From 91e25769771c1164ed63ffca0add49f934ae3343 Mon Sep 17 00:00:00 2001 From: Paul Gortmaker Date: Tue, 16 Jan 2007 11:38:14 -0500 Subject: mpc83xx: U-Boot support for Wind River SBC8349 I've redone the SBC8349 support to match git-current, which incorporates all the MPC834x updates from Freescale since the 1.1.6 release, including the DDR changes. I've kept all the SBC8349 files as parallel as possible to the MPC8349EMDS ones for ease of maintenance and to allow for easy inspection of what was changed to support this board. Hence the SBC8349 U-Boot has FDT support and everything else that the MPC8349EMDS has. Fortunately the Freescale updates added support for boards using CS0, but I had to change spd_sdram.c to allow for board specific settings for the sdram_clk_cntl (it is/was hard coded to zero, and that remains the default if the board doesn't specify a value.) Hopefully this should be mergeable as-is and require no whitespace cleanups or similar, but if something doesn't measure up then let me know and I'll fix it. Thanks, Paul. --- cpu/mpc83xx/spd_sdram.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'cpu/mpc83xx/spd_sdram.c') diff --git a/cpu/mpc83xx/spd_sdram.c b/cpu/mpc83xx/spd_sdram.c index 0d93f2e1ea..108328a7f4 100644 --- a/cpu/mpc83xx/spd_sdram.c +++ b/cpu/mpc83xx/spd_sdram.c @@ -440,10 +440,14 @@ long int spd_sdram() ddr->sdram_interval = ((refresh_clk & 0x3fff) << 16) | 0x100; debug("DDR:sdram_interval=0x%08x\n", ddr->sdram_interval); +#ifdef CFG_DDR_SDRAM_CLK_CNTL /* Optional platform specific value */ + ddr->sdram_clk_cntl = CFG_DDR_SDRAM_CLK_CNTL; +#else /* SS_EN = 0, source synchronous disable * CLK_ADJST = 0, MCK/MCK# is launched aligned with addr/cmd */ ddr->sdram_clk_cntl = 0x00000000; +#endif debug("DDR:sdram_clk_cntl=0x%08x\n", ddr->sdram_clk_cntl); asm("sync;isync"); -- cgit From d61853cf2472e0b8bcbd131461a93d1c49ff0c1f Mon Sep 17 00:00:00 2001 From: Xie Xiaobo Date: Wed, 14 Feb 2007 18:27:17 +0800 Subject: mpc83xx: Add DDR2 controller fixed/SPD Init for MPC83xx The code supply fixed and SPD initialization for MPC83xx DDR2 Controller. it pass DDR/DDR2 compliance tests. Signed-off-by: Xie Xiaobo --- cpu/mpc83xx/spd_sdram.c | 384 ++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 323 insertions(+), 61 deletions(-) (limited to 'cpu/mpc83xx/spd_sdram.c') diff --git a/cpu/mpc83xx/spd_sdram.c b/cpu/mpc83xx/spd_sdram.c index 108328a7f4..d9b8753ca0 100644 --- a/cpu/mpc83xx/spd_sdram.c +++ b/cpu/mpc83xx/spd_sdram.c @@ -106,16 +106,29 @@ long int spd_sdram() volatile ddr83xx_t *ddr = &immap->ddr; volatile law83xx_t *ecm = &immap->sysconf.ddrlaw[0]; spd_eeprom_t spd; + unsigned int n_ranks; + unsigned int odt_rd_cfg, odt_wr_cfg; + unsigned char twr_clk, twtr_clk; + unsigned char sdram_type; unsigned int memsize; unsigned int law_size; unsigned char caslat, caslat_ctrl; + unsigned int trfc, trfc_clk, trfc_low, trfc_high; + unsigned int trcd_clk, trtp_clk; + unsigned char cke_min_clk; + unsigned char add_lat, wr_lat; + unsigned char