Make tmpdevfs visable at ramfs and add mmc aliases to fix the eMMC and SD device descriptor

Eric Lee
1 parent d56e51d211
Showing 8 changed files with 103 additions and 39 deletions Side-by-side Diff
arch/arm/boot/dts/am335x-smarc-common.dtsi
arch/arm/boot/dts/am335x-smarct335x.dts
arch/arm/boot/dts/am33xx.dtsi
arch/arm/configs/smarc_t335x_defconfig
drivers/base/devtmpfs.c
drivers/mmc/card/block.c
init/do_mounts.c
init/main.c
@@ -775,7 +775,18 @@
                                   2 13>;
 };
  
+&mmc2 {
+        vmmc-supply = <&vmmcsd_fixed>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&emmc_pins>;
+        bus-width = <8>;
+        status = "okay";
+        ti,non-removable;
+};
+
+
 &mmc1 {
+	vmmc-supply = <&vmmcsd_fixed>;
 	status = "okay";
 	bus-width = <0x4>;
 	pinctrl-names = "default";
@@ -17,18 +17,6 @@
 	regulator-always-on;
 };
  
-&mmc1 {
-	vmmc-supply = <&vmmcsd_fixed>;
-};
-
-&mmc2 {
-	vmmc-supply = <&vmmcsd_fixed>;
-	pinctrl-names = "default";
-	pinctrl-0 = <&emmc_pins>;
-	bus-width = <8>;
-	status = "okay";
-};
-
 &sgx {
         status = "okay";
 };
@@ -35,6 +35,8 @@
 		phy1 = &usb1_phy;
 		ethernet0 = &cpsw_emac0;
 		ethernet1 = &cpsw_emac1;
+               	mmc1 = &mmc1;   /* Fixed to mmcblk1 for &mmc1 */
+               	mmc0 = &mmc2;   /* Fixed to mmcblk0 for &mmc2 */
 	};
  
 	cpus {
@@ -1810,10 +1810,6 @@
 # CONFIG_MICREL_KS8995MA is not set
 # CONFIG_PPP is not set
 # CONFIG_SLIP is not set
-
-#
-# Host-side USB support is needed for USB Network Adapter support
-#
 CONFIG_USB_NET_DRIVERS=m
 # CONFIG_USB_CATC is not set
 # CONFIG_USB_KAWETH is not set
@@ -3443,7 +3439,7 @@
 CONFIG_USB_SUPPORT=y
 CONFIG_USB_COMMON=y
 CONFIG_USB_ARCH_HAS_HCD=y
-CONFIG_USB=m
+CONFIG_USB=y
 CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
  
 #
@@ -3454,7 +3450,7 @@
 CONFIG_USB_OTG=y
 # CONFIG_USB_OTG_WHITELIST is not set
 # CONFIG_USB_OTG_BLACKLIST_HUB is not set
-CONFIG_USB_MON=m
+CONFIG_USB_MON=y
 # CONFIG_USB_WUSB_CBAF is not set
  
 #
@@ -3499,7 +3495,7 @@
 #
 # also be needed; see USB_STORAGE Help for more info
 #
-CONFIG_USB_STORAGE=m
+CONFIG_USB_STORAGE=y
 # CONFIG_USB_STORAGE_DEBUG is not set
 # CONFIG_USB_STORAGE_REALTEK is not set
 # CONFIG_USB_STORAGE_DATAFAB is not set
  
  
@@ -3522,18 +3518,17 @@
 # CONFIG_USB_MDC800 is not set
 # CONFIG_USB_MICROTEK is not set
 # CONFIG_USBIP_CORE is not set
-CONFIG_USB_MUSB_HDRC=m
-# CONFIG_USB_MUSB_HOST is not set
-# CONFIG_USB_MUSB_GADGET is not set
-CONFIG_USB_MUSB_DUAL_ROLE=y
+CONFIG_USB_MUSB_HDRC=y
+CONFIG_USB_MUSB_HOST=y
  
