23  * where: sdram capacity  = spd byte4[3:0]
28  *	bit[3:0]	size(bit)	size(byte)
64 		nbit_primary_bus_width = (spd->bus_width & 0x7) + 3;  in compute_ranksize()
68 	bsize = 1ULL << (nbit_sdram_cap_bsize - 3  in compute_ranksize()
119 	pdimm->n_ranks = ((spd->organization >> 3) & 0x7) + 1;  in ddr_compute_dimm_parameters()
122 	pdimm->primary_sdram_width = 1 << (3 + (spd->bus_width & 0x7));  in ddr_compute_dimm_parameters()
123 	if ((spd->bus_width >> 3) & 0x3)  in ddr_compute_dimm_parameters()
168 	pdimm->n_row_addr = ((spd->addressing >> 3) & 0x7) + 12;  in ddr_compute_dimm_parameters()
190 	 * The unit in the SPD spec is ns,  in ddr_compute_dimm_parameters()
192 	 * eg: MTB = 0.125ns (125ps)  in ddr_compute_dimm_parameters()
207 	 * we assume the MTB is 0.125ns  in ddr_compute_dimm_parameters()
209 	 * tck_min=15 MTB (1.875ns) ->DDR3-1066  in ddr_compute_dimm_parameters()
210 	 *        =12 MTB (1.5ns) ->DDR3-1333  in ddr_compute_dimm_parameters()
211 	 *        =10 MTB (1.25ns) ->DDR3-1600  in ddr_compute_dimm_parameters()
227 	 * DDR3-800D	100 MTB (12.5ns)  in ddr_compute_dimm_parameters()
228 	 * DDR3-1066F	105 MTB (13.125ns)  in ddr_compute_dimm_parameters()
229 	 * DDR3-1333H	108 MTB (13.5ns)  in ddr_compute_dimm_parameters()
230 	 * DDR3-1600H	90 MTB (11.25ns)  in ddr_compute_dimm_parameters()
238 	 * twr_min = 120 MTB (15ns) -> all speed grades.  in ddr_compute_dimm_parameters()
245 	 * DDR3-800	100 MTB (12.5ns)  in ddr_compute_dimm_parameters()
246 	 * DDR3-1066F	105 MTB (13.125ns)  in ddr_compute_dimm_parameters()
247 	 * DDR3-1333H	108 MTB (13.5ns)  in ddr_compute_dimm_parameters()
256 	 * DDR3-800(1KB page)	80 MTB (10ns)  in ddr_compute_dimm_parameters()
257 	 * DDR3-1333(1KB page)	48 MTB (6ns)  in ddr_compute_dimm_parameters()
264 	 * DDR3-800D	100 MTB (12.5ns)  in ddr_compute_dimm_parameters()
265 	 * DDR3-1066F	105 MTB (13.125ns)  in ddr_compute_dimm_parameters()
266 	 * DDR3-1333H	108 MTB (13.5ns)  in ddr_compute_dimm_parameters()
267 	 * DDR3-1600H	90 MTB (11.25ns)  in ddr_compute_dimm_parameters()
274 	 * DDR3-800D	300 MTB (37.5ns)  in ddr_compute_dimm_parameters()
275 	 * DDR3-1066F	300 MTB (37.5ns)  in ddr_compute_dimm_parameters()
276 	 * DDR3-1333H	288 MTB (36ns)  in ddr_compute_dimm_parameters()
277 	 * DDR3-1600H	280 MTB (35ns)  in ddr_compute_dimm_parameters()
284 	 * DDR3-800D	400 MTB (50ns)  in ddr_compute_dimm_parameters()
285 	 * DDR3-1066F	405 MTB (50.625ns)  in ddr_compute_dimm_parameters()
286 	 * DDR3-1333H	396 MTB (49.5ns)  in ddr_compute_dimm_parameters()
287 	 * DDR3-1600H	370 MTB (46.25ns)  in ddr_compute_dimm_parameters()
294 	 * 512Mb	720 MTB (90ns)  in ddr_compute_dimm_parameters()
295 	 * 1Gb		880 MTB (110ns)  in ddr_compute_dimm_parameters()
296 	 * 2Gb		1280 MTB (160ns)  in ddr_compute_dimm_parameters()
302 	 * eg: twtr_min = 40 MTB (7.5ns) - all speed bins.  in ddr_compute_dimm_parameters()
309 	 * eg: trtp_min = 40 MTB (7.5ns) - all speed bins.  in ddr_compute_dimm_parameters()
328 	 * DDR3-800(1KB page)	320 MTB (40ns)  in ddr_compute_dimm_parameters()
329 	 * DDR3-1066(1KB page)	300 MTB (37.5ns)  in ddr_compute_dimm_parameters()
330 	 * DDR3-1333(1KB page)	240 MTB (30ns)  in ddr_compute_dimm_parameters()
331 	 * DDR3-1600(1KB page)	240 MTB (30ns)  in ddr_compute_dimm_parameters()