riscv: qemu: Implement is_flash_available() for MTD NOR

Currently, if MTD NOR is enabled then U-Boot tries to issue flash
commands even when CFI flash DT node is not present. This causes
access fault on RISC-V emulators or ISS which do not emulate CFI
flash. To handle this issue, we implement is_flash_available() for
qemu-riscv board which will return 1 only if CFI flash DT node is
present.

Fixes: d248627f9d42 ("riscv: qemu: Enable MTD NOR flash support")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/board/emulation/qemu-riscv/qemu-riscv.c b/board/emulation/qemu-riscv/qemu-riscv.c
index b0d9dd5..ae3b7a3 100644 (file)
--- a/board/emulation/qemu-riscv/qemu-riscv.c
+++ b/board/emulation/qemu-riscv/qemu-riscv.c
@@ -5,6 +5,7 @@
 
 #include <common.h>
 #include <dm.h>
+#include <dm/ofnode.h>
 #include <env.h>
 #include <fdtdec.h>
 #include <image.h>
@@ -16,6 +17,17 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#if IS_ENABLED(CONFIG_MTD_NOR_FLASH)
+int is_flash_available(void)
+{
+       if (!ofnode_equal(ofnode_by_compatible(ofnode_null(), "cfi-flash"),
+                         ofnode_null()))
+               return 1;
+
+       return 0;
+}
+#endif
+
 int board_init(void)
 {
        /*