wr_data_delay; + unsigned char four_act; + unsigned char cpo; unsigned char burstlen; + unsigned char odt_cfg, mode_odt_enable; unsigned int max_bus_clk; unsigned int max_data_rate, effective_data_rate; unsigned int ddrc_clk; unsigned int refresh_clk; - unsigned sdram_cfg; + unsigned int sdram_cfg; unsigned int ddrc_ecc_enable; + unsigned int pvr = get_pvr(); /* Read SPD parameters with I2C */ CFG_READ_SPD(SPD_EEPROM_ADDRESS, 0, 1, (uchar *) & spd, sizeof (spd)); @@ -123,19 +136,25 @@ long int spd_sdram() spd_debug(&spd); #endif /* Check the memory type */ - if (spd.mem_type != SPD_MEMTYPE_DDR) { + if (spd.mem_type != SPD_MEMTYPE_DDR && spd.mem_type != SPD_MEMTYPE_DDR2) { printf("DDR: Module mem type is %02X\n", spd.mem_type); return 0; } /* Check the number of physical bank */ - if (spd.nrows > 2) { - printf("DDR: The number of physical bank is %02X\n", spd.nrows); + if (spd.mem_type == SPD_MEMTYPE_DDR) { + n_ranks = spd.nrows; + } else { + n_ranks = (spd.nrows & 0x7) + 1; + } + + if (n_ranks > 2) { + printf("DDR: The number of physical bank is %02X\n", n_ranks); return 0; } /* Check if the number of row of the module is in the range of DDRC */ - if (spd.nrow_addr < 12 || spd.nrow_addr > 14) { + if (spd.nrow_addr < 12 || spd.nrow_addr > 15) { printf("DDR: Row number is out of range of DDRC, row=%02X\n", spd.nrow_addr); return 0; @@ -147,20 +166,43 @@ long int spd_sdram() spd.ncol_addr); return 0; } + +#ifdef CFG_DDRCDR_VALUE + /* + * Adjust DDR II IO voltage biasing. It just makes it work. + */ + if(spd.mem_type == SPD_MEMTYPE_DDR2) { + immap->sysconf.ddrcdr = CFG_DDRCDR_VALUE; + } +#endif + + /* + * ODT configuration recommendation from DDR Controller Chapter. + */ + odt_rd_cfg = 0; /* Never assert ODT */ + odt_wr_cfg = 0; /* Never assert ODT */ + if (spd.mem_type == SPD_MEMTYPE_DDR2) { + odt_wr_cfg = 1; /* Assert ODT on writes to CSn */ + } + /* Setup DDR chip select register */ #ifdef CFG_83XX_DDR_USES_CS0 ddr->csbnds[0].csbnds = (banksize(spd.row_dens) >> 24) - 1; ddr->cs_config[0] = ( 1 << 31 + | (odt_rd_cfg << 20) + | (odt_wr_cfg << 16) | (spd.nrow_addr - 12) << 8 | (spd.ncol_addr - 8) ); debug("\n"); debug("cs0_bnds = 0x%08x\n",ddr->csbnds[0].csbnds); debug("cs0_config = 0x%08x\n",ddr->cs_config[0]); - if (spd.nrows == 2) { + if (n_ranks == 2) { ddr->csbnds[1].csbnds = ( (banksize(spd.row_dens) >> 8) | ((banksize(spd.row_dens) >> 23) - 1) ); ddr->cs_config[1] = ( 1<<31 + | (odt_rd_cfg << 20) + | (odt_wr_cfg << 16) | (spd.nrow_addr-12) << 8 | (spd.ncol_addr-8) ); debug("cs1_bnds = 0x%08x\n",ddr->csbnds[1].csbnds); @@ -170,16 +212,20 @@ long int spd_sdram() #else ddr->csbnds[2].csbnds = (banksize(spd.row_dens) >> 24) - 1; ddr->cs_config[2] = ( 1 << 31 + | (odt_rd_cfg << 20) + | (odt_wr_cfg << 16) | (spd.nrow_addr - 12) << 8 | (spd.ncol_addr - 8) ); debug("\n"); debug("cs2_bnds = 0x%08x\n",ddr->csbnds[2].csbnds); debug("cs2_config = 0x%08x\n",ddr->cs_config[2]); - if (spd.nrows == 2) { + if (n_ranks == 2) { ddr->csbnds[3].csbnds = ( (banksize(spd.row_dens) >> 8) | ((banksize(spd.row_dens) >> 23) - 1) ); ddr->cs_config[3] = ( 1<<31 + | (odt_rd_cfg << 20) + | (odt_wr_cfg << 16) | (spd.nrow_addr-12) << 8 | (spd.ncol_addr-8) ); debug("cs3_bnds = 0x%08x\n",ddr->csbnds[3].csbnds); @@ -187,15 +233,10 @@ long int spd_sdram() } #endif - if (spd.mem_type != 0x07) { - puts("No DDR module found!