 #
 # Platform Glue Layer
 #
+# CONFIG_USB_MUSB_TUSB6010 is not set
 CONFIG_USB_MUSB_OMAP2PLUS=m
 CONFIG_USB_MUSB_AM35X=m
-CONFIG_USB_MUSB_DSPS=m
-CONFIG_USB_MUSB_AM335X_CHILD=m
+CONFIG_USB_MUSB_DSPS=y
+CONFIG_USB_MUSB_AM335X_CHILD=y
 # CONFIG_USB_INVENTRA_DMA is not set
 CONFIG_USB_TI_CPPI41_DMA=y
 # CONFIG_MUSB_PIO_ONLY is not set
@@ -3559,7 +3554,57 @@
 #
 # USB port drivers
 #
-# CONFIG_USB_SERIAL is not set
+CONFIG_USB_SERIAL=m
+CONFIG_USB_SERIAL_GENERIC=y
+CONFIG_USB_SERIAL_SIMPLE=m
+# CONFIG_USB_SERIAL_AIRCABLE is not set
+# CONFIG_USB_SERIAL_ARK3116 is not set
+# CONFIG_USB_SERIAL_BELKIN is not set
+# CONFIG_USB_SERIAL_CH341 is not set
+# CONFIG_USB_SERIAL_WHITEHEAT is not set
+# CONFIG_USB_SERIAL_DIGI_ACCELEPORT is not set
+CONFIG_USB_SERIAL_CP210X=m
+# CONFIG_USB_SERIAL_CYPRESS_M8 is not set
+# CONFIG_USB_SERIAL_EMPEG is not set
+CONFIG_USB_SERIAL_FTDI_SIO=m
+# CONFIG_USB_SERIAL_VISOR is not set
+# CONFIG_USB_SERIAL_IPAQ is not set
+# CONFIG_USB_SERIAL_IR is not set
+# CONFIG_USB_SERIAL_EDGEPORT is not set
+# CONFIG_USB_SERIAL_EDGEPORT_TI is not set
+# CONFIG_USB_SERIAL_F81232 is not set
+# CONFIG_USB_SERIAL_GARMIN is not set
+# CONFIG_USB_SERIAL_IPW is not set
+# CONFIG_USB_SERIAL_IUU is not set
+# CONFIG_USB_SERIAL_KEYSPAN_PDA is not set
+# CONFIG_USB_SERIAL_KEYSPAN is not set
+# CONFIG_USB_SERIAL_KLSI is not set
+# CONFIG_USB_SERIAL_KOBIL_SCT is not set
+# CONFIG_USB_SERIAL_MCT_U232 is not set
+# CONFIG_USB_SERIAL_METRO is not set
+# CONFIG_USB_SERIAL_MOS7720 is not set
+# CONFIG_USB_SERIAL_MOS7840 is not set
+# CONFIG_USB_SERIAL_MXUPORT is not set
+# CONFIG_USB_SERIAL_NAVMAN is not set
+CONFIG_USB_SERIAL_PL2303=m
+# CONFIG_USB_SERIAL_OTI6858 is not set
+# CONFIG_USB_SERIAL_QCAUX is not set
+# CONFIG_USB_SERIAL_QUALCOMM is not set
+# CONFIG_USB_SERIAL_SPCP8X5 is not set
+# CONFIG_USB_SERIAL_SAFE is not set
+# CONFIG_USB_SERIAL_SIERRAWIRELESS is not set
+# CONFIG_USB_SERIAL_SYMBOL is not set
+# CONFIG_USB_SERIAL_TI is not set
+# CONFIG_USB_SERIAL_CYBERJACK is not set
+# CONFIG_USB_SERIAL_XIRCOM is not set
+# CONFIG_USB_SERIAL_OPTION is not set
+# CONFIG_USB_SERIAL_OMNINET is not set
+# CONFIG_USB_SERIAL_OPTICON is not set
+# CONFIG_USB_SERIAL_XSENS_MT is not set
+# CONFIG_USB_SERIAL_WISHBONE is not set
+# CONFIG_USB_SERIAL_SSU100 is not set
+# CONFIG_USB_SERIAL_QT2 is not set
+# CONFIG_USB_SERIAL_DEBUG is not set
  
 #
 # USB Miscellaneous drivers
@@ -356,7 +356,8 @@
  
 	err = sys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT, NULL);
 	if (err)
-		printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
+		printk(KERN_ERR "devtmpfs: error %i mounting on %s\n",
+			err, mntdir);
 	else
 		printk(KERN_INFO "devtmpfs: mounted\n");
 	return err;
@@ -35,6 +35,7 @@
 #include <linux/capability.h>
 #include <linux/compat.h>
 #include <linux/pm_runtime.h>
+#include <linux/of.h>
  
