soc/intel/xeon_sp/cpx: Allow motherboards to set FSP-M parameters

We need to allow motherboards to configure certain parameters that
are specific to it. Hence, invoke this function. Also, provide a
weak motherboard implementation that does nothing.

Change-Id: Ifa2824811273236a66e742404856fbe17d4cf496
Signed-off-by: Andrey Petrov <anpetrov@fb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40552
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Maxim Polyakov <max.senia.poliak@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/xeon_sp/cpx/romstage.c

@@ -3,6 +3,7 @@
 
 #include <arch/romstage.h>
 #include <fsp/api.h>
+#include <soc/romstage.h>
 #include "chip.h"
 
 void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd, uint32_t version)
@@ -10,4 +11,6 @@ void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd, uint32_t version)
 	FSP_M_CONFIG *m_cfg = &mupd->FspmConfig;
 
 	(void)m_cfg;
+
+	mainboard_memory_init_params(mupd);
 }

src/soc/intel/xeon_sp/romstage.c

@@ -55,3 +55,8 @@ asmlinkage void car_stage_entry(void)
 
 	run_postcar_phase(&pcf);
 }
+
+__weak void mainboard_memory_init_params(FSPM_UPD *mupd)
+{
+	printk(BIOS_SPEW, "WARNING: using default FSP-M parameters!\n");
+}