)) & DDRC_ECCCFG0_ECC_MODE_MASK) ? + "en" : "dis"); + } }
void dmo_board_init_f(const iomux_v3_cfg_t wdog_pad, diff --git a/board/data_modul/imx8mp_edm_sbc/lpddr4_timing_4G_32.c b/board/data_modul/imx8mp_edm_sbc/lpddr4_timing_4G_32.c index 04cef3a8b9f..0ad40002d4e 100644 --- a/board/data_modul/imx8mp_edm_sbc/lpddr4_timing_4G_32.c +++ b/board/data_modul/imx8mp_edm_sbc/lpddr4_timing_4G_32.c @@ -19,47 +19,66 @@ static struct dram_cfg_param ddr_ddrc_cfg[] = { { 0x3d400030, 0x1 }, { 0x3d400000, 0xa3080020 }, { 0x3d400020, 0x1303 }, - { 0x3d400024, 0x1c79100 }, + { 0x3d400024, 0x1c7cf80 }, { 0x3d400064, 0x710106 }, +#if IS_ENABLED(CONFIG_IMX8M_DRAM_INLINE_ECC) + { 0x3d400070, 0x7027fd4 }, +#else { 0x3d400070, 0x7027f90 }, +#endif { 0x3d400074, 0x790 }, - { 0x3d4000d0, 0xc0030720 }, + { 0x3d4000d0, 0xc0030721 }, { 0x3d4000d4, 0xb80000 }, - { 0x3d4000dc, 0xe40036 }, - { 0x3d4000e0, 0x330000 }, + { 0x3d4000dc, 0xf4003f }, + { 0x3d4000e0, 0xf30000 }, { 0x3d4000e8, 0x660048 }, { 0x3d4000ec, 0x160048 }, - { 0x3d400100, 0x1e262028 }, - { 0x3d400104, 0x7073b }, + { 0x3d400100, 0x1f262028 }, + { 0x3d400104, 0x8083b }, { 0x3d40010c, 0xe0e000 }, { 0x3d400110, 0x11040a11 }, - { 0x3d400114, 0x2050e0e }, - { 0x3d400118, 0x1010008 }, - { 0x3d40011c, 0x501 }, - { 0x3d400130, 0x20700 }, + { 0x3d400114, 0x2050f0f }, + { 0x3d400118, 0x1010009 }, + { 0x3d40011c, 0x502 }, + { 0x3d400130, 0x20800 }, { 0x3d400134, 0xe100002 }, { 0x3d400138, 0x10d }, { 0x3d400144, 0xbb005e }, - { 0x3d400180, 0x3a5001c }, - { 0x3d400184, 0x2f071e5 }, + { 0x3d400180, 0x3a6001d }, + { 0x3d400184, 0x2f071f4 }, { 0x3d400188, 0x0 }, - { 0x3d400190, 0x49b820c }, + { 0x3d400190, 0x4a3820e }, { 0x3d400194, 0x80303 }, - { 0x3d4001b4, 0x1b0c }, + { 0x3d4001b4, 0x230e }, { 0x3d4001a0, 0xe0400018 }, { 0x3d4001a4, 0xdf00e4 }, { 0x3d4001a8, 0x80000000 }, { 0x3d4001b0, 0x11 }, - { 0x3d4001c0, 0x1 }, + { 0x3d4001c0, 0x7 }, { 0x3d4001c4, 0x1 }, - { 0x3d4000f4, 0xc99 }, - { 0x3d400108, 0x810191a }, + { 0x3d4000f4, 0x799 }, + { 0x3d400108, 0x9141c1c }, +#if IS_ENABLED(CONFIG_IMX8M_DRAM_INLINE_ECC) + { 0x3d400200, 0x14 }, +#else { 0x3d400200, 0x17 }, +#endif + { 0x3d400208, 0x0 }, +#if IS_ENABLED(CONFIG_IMX8M_DRAM_INLINE_ECC) + { 0x3d40020c, 0x14141400 }, +#else { 0x3d40020c, 0x0 }, +#endif { 0x3d400210, 0x1f1f }, +#if IS_ENABLED(CONFIG_IMX8M_DRAM_INLINE_ECC) + { 0x3d400204, 0x50505 }, + { 0x3d400214, 0x4040404 }, + { 0x3d400218, 0x4040404 }, +#else { 0x3d400204, 0x80808 }, { 0x3d400214, 0x7070707 }, { 0x3d400218, 0x7070707 }, +#endif { 