 #include <linux/mmc/ioctl.h>
 #include <linux/mmc/card.h>
@@ -2090,6 +2091,7 @@
 {
 	struct mmc_blk_data *md;
 	int devidx, ret;
+	int idx = 0;
  
 	devidx = find_first_zero_bit(dev_use, max_devices);
 	if (devidx >= max_devices)
@@ -2109,7 +2111,20 @@
 	 * index anymore so we keep track of a name index.
 	 */
 	if (!subname) {
-		md->name_idx = find_first_zero_bit(name_use, max_devices);
+		if (card->dev.parent->parent->of_node)
+			idx = of_alias_get_id(card->dev.parent->parent->of_node,
+					"mmc");
+
+		if (idx < 0)
+			md->name_idx = find_first_zero_bit(name_use,
+					max_devices);
+		else {
+			if (test_bit(idx, name_use))
+				md->name_idx = find_first_zero_bit(name_use,
+						max_devices);
+			else
+				md->name_idx = (unsigned int)idx;
+		}
 		__set_bit(md->name_idx, name_use);
 	} else
 		md->name_idx = ((struct mmc_blk_data *)
@@ -594,7 +594,6 @@
  
 	mount_root();
 out:
-	devtmpfs_mount("dev");
 	sys_mount(".", "/", NULL, MS_MOVE, NULL);
 	sys_chroot(".");
 }
  
@@ -609,8 +608,9 @@
 	if (test_and_set_bit(0, &once))
 		return ERR_PTR(-ENODEV);
  
-	if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs)
+	if (is_tmpfs)
 		fill = shmem_fill_super;
+	printk(KERN_INFO "rootfs is %s\n", is_tmpfs ? "tmpfs" : "ramfs");
  
 	return mount_nodev(fs_type, flags, data, fill);
 }
  
@@ -632,9 +632,8 @@
 		(!root_fs_names || strstr(root_fs_names, "tmpfs"))) {
 		err = shmem_init();
 		is_tmpfs = true;
-	} else {
+	} else 
 		err = init_ramfs_fs();
-	}
  
 	if (err)
 		unregister_filesystem(&rootfs_fs_type);
@@ -1001,12 +1001,6 @@
  
 	do_basic_setup();
  
-	/* Open the /dev/console on the rootfs, this should never fail */
-	if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
-		pr_err("Warning: unable to open an initial console.\n");
-
-	(void) sys_dup(0);
-	(void) sys_dup(0);
 	/*
 	 * check if there is an early userspace init.  If yes, let it do all
 	 * the work
@@ -1018,7 +1012,16 @@
 	if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
 		ramdisk_execute_command = NULL;
 		prepare_namespace();
-	}
+	} else if (config_enabled(CONFIG_DEVTMPFS_MOUNT))
+		 sys_mkdir("/dev", 0755);
+	devtmpfs_mount("dev");
+
+	/* Open the /dev/console on the rootfs, this should never fail */
+	if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
+		pr_err("Warning: unable to open an initial console.\n");
+
+	(void) sys_dup(0);
+	(void) sys_dup(0);
  
