On Fri, 2011-09-16 at 14:15 -0500, Timur Tabi wrote: > York Sun wrote: > > +Interactive DDR debugging > > +=========================== > > + > > +For DDR parameter tuning up and debugging, the interactive DDR debugging > > can > > +be activated by saving an environment variable "ddr_interactive". The value > > +doesn't matter. Once activated, U-boot prompts "FSL DDR>" before enabling > > DDR > > +controller. The available commands can be seen by typing "help". > > + > > +The example flow of using interactive debugging is > > +type command "compute" to calculate the parameters from the default > > +type command "print" with arguments to show SPD, options, registers > > +type command "edit" with arguments to change any if desired > > +type command "go" to continue calculation and enable DDR controller > > + > > +Note, check "next_step" to show the flow. For example, after editing > > registers, > > +DDR controller will be enabled with current setting without further > > +calculation. > > This is pretty skimpy for such a powerful feature. How about some examples > and > a detailed description of each command? > I think the interactive command is self-explained. I can add some examples if needed. But I am afraid the example will be either too short or too long.
For example, I can add the following First step, run "compute" command, it returns with the DIMM part number FSL DDR>compute Detected UDIMM UG51U6400N8SU-ACF Second step, users can run 'print' command with arguments. Without argument, a help message will print out FSL DDR>print print [c<n>] [d<n>] [spd] [dimmparms] [commonparms] [opts] [addresses] [regs] FSL DDR>print dimmparms DIMM parameters: Controller=0 DIMM=0 DIMM organization parameters: module part name = UG51U6400N8SU-ACF rank_density = 2147483648 bytes (2048 megabytes) capacity = 4294967296 bytes (4096 megabytes) burst_lengths_bitmask = 0C base_addresss = 0 (00000000 00000000) n_ranks = 2 data_width = 64 primary_sdram_width = 64 ec_sdram_width = 0 registered_dimm = 0 n_row_addr = 15 n_col_addr = 10 edc_config = 0 n_banks_per_sdram_device = 8 tCKmin_X_ps = 1500 tCKmin_X_minus_1_ps = 0 tCKmin_X_minus_2_ps = 0 tCKmax_ps = 0 caslat_X = 960 tAA_ps = 13125 caslat_X_minus_1 = 0 caslat_X_minus_2 = 0 caslat_lowest_derated = 0 tRCD_ps = 13125 tRP_ps = 13125 tRAS_ps = 36000 tWR_ps = 15000 tWTR_ps = 7500 tRFC_ps = 160000 tRRD_ps = 6000 tRC_ps = 49125 refresh_rate_ps = 7800000 tIS_ps = 0 tIH_ps = 0 tDS_ps = 0 tDH_ps = 0 tRTP_ps = 7500 tDQSQ_max_ps = 0 tQHS_ps = 0 I can further show the examples of print/edit dimmparams, commonparams, opts, regs. It will be too long. It is not difficult to use the self-guided interface. Agree? York _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