0x3d40021c, 0xf0f }, { 0x3d400250, 0x1705 }, { 0x3d400254, 0x2c }, @@ -78,7 +97,7 @@ static struct dram_cfg_param ddr_ddrc_cfg[] = { { 0x3d402050, 0x20d000 }, { 0x3d402064, 0xc001c }, { 0x3d4020dc, 0x840000 }, - { 0x3d4020e0, 0x330000 }, + { 0x3d4020e0, 0xf30000 }, { 0x3d4020e8, 0x660048 }, { 0x3d4020ec, 0x160048 }, { 0x3d402100, 0xa040305 }, @@ -88,7 +107,7 @@ static struct dram_cfg_param ddr_ddrc_cfg[] = { { 0x3d402110, 0x2040202 }, { 0x3d402114, 0x2030202 }, { 0x3d402118, 0x1010004 }, - { 0x3d40211c, 0x301 }, + { 0x3d40211c, 0x302 }, { 0x3d402130, 0x20300 }, { 0x3d402134, 0xa100002 }, { 0x3d402138, 0x1d }, @@ -97,13 +116,13 @@ static struct dram_cfg_param ddr_ddrc_cfg[] = { { 0x3d402190, 0x3818200 }, { 0x3d402194, 0x80303 }, { 0x3d4021b4, 0x100 }, - { 0x3d4020f4, 0xc99 }, + { 0x3d4020f4, 0x599 }, { 0x3d403020, 0x1001 }, { 0x3d403024, 0xc3500 }, { 0x3d403050, 0x20d000 }, { 0x3d403064, 0x30007 }, { 0x3d4030dc, 0x840000 }, - { 0x3d4030e0, 0x330000 }, + { 0x3d4030e0, 0xf30000 }, { 0x3d4030e8, 0x660048 }, { 0x3d4030ec, 0x160048 }, { 0x3d403100, 0xa010102 }, @@ -113,7 +132,7 @@ static struct dram_cfg_param ddr_ddrc_cfg[] = { { 0x3d403110, 0x2040202 }, { 0x3d403114, 0x2030202 }, { 0x3d403118, 0x1010004 }, - { 0x3d40311c, 0x301 }, + { 0x3d40311c, 0x302 }, { 0x3d403130, 0x20300 }, { 0x3d403134, 0xa100002 }, { 0x3d403138, 0x8 }, @@ -122,7 +141,7 @@ static struct dram_cfg_param ddr_ddrc_cfg[] = { { 0x3d403190, 0x3818200 }, { 0x3d403194, 0x80303 }, { 0x3d4031b4, 0x100 }, - { 0x3d4030f4, 0xc99 }, + { 0x3d4030f4, 0x599 }, { 0x3d400028, 0x0 }, };
@@ -260,16 +279,16 @@ static struct dram_cfg_param ddr_ddrphy_cfg[] = { { 0x212149, 0xeba }, { 0x213049, 0xeba }, { 0x213149, 0xeba }, - { 0x43, 0xe7 }, - { 0x1043, 0xe7 }, - { 0x2043, 0xe7 }, - { 0x3043, 0xe7 }, - { 0x4043, 0xe7 }, - { 0x5043, 0xe7 }, - { 0x6043, 0xe7 }, - { 0x7043, 0xe7 }, - { 0x8043, 0xe7 }, - { 0x9043, 0xe7 }, + { 0x43, 0x3ff }, + { 0x1043, 0x3ff }, + { 0x2043, 0x3ff }, + { 0x3043, 0x3ff }, + { 0x4043, 0x3ff }, + { 0x5043, 0x3ff }, + { 0x6043, 0x3ff }, + { 0x7043, 0x3ff }, + { 0x8043, 0x3ff }, + { 0x9043, 0x3ff }, { 0x20018, 0x3 }, { 0x20075, 0x4 }, { 0x20050, 0x0 }, @@ -319,19 +338,15 @@ static struct dram_cfg_param ddr_ddrphy_cfg[] = { { 0x200f6, 0x0 }, { 0x200f7, 0xf000 }, { 0x20025, 0x0 }, - { 0x2002d, 0x0 }, - { 0x12002d, 0x0 }, - { 0x22002d, 0x0 }, + { 0x2002d, 0x1 }, + { 0x12002d, 0x1 }, + { 0x22002d, 0x1 }, { 0x2007d, 0x212 }, { 0x12007d, 0x212 }, { 0x22007d, 0x212 }, { 0x2007c, 0x61 }, { 0x12007c, 0x61 }, { 0x22007c, 0x61 }, - { 0x1004a, 0x500 }, - { 0x1104a, 0x500 }, - { 0x1204a, 0x500 }, - { 0x1304a, 0x500 }, { 0x2002c, 0x0 }, };
