system/fastboot: Add support for oem mkrd command

To support creating RAM disk on device via fastboot on host side.

Usage

    fastboot oem mkrd <minor> <nsectors> <sectsize>

Test

    0. The "esp32s3-devkit:fastboot" configuration with `SYSTEM_FASTBOOTD_MKRD` enabled

        ./tools/configure.sh -l esp32s3-devkit:fastboot
	# Enable `SYSTEM_FASTBOOTD_MKRD`
	make menuconfig

    1. List "ram10" on device side

        nsh> ls /dev/ram10
        nsh: ls: stat failed: 2

    2. Create RAM disk "ram10" on host side

        $ fastboot -s 1234 oem mkrd 10 2 512
                                                           OKAY [  0.001s]
        Finished. Total time: 0.001s

    3. List "ram10" on device side, again

	nsh> ls -l /dev/ram10
	 brw-rw-rw-        1024 /dev/ram10

Signed-off-by: wangjianyu3 <[email protected]>

system/fastboot/Kconfig

@@ -32,4 +32,11 @@ config SYSTEM_FASTBOOTD_USB_BOARDCTL
 	---help---
 		Connect usbdev before running fastboot daemon.
 
+config SYSTEM_FASTBOOTD_MKRD
+	bool "Create RAM disk"
+	default n
+	depends on BOARDCTL_MKRD
+	---help---
+		fastboot oem mkrd <minor> <nsectors> <sectsize>
+
 endif # SYSTEM_FASTBOOTD

system/fastboot/fastboot.c

@@ -27,6 +27,9 @@
 #include <nuttx/config.h>
 #include <nuttx/mtd/mtd.h>
 #include <nuttx/version.h>
+#ifdef CONFIG_SYSTEM_FASTBOOTD_MKRD
+#include <nuttx/drivers/ramdisk.h>
+#endif
 
 #include <errno.h>
 #include <fcntl.h>
@@ -180,6 +183,10 @@ static void fastboot_memdump(FAR struct fastboot_ctx_s *context,
                              FAR const char *arg);
 static void fastboot_filedump(FAR struct fastboot_ctx_s *context,
                               FAR const char *arg);
+#ifdef CONFIG_SYSTEM_FASTBOOTD_MKRD
+static void fastboot_mkrd(FAR struct fastboot_ctx_s *context,
+                          FAR const char *arg);
+#endif
 
 /****************************************************************************
  * Private Data
@@ -200,7 +207,10 @@ static const struct fastboot_cmd_s g_fast_cmd[] =
 static const struct fastboot_cmd_s g_oem_cmd[] =
 {
   { "filedump",           fastboot_filedump         },
-  { "memdump",            fastboot_memdump          }
+  { "memdump",            fastboot_memdump          },
+#ifdef CONFIG_SYSTEM_FASTBOOTD_MKRD
+  { "mkrd",               fastboot_mkrd             },
+#endif
 };
 
 /****************************************************************************
@@ -776,6 +786,38 @@ static void fastboot_filedump(FAR struct fastboot_ctx_s *context,
   fastboot_okay(context, "");
 }
 
+#ifdef CONFIG_SYSTEM_FASTBOOTD_MKRD
+static void fastboot_mkrd(FAR struct fastboot_ctx_s *context,
+                          FAR const char *arg)
+{
+  struct boardioc_mkrd_s desc;
+  int ret = -1;
+
+  if (arg != NULL)
+    {
+      ret = sscanf(arg, "%" SCNu8 " %" SCNu32 " %" SCNu16,
+                   &desc.minor, &desc.nsectors, &desc.sectsize);
+    }
+
+  if (ret != 3)
+    {
+      fastboot_fail(context, "Usage: mkrd <minor> <nsectors> <sectsize>");
+      return;
+    }
+
+  desc.rdflags  = RDFLAG_WRENABLED | RDFLAG_FUNLINK;
+
+  ret = boardctl(BOARDIOC_MKRD, (uintptr_t)&desc);
+  if (ret < 0)
+    {
+      fastboot_fail(context, "Create RAM disk failed %d", ret);
+      return;
+    }
+
+  fastboot_okay(context, "");
+}
+#endif
+
 static void fastboot_upload(FAR struct fastboot_ctx_s *context,
                             FAR const char *arg)
 {