Merge https://source.denx.de/u-boot/custodians/u-boot-riscvWIP/10Aug2023

+ Add USB host support on VisionFive2 board
+ Enable SPI flash support on VisionFive2 board
+ Enable Random Number Generator in RISC-V QEMU board
+ Display new SBI extension
+ Add SPL_ZERO_MEM_BEFORE_USE Kconfig for jh7110 L2 LIM
  (Loosely-Integrated Memory)

6 files changed, 25 insertions, 26 deletions

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 867cbcb..6771d8d 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -64,6 +64,14 @@ config SPL_SYS_DCACHE_OFF
 	help
 	  Do not enable data cache in SPL.
 
+config SPL_ZERO_MEM_BEFORE_USE
+	bool "Zero memory before use"
+	depends on SPL
+	default n
+	help
+	  Zero stack/GD/malloc area in SPL before using them, this is needed for
+	  Sifive core devices that uses L2 cache to store SPL.
+
 # board-specific options below
 source "board/AndesTech/ae350/Kconfig"
 source "board/emulation/qemu-riscv/Kconfig"
diff --git a/arch/riscv/cpu/jh7110/Kconfig b/arch/riscv/cpu/jh7110/Kconfig
index 4d95811..8469ee7 100644
--- a/arch/riscv/cpu/jh7110/Kconfig
+++ b/arch/riscv/cpu/jh7110/Kconfig
@@ -13,6 +13,8 @@ config STARFIVE_JH7110
 	select SUPPORT_SPL
 	select SPL_RAM if SPL
 	select SPL_STARFIVE_DDR
+	select SYS_CACHE_SHIFT_6
+	select SPL_ZERO_MEM_BEFORE_USE
 	select PINCTRL_STARFIVE_JH7110
 	imply MMC
 	imply MMC_BROKEN_CD
diff --git a/arch/riscv/cpu/jh7110/spl.c b/arch/riscv/cpu/jh7110/spl.c
index 72adcef..4047b10 100644
--- a/arch/riscv/cpu/jh7110/spl.c
+++ b/arch/riscv/cpu/jh7110/spl.c
@@ -13,7 +13,6 @@
 #include <init.h>
 
 #define CSR_U74_FEATURE_DISABLE	0x7c1
-#define L2_LIM_MEM_END	0x81FFFFFUL
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -59,9 +58,6 @@ int spl_soc_init(void)
 
 void harts_early_init(void)
 {
-	ulong *ptr;
-	u8 *tmp;
-	ulong len, remain;
 	/*
 	 * Feature Disable CSR
 	 *
@@ -70,25 +66,4 @@ void harts_early_init(void)
 	 */
 	if (CONFIG_IS_ENABLED(RISCV_MMODE))
 		csr_write(CSR_U74_FEATURE_DISABLE, 0);
-
-	/* clear L2 LIM  memory
-	 * set __bss_end to 0x81FFFFF region to zero
-	 * The L2 Cache Controller supports ECC. ECC is applied to SRAM.
-	 * If it is not cleared, the ECC part is invalid, and an ECC error
-	 * will be reported when reading data.
-	 */
-	ptr = (ulong *)&__bss_end;
-	len = L2_LIM_MEM_END - (ulong)&__bss_end;
-	remain = len % sizeof(ulong);
-	len /= sizeof(ulong);
-
-	while (len--)
-		*ptr++ = 0;
-
-	/* clear the remain bytes */
-	if (remain) {
-		tmp = (u8 *)ptr;
-		while (remain--)
-			*tmp++ = 0;
-	}
 }
diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S
index 59d58a5..30cf674 100644
--- a/arch/riscv/cpu/start.S
+++ b/arch/riscv/cpu/start.S
@@ -111,6 +111,18 @@ call_board_init_f:
  * It's essential before any function call, otherwise, we get data-race.
  */
 
+/* clear stack if necessary */
+#if CONFIG_IS_ENABLED(ZERO_MEM_BEFORE_USE)
+clear_stack:
+	li	t1, 1
+	slli	t1, t1, CONFIG_STACK_SIZE_SHIFT
+	sub	t1, sp, t1
+clear_stack_loop:
+	SREG	zero, 0(t1)		/* t1 is always 16 byte aligned */
+	addi	t1, t1, REGBYTES
+	blt	t1, sp, clear_stack_loop
+#endif
+
 call_board_init_f_0:
 	/* find top of reserve space */
 #if CONFIG_IS_ENABLED(SMP)
diff --git a/arch/riscv/dts/jh7110-starfive-visionfive-2.dtsi b/arch/riscv/dts/jh7110-starfive-visionfive-2.dtsi
index bf7fdb4..e40f57a 100644
--- a/arch/riscv/dts/jh7110-starfive-visionfive-2.dtsi
+++ b/arch/riscv/dts/jh7110-starfive-visionfive-2.dtsi
@@ -311,7 +311,7 @@
 
 &pcie0 {
 	reset-gpios = <&sysgpio 26 GPIO_ACTIVE_LOW>;
-	status = "disabled";
+	status = "okay";
 };
 
 &pcie1 {
diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 7693699..009a268 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -31,6 +31,8 @@ enum sbi_ext_id {
 	SBI_EXT_DBCN = 0x4442434E,
 	SBI_EXT_SUSP = 0x53555350,
 	SBI_EXT_CPPC = 0x43505043,
+	SBI_EXT_NACL = 0x4E41434C,
+	SBI_EXT_STA = 0x535441,
 };
 
 enum sbi_ext_base_fid {