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Diffstat (limited to 'Documentation/Intel/SoC')
| -rw-r--r-- | Documentation/Intel/SoC/soc.html | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/Documentation/Intel/SoC/soc.html b/Documentation/Intel/SoC/soc.html index 0b0615d049..b5daac8fb5 100644 --- a/Documentation/Intel/SoC/soc.html +++ b/Documentation/Intel/SoC/soc.html @@ -22,6 +22,8 @@ <li><a href="#Romstage">Romstage</a> <ol type="A"> <li>Enable <a href="#SerialOutput">Serial Output"</a></li> + <li>Get the <a href="#PreviousSleepState">Previous Sleep State</a></li> + <li>Add the <a href="#MemoryInit">MemoryInit</a> Support</li> </ol> </li> </ol> @@ -328,6 +330,57 @@ Use the following steps to debug the call to TempRamInit: </ol> +<h2><a name="PreviousSleepState">Determine Previous Sleep State</a></h2> +<p> + The following steps implement the code to get the previous sleep state: +</p> +<ol> + <li>Implement the fill_power_state routine which determines the previous sleep state</li> + <li>Debug the result until port 0x80 outputs + <ol type="A"> + <li>0x32: + - Just after entering + <a target="_blank" href="http://review.coreboot.org/gitweb?p=coreboot.git;a=blob;f=src/drivers/intel/fsp1_1/romstage.c;hb=HEAD#l99">romstage_common</a> + </li> + <li>0x33 - Just after calling + <a target="_blank" href="http://review.coreboot.org/gitweb?p=coreboot.git;a=blob;f=src/drivers/intel/fsp1_1/romstage.c;hb=HEAD#l113">soc_pre_ram_init</a> + </li> + <li>0x34: + - Just after entering + <a target="_blank" href="http://review.coreboot.org/gitweb?p=coreboot.git;a=blob;f=src/drivers/intel/fsp1_1/raminit.c;hb=HEAD#l67">raminit</a> + </li> + </ol> +</ol> + + +<h2><a name="MemoryInit">MemoryInit Support</a></h2> +<p> + The following steps implement the code to support the FSP MemoryInit call: +</p> +<ol> + <li>Add the chip.h header file to define the UPD values which get passed + to MemoryInit. Skip the values containing SPD addresses and DRAM + configuration data which is determined by the board. + <p> + <b>Build Note</b>: The src/mainboard/<Vendor>/<Board>/devicetree.cb + file specifies the default values for these parameters. The build + process creates the static.c module which contains the config data + structure containing these values. + </p> + </li> + <li>Edit romstage/romstage.c + <ol type="A"> + <li>Implement the romstage/romstage.c/soc_memory_init_params routine to + copy the values from the config structure into the UPD structure + </li> + <li>Implement the soc_display_memory_init_params routine to display + the updated UPD parameters by calling fsp_display_upd_value + </li> + </ol> + </li> +</ol> + + <hr> <p>Modified: 31 January 2016</p> </body> |