x86: fsp: Add comments about U-Boot entering start.S twice

Add some comments in start.S for the fact that with FSP U-Boot
actually enters the code twice. Also change to use fsp_init()
and fsp_continue for accuracy.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/x86/Kconfig

@@ -229,7 +229,7 @@ config FSP_TEMP_RAM_ADDR
 	depends on HAVE_FSP
 	default 0x2000000
 	help
-	  Stack top address which is used in FspInit after DRAM is ready and
+	  Stack top address which is used in fsp_init() after DRAM is ready and
 	  CAR is disabled.
 
 config FSP_SYS_MALLOC_F_LEN

arch/x86/cpu/start.S

@@ -115,8 +115,10 @@ car_init_ret:
 #endif
 #else
 	/*
-	 * When we get here after car_init(), esp points to a temporary stack
-	 * and esi holds the HOB list address returned by the FSP.
+	 * U-Boot enters here twice. For the first time it comes from
+	 * car_init_done() with esp points to a temporary stack and esi
+	 * set to zero. For the second time it comes from fsp_init_done()
+	 * with esi holding the HOB list address returned by the FSP.
 	 */
 #endif
 	/* Set up global data */

arch/x86/lib/fsp/fsp_car.S

@@ -64,7 +64,7 @@ temp_ram_init_ret:
 .global fsp_init_done
 fsp_init_done:
 	/*
-	 * We come here from FspInit with eax pointing to the HOB list.
+	 * We come here from fsp_continue() with eax pointing to the HOB list.
 	 * Save eax to esi temporarily.
 	 */
 	movl	%eax, %esi