 	/*
 	 * Ok, we have completed the initial bootup, and
...	...	@@ -775,7 +775,18 @@
775	775	2 13>;
776	776	};
777	777
	778	+&mmc2 {
	779	+ vmmc-supply = <&vmmcsd_fixed>;
	780	+ pinctrl-names = "default";
	781	+ pinctrl-0 = <&emmc_pins>;
	782	+ bus-width = <8>;
	783	+ status = "okay";
	784	+ ti,non-removable;
	785	+};
	786	+
	787	+
778	788	&mmc1 {
	789	+ vmmc-supply = <&vmmcsd_fixed>;
779	790	status = "okay";
780	791	bus-width = <0x4>;
781	792	pinctrl-names = "default";
...	...	@@ -17,18 +17,6 @@
17	17	regulator-always-on;
18	18	};
19	19
20		-&mmc1 {
21		- vmmc-supply = <&vmmcsd_fixed>;
22		-};
23		-
24		-&mmc2 {
25		- vmmc-supply = <&vmmcsd_fixed>;
26		- pinctrl-names = "default";
27		- pinctrl-0 = <&emmc_pins>;
28		- bus-width = <8>;
29		- status = "okay";
30		-};
31		-
32	20	&sgx {
33	21	status = "okay";
34	22	};
...	...	@@ -35,6 +35,8 @@
35	35	phy1 = &usb1_phy;
36	36	ethernet0 = &cpsw_emac0;
37	37	ethernet1 = &cpsw_emac1;
	38	+ mmc1 = &mmc1; /* Fixed to mmcblk1 for &mmc1 */
	39	+ mmc0 = &mmc2; /* Fixed to mmcblk0 for &mmc2 */
38	40	};
39	41
40	42	cpus {
...	...	@@ -1810,10 +1810,6 @@
1810	1810	# CONFIG_MICREL_KS8995MA is not set
1811	1811	# CONFIG_PPP is not set
1812	1812	# CONFIG_SLIP is not set
1813		-
1814		-#
1815		-# Host-side USB support is needed for USB Network Adapter support
1816		-#
1817	1813	CONFIG_USB_NET_DRIVERS=m
1818	1814	# CONFIG_USB_CATC is not set
1819	1815	# CONFIG_USB_KAWETH is not set
...	...	@@ -3443,7 +3439,7 @@
3443	3439	CONFIG_USB_SUPPORT=y
3444	3440	CONFIG_USB_COMMON=y
3445	3441	CONFIG_USB_ARCH_HAS_HCD=y
3446		-CONFIG_USB=m
	3442	+CONFIG_USB=y
3447	3443	CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
3448	3444
3449	3445	#
...	...	@@ -3454,7 +3450,7 @@
3454	3450	CONFIG_USB_OTG=y
3455	3451	# CONFIG_USB_OTG_WHITELIST is not set
3456	3452	# CONFIG_USB_OTG_BLACKLIST_HUB is not set
3457		-CONFIG_USB_MON=m
	3453	+CONFIG_USB_MON=y
3458	3454	# CONFIG_USB_WUSB_CBAF is not set
3459	3455
3460	3456	#
...	...	@@ -3499,7 +3495,7 @@
3499	3495	#
3500	3496	# also be needed; see USB_STORAGE Help for more info
3501	3497	#
3502		-CONFIG_USB_STORAGE=m
	3498	+CONFIG_USB_STORAGE=y
3503	3499	# CONFIG_USB_STORAGE_DEBUG is not set
3504	3500	# CONFIG_USB_STORAGE_REALTEK is not set
3505	3501	# CONFIG_USB_STORAGE_DATAFAB is not set
3506	3502
3507	3503
...	...	@@ -3522,18 +3518,17 @@
3522	3518	# CONFIG_USB_MDC800 is not set
3523	3519	# CONFIG_USB_MICROTEK is not set
3524	3520	# CONFIG_USBIP_CORE is not set
3525		-CONFIG_USB_MUSB_HDRC=m
3526		-# CONFIG_USB_MUSB_HOST is not set
3527		-# CONFIG_USB_MUSB_GADGET is not set
3528		-CONFIG_USB_MUSB_DUAL_ROLE=y
	3521	+CONFIG_USB_MUSB_HDRC=y
	3522	+CONFIG_USB_MUSB_HOST=y
3529	3523
3530	3524	#
3531	3525	# Platform Glue Layer
3532	3526	#
	3527	+# CONFIG_USB_MUSB_TUSB6010 is not set
3533	3528	CONFIG_USB_MUSB_OMAP2PLUS=m
3534	3529	CONFIG_USB_MUSB_AM35X=m
3535		-CONFIG_USB_MUSB_DSPS=m
3536		-CONFIG_USB_MUSB_AM335X_CHILD=m
	3530	+CONFIG_USB_MUSB_DSPS=y
	3531	+CONFIG_USB_MUSB_AM335X_CHILD=y
3537	3532	# CONFIG_USB_INVENTRA_DMA is not set