@@ -1061,7 +1076,7 @@ static struct dram_cfg_param ddr_ddrphy_trained_csr[] = { /* P0 message block paremeter for training firmware */ static struct dram_cfg_param ddr_fsp0_cfg[] = { { 0xd0000, 0x0 }, - { 0x54003, 0xe94 }, + { 0x54003, 0xe96 }, { 0x54004, 0x2 }, { 0x54005, 0x2228 }, { 0x54006, 0x14 }, @@ -1070,26 +1085,26 @@ static struct dram_cfg_param ddr_fsp0_cfg[] = { { 0x5400b, 0x2 }, { 0x5400f, 0x100 }, { 0x54012, 0x310 }, - { 0x54019, 0x36e4 }, - { 0x5401a, 0x33 }, + { 0x54019, 0x3ff4 }, + { 0x5401a, 0xf3 }, { 0x5401b, 0x4866 }, { 0x5401c, 0x4800 }, { 0x5401e, 0x16 }, - { 0x5401f, 0x36e4 }, - { 0x54020, 0x33 }, + { 0x5401f, 0x3ff4 }, + { 0x54020, 0xf3 }, { 0x54021, 0x4866 }, { 0x54022, 0x4800 }, { 0x54024, 0x16 }, { 0x5402b, 0x1000 }, { 0x5402c, 0x3 }, - { 0x54032, 0xe400 }, - { 0x54033, 0x3336 }, + { 0x54032, 0xf400 }, + { 0x54033, 0xf33f }, { 0x54034, 0x6600 }, { 0x54035, 0x48 }, { 0x54036, 0x48 }, { 0x54037, 0x1600 }, - { 0x54038, 0xe400 }, - { 0x54039, 0x3336 }, + { 0x54038, 0xf400 }, + { 0x54039, 0xf33f }, { 0x5403a, 0x6600 }, { 0x5403b, 0x48 }, { 0x5403c, 0x48 }, @@ -1111,25 +1126,25 @@ static struct dram_cfg_param ddr_fsp1_cfg[] = { { 0x5400f, 0x100 }, { 0x54012, 0x310 }, { 0x54019, 0x84 }, - { 0x5401a, 0x33 }, + { 0x5401a, 0xf3 }, { 0x5401b, 0x4866 }, { 0x5401c, 0x4800 }, { 0x5401e, 0x16 }, { 0x5401f, 0x84 }, - { 0x54020, 0x33 }, + { 0x54020, 0xf3 }, { 0x54021, 0x4866 }, { 0x54022, 0x4800 }, { 0x54024, 0x16 }, { 0x5402b, 0x1000 }, { 0x5402c, 0x3 }, { 0x54032, 0x8400 }, - { 0x54033, 0x3300 }, + { 0x54033, 0xf300 }, { 0x54034, 0x6600 }, { 0x54035, 0x48 }, { 0x54036, 0x48 }, { 0x54037, 0x1600 }, { 0x54038, 0x8400 }, - { 0x54039, 0x3300 }, + { 0x54039, 0xf300 }, { 0x5403a, 0x6600 }, { 0x5403b, 0x48 }, { 0x5403c, 0x48 }, @@ -1151,25 +1166,25 @@ static struct dram_cfg_param ddr_fsp2_cfg[] = { { 0x5400f, 0x100 }, { 0x54012, 0x310 }, { 0x54019, 0x84 }, - { 0x5401a, 0x33 }, + { 0x5401a, 0xf3 }, { 0x5401b, 0x4866 }, { 0x5401c, 0x4800 }, { 0x5401e, 0x16 }, { 0x5401f, 0x84 }, - { 0x54020, 0x33 }, + { 0x54020, 0xf3 }, { 0x54021, 0x4866 }, { 0x54022, 0x4800 }, { 0x54024, 0x16 }, { 0x5402b, 0x1000 }, { 0x5402c, 0x3 }, { 0x54032, 0x8400 }, - { 0x54033, 0x3300 }, + { 0x54033, 0xf300 }, { 0x54034, 0x6600 }, { 0x54035, 0x48 }, { 0x54036, 0x48 }, { 0x54037, 0x1600 }, { 0x54038, 0x8400 }, - { 0x54039, 0x3300 }, + { 0x54039, 0xf300 }, { 0x5403a, 0x6600 }, { 0x5403b, 