\n"); - return 0; - } - /* * Figure out memory size in Megabytes. */ - memsize = spd.nrows * banksize(spd.row_dens) / 0x100000; + memsize = n_ranks * banksize(spd.row_dens) / 0x100000; /* * First supported LAW size is 16M, at LAWAR_SIZE_16M == 23. @@ -215,24 +256,32 @@ long int spd_sdram() * in the spd.cas_lat field. Translate it to a DDR * controller field value: * - * CAS Lat DDR I Ctrl - * Clocks SPD Bit Value - * -------+--------+--------- - * 1.0 0 001 - * 1.5 1 010 - * 2.0 2 011 - * 2.5 3 100 - * 3.0 4 101 - * 3.5 5 110 - * 4.0 6 111 + * CAS Lat DDR I DDR II Ctrl + * Clocks SPD Bit SPD Bit Value + * ------- ------- ------- ----- + * 1.0 0 0001 + * 1.5 1 0010 + * 2.0 2 2 0011 + * 2.5 3 0100 + * 3.0 4 3 0101 + * 3.5 5 0110 + * 4.0 6 4 0111 + * 4.5 1000 + * 5.0 5 1001 */ caslat = __ilog2(spd.cas_lat); - - if (caslat > 6 ) { - printf("DDR: Invalid SPD CAS Latency, caslat=%02X\n", - spd.cas_lat); + if ((spd.mem_type == SPD_MEMTYPE_DDR) + && (caslat > 6)) { + printf("DDR I: Invalid SPD CAS Latency: 0x%x.\n", spd.cas_lat); + return 0; + } else if (spd.mem_type == SPD_MEMTYPE_DDR2 + && (caslat < 2 || caslat > 5)) { + printf("DDR II: Invalid SPD CAS Latency: 0x%x.\n", + spd.cas_lat); return 0; } + debug("DDR: caslat SPD bit is %d\n", caslat); + max_bus_clk = 1000 *10 / (((spd.clk_cycle & 0xF0) >> 4) * 10 + (spd.clk_cycle & 0x0f)); max_data_rate = max_bus_clk * 2; @@ -240,10 +289,11 @@ long int spd_sdram() debug("DDR:Module maximum data rate is: %dMhz\n", max_data_rate); ddrc_clk = gd->ddr_clk / 1000000; + effective_data_rate = 0; - if (max_data_rate >= 390) { /* it is DDR 400 */ - if (ddrc_clk <= 410 && ddrc_clk > 350) { - /* DDR controller clk at 350~410 */ + if (max_data_rate >= 390 && max_data_rate < 460) { /* it is DDR 400 */ + if (ddrc_clk <= 460 && ddrc_clk > 350) { + /* DDR controller clk at 350~460 */ effective_data_rate = 400; /* 5ns */ caslat = caslat; } else if (ddrc_clk <= 350 && ddrc_clk > 280) { @@ -258,16 +308,16 @@ long int spd_sdram() effective_data_rate = 266; /* 7.5ns */ if (spd.clk_cycle3 == 0x75) caslat = caslat - 2; - else if (spd.clk_cycle2 == 0x60) + else if (spd.clk_cycle2 == 0x75) caslat = caslat - 1; else caslat = caslat; } else if (ddrc_clk <= 230 && ddrc_clk > 90) { /* DDR controller clk at 90~230 */ effective_data_rate = 200; /* 10ns */ - if (spd.clk_cycle3 == 0x75) + if (spd.clk_cycle3 == 0xa0) caslat = caslat - 2; - else if (spd.clk_cycle2 == 0x60) + else if (spd.clk_cycle2 == 0xa0) caslat = caslat - 1; else caslat = caslat; @@ -289,7 +339,7 @@ long int spd_sdram() effective_data_rate = 200; /* 10ns */ if (spd.clk_cycle3 == 0xa0) caslat = caslat - 2; - else if (spd.clk_cycle2 == 0x75) + else