soc: nuvoton: numicro: Disable m48x SPIM cache

By disabling m48x SPIM cache by default, the SRAM size increases
by 32 KB to a total of 160 KB.

Signed-off-by: cyliang tw <[email protected]>

Author: cyliangtw

soc/nuvoton/numicro/m48x/soc.c

@@ -12,6 +12,11 @@ void soc_reset_hook(void)
 {
 	SYS_UnlockReg();
 
+	/* Disable SPIM cache to relocate 32 KB to SRAM */
+	CLK->AHBCLK |= CLK_AHBCLK_SPIMCKEN_Msk;
+	SPIM->CTL1 |= SPIM_CTL1_CACHEOFF_Msk;
+	SPIM->CTL1 |= SPIM_CTL1_CCMEN_Msk;
+
 	/* system clock init */
 	SystemInit();