3538	3533	CONFIG_USB_TI_CPPI41_DMA=y
3539	3534	# CONFIG_MUSB_PIO_ONLY is not set
...	...	@@ -3559,7 +3554,57 @@
3559	3554	#
3560	3555	# USB port drivers
3561	3556	#
3562		-# CONFIG_USB_SERIAL is not set
	3557	+CONFIG_USB_SERIAL=m
	3558	+CONFIG_USB_SERIAL_GENERIC=y
	3559	+CONFIG_USB_SERIAL_SIMPLE=m
	3560	+# CONFIG_USB_SERIAL_AIRCABLE is not set
	3561	+# CONFIG_USB_SERIAL_ARK3116 is not set
	3562	+# CONFIG_USB_SERIAL_BELKIN is not set
	3563	+# CONFIG_USB_SERIAL_CH341 is not set
	3564	+# CONFIG_USB_SERIAL_WHITEHEAT is not set
	3565	+# CONFIG_USB_SERIAL_DIGI_ACCELEPORT is not set
	3566	+CONFIG_USB_SERIAL_CP210X=m
	3567	+# CONFIG_USB_SERIAL_CYPRESS_M8 is not set
	3568	+# CONFIG_USB_SERIAL_EMPEG is not set
	3569	+CONFIG_USB_SERIAL_FTDI_SIO=m
	3570	+# CONFIG_USB_SERIAL_VISOR is not set
	3571	+# CONFIG_USB_SERIAL_IPAQ is not set
	3572	+# CONFIG_USB_SERIAL_IR is not set
	3573	+# CONFIG_USB_SERIAL_EDGEPORT is not set
	3574	+# CONFIG_USB_SERIAL_EDGEPORT_TI is not set
	3575	+# CONFIG_USB_SERIAL_F81232 is not set
	3576	+# CONFIG_USB_SERIAL_GARMIN is not set
	3577	+# CONFIG_USB_SERIAL_IPW is not set
	3578	+# CONFIG_USB_SERIAL_IUU is not set
	3579	+# CONFIG_USB_SERIAL_KEYSPAN_PDA is not set
	3580	+# CONFIG_USB_SERIAL_KEYSPAN is not set
	3581	+# CONFIG_USB_SERIAL_KLSI is not set
	3582	+# CONFIG_USB_SERIAL_KOBIL_SCT is not set
	3583	+# CONFIG_USB_SERIAL_MCT_U232 is not set
	3584	+# CONFIG_USB_SERIAL_METRO is not set
	3585	+# CONFIG_USB_SERIAL_MOS7720 is not set
	3586	+# CONFIG_USB_SERIAL_MOS7840 is not set
	3587	+# CONFIG_USB_SERIAL_MXUPORT is not set
	3588	+# CONFIG_USB_SERIAL_NAVMAN is not set
	3589	+CONFIG_USB_SERIAL_PL2303=m
	3590	+# CONFIG_USB_SERIAL_OTI6858 is not set
	3591	+# CONFIG_USB_SERIAL_QCAUX is not set
	3592	+# CONFIG_USB_SERIAL_QUALCOMM is not set
	3593	+# CONFIG_USB_SERIAL_SPCP8X5 is not set
	3594	+# CONFIG_USB_SERIAL_SAFE is not set
	3595	+# CONFIG_USB_SERIAL_SIERRAWIRELESS is not set
	3596	+# CONFIG_USB_SERIAL_SYMBOL is not set
	3597	+# CONFIG_USB_SERIAL_TI is not set
	3598	+# CONFIG_USB_SERIAL_CYBERJACK is not set
	3599	+# CONFIG_USB_SERIAL_XIRCOM is not set
	3600	+# CONFIG_USB_SERIAL_OPTION is not set
	3601	+# CONFIG_USB_SERIAL_OMNINET is not set
	3602	+# CONFIG_USB_SERIAL_OPTICON is not set
	3603	+# CONFIG_USB_SERIAL_XSENS_MT is not set
	3604	+# CONFIG_USB_SERIAL_WISHBONE is not set
	3605	+# CONFIG_USB_SERIAL_SSU100 is not set
	3606	+# CONFIG_USB_SERIAL_QT2 is not set
	3607	+# CONFIG_USB_SERIAL_DEBUG is not set
3563	3608
3564	3609	#
3565	3610	# USB Miscellaneous drivers
...	...	@@ -356,7 +356,8 @@
356	356
357	357	err = sys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT, NULL);
358	358	if (err)
359		- printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
	359	+ printk(KERN_ERR "devtmpfs: error %i mounting on %s\n",
	360	+ err, mntdir);
360	361	else
361	362	printk(KERN_INFO "devtmpfs: mounted\n");
362	363	return err;
...	...	@@ -35,6 +35,7 @@
35	35	#include <linux/capability.h>
36	36	#include <linux/compat.h>
37	37	#include <linux/pm_runtime.h>
	38	+#include <linux/of.h>