if (spd.clk_cycle2 == 0xa0) caslat = caslat - 1; else caslat = caslat; @@ -330,41 +380,197 @@ long int spd_sdram() * Errata DDR6 work around: input enable 2 cycles earlier. * including MPC834x Rev1.0/1.1 and MPC8360 Rev1.1/1.2. */ - if (caslat == 2) - ddr->debug_reg = 0x201c0000; /* CL=2 */ - else if (caslat == 3) - ddr->debug_reg = 0x202c0000; /* CL=2.5 */ - else if (caslat == 4) - ddr->debug_reg = 0x202c0000; /* CL=3.0 */ + if(PVR_MAJ(pvr) <= 1 && spd.mem_type == SPD_MEMTYPE_DDR){ + if (caslat == 2) + ddr->debug_reg = 0x201c0000; /* CL=2 */ + else if (caslat == 3) + ddr->debug_reg = 0x202c0000; /* CL=2.5 */ + else if (caslat == 4) + ddr->debug_reg = 0x202c0000; /* CL=3.0 */ - __asm__ __volatile__ ("sync"); + __asm__ __volatile__ ("sync"); - debug("Errata DDR6 (debug_reg=0x%08x)\n", ddr->debug_reg); + debug("Errata DDR6 (debug_reg=0x%08x)\n", ddr->debug_reg); + } /* - * note: caslat must also be programmed into ddr->sdram_mode - * register. - * - * note: WRREC(Twr) and WRTORD(Twtr) are not in SPD, - * use conservative value here. + * Convert caslat clocks to DDR controller value. + * Force caslat_ctrl to be DDR Controller field-sized. */ - caslat_ctrl = (caslat + 1) & 0x07; /* see as above */ + if (spd.mem_type == SPD_MEMTYPE_DDR) { + caslat_ctrl = (caslat + 1) & 0x07; + } else { + caslat_ctrl = (2 * caslat - 1) & 0x0f; + } + + debug("DDR: effective data rate is %d MHz\n", effective_data_rate); + debug("DDR: caslat SPD bit is %d, controller field is 0x%x\n", + caslat, caslat_ctrl); + + /* + * Timing Config 0. + * Avoid writing for DDR I. + */ + if (spd.mem_type == SPD_MEMTYPE_DDR2) { + unsigned char taxpd_clk = 8; /* By the book. */ + unsigned char tmrd_clk = 2; /* By the book. */ + unsigned char act_pd_exit = 2; /* Empirical? */ + unsigned char pre_pd_exit = 6; /* Empirical? */ + + ddr->timing_cfg_0 = (0 + | ((act_pd_exit & 0x7) << 20) /* ACT_PD_EXIT */ + | ((pre_pd_exit & 0x7) << 16) /* PRE_PD_EXIT */ + | ((taxpd_clk & 0xf) << 8) /* ODT_PD_EXIT */ + | ((tmrd_clk & 0xf) << 0) /* MRS_CYC */ + ); + debug("DDR: timing_cfg_0 = 0x%08x\n", ddr->timing_cfg_0); + } + + /* + * For DDR I, WRREC(Twr) and WRTORD(Twtr) are not in SPD, + * use conservative value. + * For DDR II, they are bytes 36 and 37, in quarter nanos. + */ + + if (spd.mem_type == SPD_MEMTYPE_DDR) { + twr_clk = 3; /* Clocks */ + twtr_clk = 1; /* Clocks */ + } else { + twr_clk = picos_to_clk(spd.twr * 250); + twtr_clk = picos_to_clk(spd.twtr * 250); + } + + /* + * Calculate Trfc, in picos. + * DDR I: Byte 42 straight up in ns. + * DDR II: Byte 40 and 42 swizzled some, in ns. + */ + if (spd.mem_type == SPD_MEMTYPE_DDR) { + trfc = spd.trfc * 1000; /* up to ps */ + } else { + unsigned int byte40_table_ps[8] = { + 0, + 250, + 330, + 500, + 660, + 750, + 0, + 0 + }; + + trfc = (((spd.trctrfc_ext & 0x1) * 256) + spd.trfc) * 1000 + + byte40_table_ps[(spd.trctrfc_ext >> 1) & 0x7]; + } + trfc_clk = picos_to_clk(trfc); + + /* + * Trcd, Byte 29, from quarter nanos to ps and clocks. + */ + trcd_clk = picos_to_clk(spd.trcd * 250) & 0x7; + + /* + * Convert trfc_clk to DDR controller fields. DDR I should + * fit in the REFREC field (16-19) of TIMING_CFG_1, but the + * 83xx controller has an extended REFREC field of three bits. + * The controller automatically adds 8 clocks to this value, + * so preadjust it down 8 first before splitting it up. + */ + trfc_low = (trfc_clk - 8) & 0xf; + trfc_high = ((trfc_clk - 8) >> 4) & 0x3; ddr->timing_cfg_1 = - (((picos_to_clk(spd.trp * 250) & 0x07) << 28 ) | - ((picos_to_clk(spd.tras * 1000) & 0x0f ) << 24 ) | - ((picos_to_clk(spd.trcd * 250) & 0x07) << 20 ) | - ((caslat_ctrl & 0x07) << 16 ) | - (((picos_to_clk(spd.trfc * 1000) - 8) & 0x0f) << 12 ) | - ( 0x300 ) | - ((picos_to_clk(spd.trrd * 250) & 0x07) << 4) | 1); + (((picos_to_clk(spd.trp * 250) & 0x07) << 28 ) | /* PRETOACT */ + ((picos_to_clk(spd.tras * 1000) & 0x0f ) << 24 ) | /* ACTTOPRE */ + (trcd_clk << 20 ) | /* ACTTORW */ + (caslat_ctrl << 16 ) | /* CASLAT */ + (trfc_low << 12 ) | /* REFEC */ + ((twr_clk & 0x07) << 8) | /* WRRREC */ + ((picos_to_clk(spd.trrd * 250) & 0x07) << 4) | /* ACTTOACT */ + ((twtr_clk & 0x07) << 0) /* WRTORD */ + ); + + /* + * Additive Latency + * For DDR I, 0. + * For DDR II, with ODT enabled, use "a value" less than ACTTORW, + * which comes from Trcd, and also note that: + * add_lat + caslat must be >= 4 + */ + add_lat = 0; + if (spd.mem_type == SPD_MEMTYPE_DDR2 + && (odt_wr_cfg || odt_rd_cfg) + && (caslat < 4)) { + add_lat = trcd_clk - 1; + if ((add_lat + caslat) < 4) { + add_lat = 0; + } + } + + /* + * Write Data Delay + * Historically 0x2 == 4/8 clock delay. + * Empirically, 0x3 == 6/8 clock delay is suggested for DDR I 266. + */ + wr_data_delay = 2; + + /* + * Write Latency + * Read to Precharge + * Minimum CKE Pulse Width. + * Four Activate Window + */ + if (spd.mem_type == SPD_MEMTYPE_DDR) { + /* + * This is a lie. It should really be 1, but if it is + * set to 1, bits overlap into the old controller's + * otherwise unused ACSM field. If we leave it 0, then + * the HW will magically treat it as 1 for DDR 1. Oh Yea. + */ + wr_lat = 0; + + trtp_clk = 2; /* By the book. */ + cke_min_clk = 1; /* By the book. */ + four_act = 1; /* By the book. */ + + } else { + wr_lat = caslat - 1; + + /* Convert SPD value from quarter nanos to picos. */ + trtp_clk = picos_to_clk(spd.trtp * 250); - ddr->timing_cfg_2 = 0x00000800; + cke_min_clk = 3; /* By the book. */ + four_act = picos_to_clk(37500); /* By the book. 1k pages? */ + } + + /* + * Empirically set ~MCAS-to-preamble override for DDR 2. + * Your milage will vary. + */ + cpo = 0; + if (spd.mem_type == SPD_MEMTYPE_DDR2) { + if (effective_data_rate == 266 || effective_data_rate == 333) { + cpo = 0x7; /* READ_LAT + 5/4 */ + } else if (effective_data_rate == 400) { + cpo = 0x9; /* READ_LAT + 7/4 */ + } else { + /* Automatic calibration */ + cpo = 0x1f; + } + } + + ddr->timing_cfg_2 = (0 + | ((add_lat & 0x7) << 28) /* ADD_LAT */ + | ((cpo & 0x1f) << 23) /* CPO */ + | ((wr_lat & 0x7) << 19) /* WR_LAT */ + | ((trtp_clk & 0x7) << 13) /* RD_TO_PRE */ + | ((wr_data_delay & 0x7) << 10) /* WR_DATA_DELAY */ + | ((cke_min_clk & 0x7) << 6) /* CKE_PLS */ + | ((four_act & 0x1f) << 0) /* FOUR_ACT */ + ); debug("DDR:timing_cfg_1=0x%08x\n", ddr->timing_cfg_1); debug("DDR:timing_cfg_2=0x%08x\n", ddr->timing_cfg_2); - /* Setup init value, but not enable */ - ddr->sdram_cfg = 0x42000000; /* Check DIMM data bus width */ if (spd.dataw_lsb == 0x20) { @@ -384,7 +590,8 @@ long int spd_sdram() /* Burst length is always 4 for 64 bit data bus, 8 for 32 bit data bus, Burst type is sequential */ - switch (caslat) { + if (spd.mem_type == SPD_MEMTYPE_DDR) { + switch (caslat) { case 1: ddr->sdram_mode = 0x50 | burstlen; /* CL=1.5 */ break; @@ -400,9 +607,36 @@ long int spd_sdram() default: printf("DDR:only CL 1.5, 2.0, 2.5, 3.0 is supported\n"); return 0; + } + } else { + mode_odt_enable = 0x0; /* Default disabled */ + if (odt_wr_cfg || odt_rd_cfg) { + /* + * Bits 6 and 2 in Extended MRS(1) + * Bit 2 == 0x04 == 75 Ohm, with 2 DIMM modules. + * Bit 6 == 0x40 == 150 Ohm, with 1 DIMM module. + */ + mode_odt_enable = 0x40; /* 150 Ohm */ + } + + ddr->sdram_mode = + (0 + | (1 << (16 + 10)) /* DQS Differential disable */ + | (add_lat << (16 + 3)) /* Additive Latency in EMRS1 */ + | (mode_odt_enable << 16) /* ODT Enable in EMRS1 */ + | ((twr_clk >> 1) << 9) /* Write Recovery Autopre */ + | (caslat << 4) /* caslat */ + | (burstlen << 0) /* Burst length */ + ); } debug("DDR:sdram_mode=0x%08x\n", ddr->sdram_mode); + /* + * Clear EMRS2 and EMRS3. + */ + ddr->sdram_mode2 = 0; + debug("DDR: sdram_mode2 = 0x%08x\n", ddr->sdram_mode2); + switch (spd.refresh) { case 0x00: case 0x80: @@ -440,6 +674,23 @@ long int spd_sdram() ddr->sdram_interval = ((refresh_clk & 0x3fff) << 16) | 0x100; debug("DDR:sdram_interval=0x%08x\n", ddr->sdram_interval); + /* + * SDRAM Cfg 2 + */ + odt_cfg = 0; + if (odt_rd_cfg | odt_wr_cfg) { + odt_cfg = 0x2; /* ODT to IOs during reads */ + } + if (spd.mem_type == SPD_MEMTYPE_DDR2) { + ddr->sdram_cfg2 = (0 + | (0 << 26) /* True DQS */ + | (odt_cfg << 21) /* ODT only read */ + | (1 << 12) /* 1 refresh at a time */ + ); + + debug("DDR: sdram_cfg2 = 0x%08x\n", ddr->sdram_cfg2); + } + #ifdef CFG_DDR_SDRAM_CLK_CNTL /* Optional platform specific value */ ddr->sdram_clk_cntl = CFG_DDR_SDRAM_CLK_CNTL; #else @@ -462,11 +713,22 @@ long int spd_sdram() * * sdram_cfg[0] = 1 (ddr sdram logic enable) * sdram_cfg[1] = 1 (self-refresh-enable) - * sdram_cfg[6:7] = 2 (SDRAM type = DDR SDRAM) + * sdram_cfg[5:7] = (SDRAM type = DDR SDRAM) + * 010 DDR 1 SDRAM + * 011 DDR 2 SDRAM * sdram_cfg[12] = 0 (32_BE =0 , 64 bit bus mode) * sdram_cfg[13] = 0 (8_BE =0, 4-beat bursts) */ - sdram_cfg = 0xC2000000; + if (spd.mem_type == SPD_MEMTYPE_DDR) + sdram_type = 2; + else + sdram_type = 3; + + sdram_cfg = (0 + | (1 << 31) /* DDR enable */ + | (1 << 30) /* Self refresh */ + | (sdram_type << 24) /* SDRAM type */ + ); /* sdram_cfg[3] = RD_EN - registered DIMM enable */ if (spd.mod_attr & 0x02) -- cgit