0x48 }, { 0x5403c, 0x48 }, @@ -1180,7 +1195,7 @@ static struct dram_cfg_param ddr_fsp2_cfg[] = { /* P0 2D message block paremeter for training firmware */ static struct dram_cfg_param ddr_fsp0_2d_cfg[] = { { 0xd0000, 0x0 }, - { 0x54003, 0xe94 }, + { 0x54003, 0xe96 }, { 0x54004, 0x2 }, { 0x54005, 0x2228 }, { 0x54006, 0x14 }, @@ -1190,26 +1205,26 @@ static struct dram_cfg_param ddr_fsp0_2d_cfg[] = { { 0x5400f, 0x100 }, { 0x54010, 0x1f7f }, { 0x54012, 0x310 }, - { 0x54019, 0x36e4 }, - { 0x5401a, 0x33 }, + { 0x54019, 0x3ff4 }, + { 0x5401a, 0xf3 }, { 0x5401b, 0x4866 }, { 0x5401c, 0x4800 }, { 0x5401e, 0x16 }, - { 0x5401f, 0x36e4 }, - { 0x54020, 0x33 }, + { 0x5401f, 0x3ff4 }, + { 0x54020, 0xf3 }, { 0x54021, 0x4866 }, { 0x54022, 0x4800 }, { 0x54024, 0x16 }, { 0x5402b, 0x1000 }, { 0x5402c, 0x3 }, - { 0x54032, 0xe400 }, - { 0x54033, 0x3336 }, + { 0x54032, 0xf400 }, + { 0x54033, 0xf33f }, { 0x54034, 0x6600 }, { 0x54035, 0x48 }, { 0x54036, 0x48 }, { 0x54037, 0x1600 }, - { 0x54038, 0xe400 }, - { 0x54039, 0x3336 }, + { 0x54038, 0xf400 }, + { 0x54039, 0xf33f }, { 0x5403a, 0x6600 }, { 0x5403b, 0x48 }, { 0x5403c, 0x48 }, @@ -1699,9 +1714,9 @@ static struct dram_cfg_param ddr_phy_pie[] = { { 0x400d7, 0x20b }, { 0x2003a, 0x2 }, { 0x200be, 0x3 }, - { 0x2000b, 0x419 }, + { 0x2000b, 0x41a }, { 0x2000c, 0xe9 }, - { 0x2000d, 0x91c }, + { 0x2000d, 0x91d }, { 0x2000e, 0x2c }, { 0x12000b, 0x70 }, { 0x12000c, 0x19 }, @@ -1804,8 +1819,8 @@ static struct dram_cfg_param ddr_phy_pie[] = {
static struct dram_fsp_msg ddr_dram_fsp_msg[] = { { - /* P0 3733mts 1D */ - .drate = 3733, + /* P0 3600mts 1D */ + .drate = 3600, .fw_type = FW_1D_IMAGE, .fsp_cfg = ddr_fsp0_cfg, .fsp_cfg_num = ARRAY_SIZE(ddr_fsp0_cfg), @@ -1825,8 +1840,8 @@ static struct dram_fsp_msg ddr_dram_fsp_msg[] = { .fsp_cfg_num = ARRAY_SIZE(ddr_fsp2_cfg), }, { - /* P0 3733mts 2D */ - .drate = 3733, + /* P0 3600mts 2D */ + .drate = 3600, .fw_type = FW_2D_IMAGE, .fsp_cfg = ddr_fsp0_2d_cfg, .fsp_cfg_num = ARRAY_SIZE(ddr_fsp0_2d_cfg), @@ -1845,5 +1860,19 @@ struct dram_timing_info dmo_imx8mp_sbc_dram_timing_32_32 = { .ddrphy_trained_csr_num = ARRAY_SIZE(ddr_ddrphy_trained_csr), .ddrphy_pie = ddr_phy_pie, .ddrphy_pie_num = ARRAY_SIZE(ddr_phy_pie), - .fsp_table = { 3733, 400, 100, }, + .fsp_table = { 3600, 400, 100, }, }; + +#if IS_ENABLED(CONFIG_IMX8M_DRAM_INLINE_ECC) +void board_dram_ecc_scrub(void) +{ + ddrc_inline_ecc_scrub(0x0,0x7ffffff); + ddrc_inline_ecc_scrub(0x8000000,0xfffffff); + ddrc_inline_ecc_scrub(0x10000000,0x17ffffff); + ddrc_inline_ecc_scrub(0x18000000,0x1fffffff); + ddrc_inline_ecc_scrub(0x20000000,0x27ffffff); + ddrc_inline_ecc_scrub(0x28000000,0x2fffffff); + ddrc_inline_ecc_scrub(0x30000000,0x37ffffff); + ddrc_inline_ecc_scrub_end(0x0,0x3fffffff); +} +#endif diff --git a/configs/imx8mp_data_modul_edm_sbc_defconfig b/configs/imx8mp_data_modul_edm_sbc_defconfig index 76f9b4ae130..f5914ac2a80 100644 --- a/configs/imx8mp_data_modul_edm_sbc_defconfig +++ b/configs/imx8mp_data_modul_edm_sbc_defconfig @@ -170,6 +170,7 @@ CONFIG_CLK_COMPOSITE_CCF=y CONFIG_SPL_CLK_IMX8MP=y CONFIG_CLK_IMX8MP=y CONFIG_FSL_CAAM=y +CONFIG_IMX8M_DRAM_INLINE_ECC=y CONFIG_DFU_TFTP=y CONFIG_DFU_TIMEOUT=y CONFIG_DFU_MMC=y
On Thu, Dec 7, 2023 at 2:51 PM Marek Vasut marex@denx.de wrote:
Import DRAM timings generated by the DDR tool 3.31 which introduce assorted tweaks to the DRAM controller settings. Furthermore, enable DBI to improve noise resilience of the DRAM bus by reducing the number of bit changes on the bus.
Reduce the DRAM rate to 3600 MTps to remove all remaining correctable errors reported by EDAC . It is not entirely clear why the slightly faster setting does produce sporadic correctable errors, while this one does not, but this could be related to simpler PLL setting at 3600 MTps.
Enable inline ECC which is necessary to detect ECC errors and collect statistics by the EDAC driver in Linux. This reduces the DRAM size by 64 MiB for each 512 MiB of DRAM, so for a 4 GiB device the available DRAM size becomes 3.5 GiB .
Signed-off-by: Marek Vasut marex@denx.de
Reviewed-by: Fabio Estevam festevam@gmail.com
On Thu, Dec 7, 2023 at 2:51 PM Marek Vasut marex@denx.de wrote:
In case the Buck5 and Buck6 regulators which supply DRAM Vdd1 and Vdd2/Vddq respectively operate in automatic PWM/PFM mode, the DRAM EDAC detects more correctable errors than if the regulators operate in forced PWM only mode. Force DRAM regulators to forced PWM mode only to stop tempting the DRAM.
Signed-off-by: Marek Vasut marex@denx.de
Reviewed-by: Fabio Estevam festevam@gmail.com
On Thu, Dec 7, 2023 at 2:51 PM Marek Vasut marex@denx.de wrote:
In case the Buck5 and Buck6 regulators which supply DRAM Vdd1 and Vdd2/Vddq respectively operate in automatic PWM/PFM mode, the DRAM EDAC detects more correctable errors than if the regulators operate in forced PWM only mode. Force DRAM regulators to forced PWM mode only to stop tempting the DRAM.
Signed-off-by: Marek Vasut marex@denx.de
Applied both to u-boot-imx master, thanks.
participants (2)
-
Fabio Estevam -
Marek Vasut