38	39
39	40	#include <linux/mmc/ioctl.h>
40	41	#include <linux/mmc/card.h>
...	...	@@ -2090,6 +2091,7 @@
2090	2091	{
2091	2092	struct mmc_blk_data *md;
2092	2093	int devidx, ret;
	2094	+ int idx = 0;
2093	2095
2094	2096	devidx = find_first_zero_bit(dev_use, max_devices);
2095	2097	if (devidx >= max_devices)
...	...	@@ -2109,7 +2111,20 @@
2109	2111	* index anymore so we keep track of a name index.
2110	2112	*/
2111	2113	if (!subname) {
2112		- md->name_idx = find_first_zero_bit(name_use, max_devices);
	2114	+ if (card->dev.parent->parent->of_node)
	2115	+ idx = of_alias_get_id(card->dev.parent->parent->of_node,
	2116	+ "mmc");
	2117	+
	2118	+ if (idx < 0)
	2119	+ md->name_idx = find_first_zero_bit(name_use,
	2120	+ max_devices);
	2121	+ else {
	2122	+ if (test_bit(idx, name_use))
	2123	+ md->name_idx = find_first_zero_bit(name_use,
	2124	+ max_devices);
	2125	+ else
	2126	+ md->name_idx = (unsigned int)idx;
	2127	+ }
2113	2128	__set_bit(md->name_idx, name_use);
2114	2129	} else
2115	2130	md->name_idx = ((struct mmc_blk_data *)
...	...	@@ -594,7 +594,6 @@
594	594
595	595	mount_root();
596	596	out:
597		- devtmpfs_mount("dev");
598	597	sys_mount(".", "/", NULL, MS_MOVE, NULL);
599	598	sys_chroot(".");
600	599	}
601	600
...	...	@@ -609,8 +608,9 @@
609	608	if (test_and_set_bit(0, &once))
610	609	return ERR_PTR(-ENODEV);
611	610
612		- if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs)
	611	+ if (is_tmpfs)
613	612	fill = shmem_fill_super;
	613	+ printk(KERN_INFO "rootfs is %s\n", is_tmpfs ? "tmpfs" : "ramfs");
614	614
615	615	return mount_nodev(fs_type, flags, data, fill);
616	616	}
617	617
...	...	@@ -632,9 +632,8 @@
632	632	(!root_fs_names \|\| strstr(root_fs_names, "tmpfs"))) {
633	633	err = shmem_init();
634	634	is_tmpfs = true;
635		- } else {
	635	+ } else
636	636	err = init_ramfs_fs();
637		- }
638	637
639	638	if (err)
640	639	unregister_filesystem(&rootfs_fs_type);
...	...	@@ -1001,12 +1001,6 @@
1001	1001
1002	1002	do_basic_setup();
1003	1003
1004		- /* Open the /dev/console on the rootfs, this should never fail */
1005		- if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
1006		- pr_err("Warning: unable to open an initial console.\n");
1007		-
1008		- (void) sys_dup(0);
1009		- (void) sys_dup(0);
1010	1004	/*
1011	1005	* check if there is an early userspace init. If yes, let it do all
1012	1006	* the work
...	...	@@ -1018,7 +1012,16 @@
1018	1012	if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
1019	1013	ramdisk_execute_command = NULL;
1020	1014	prepare_namespace();
1021		- }
	1015	+ } else if (config_enabled(CONFIG_DEVTMPFS_MOUNT))
	1016	+ sys_mkdir("/dev", 0755);
	1017	+ devtmpfs_mount("dev");
	1018	+
	1019	+ /* Open the /dev/console on the rootfs, this should never fail */
	1020	+ if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
	1021	+ pr_err("Warning: unable to open an initial console.\n");
	1022	+
	1023	+ (void) sys_dup(0);
	1024	+ (void) sys_dup(0);
1022	1025
1023	1026	/*
1024	1027	* Ok, we have completed the initial bootup, and