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SubjectRe: [PATCH][linux-usb-devel] Early USB handoff
Date
From
>>   Here is slightly improved early USB legacy handoff patch for 2.4.27
>
>The usual caveat is how we all wait for this to go into 2.6.

Attached is a patch for 2.6.8.1

>> Handoff is under no-usb-legacy option.
>> +int disable_legacy_usb __initdata = 0;
>
>I think it's an unfortunate naming. When I was reading the patch, I got
>the meaning exactly backwards. I think that we should not be afraid
>of using something like "do handoff" or "do NOT do a handoff" in the
>documentation and flag names, for extra clarity.

Agree. Naming is a 'legacy' thing itself :) I changed flag name
to "usb-handoff" and "no-usb-handoff". Modified patch for 2.4.27
is attached as well.

Aleks.

diff -ruN linux-2.6.8.1/Documentation/kernel-parameters.txt linux-2.6.8.1-fix/Documentation/kernel-parameters.txt
--- linux-2.6.8.1/Documentation/kernel-parameters.txt 2004-08-14 03:56:24.000000000 -0700
+++ linux-2.6.8.1-fix/Documentation/kernel-parameters.txt 2004-08-16 18:15:48.000000000 -0700
@@ -757,6 +757,8 @@

nousb [USB] Disable the USB subsystem

+ no-usb-handoff Disable early USB BIOS -> OS handoff
+
nowb [ARM]

opl3= [HW,OSS]
@@ -1240,6 +1242,8 @@

uart6850= [HW,OSS]
Format: <io>,<irq>
+
+ usb-handoff Enable early USB BIOS -> OS handoff

video= [FB] Frame buffer configuration
See Documentation/fb/modedb.txt.
diff -ruN linux-2.6.8.1/drivers/pci/quirks.c linux-2.6.8.1-fix/drivers/pci/quirks.c
--- linux-2.6.8.1/drivers/pci/quirks.c 2004-08-14 03:54:47.000000000 -0700
+++ linux-2.6.8.1-fix/drivers/pci/quirks.c 2004-08-16 18:29:27.000000000 -0700
@@ -907,6 +907,228 @@
pciehp_msi_quirk = 1;
}

+
+#define UHCI_USBLEGSUP 0xc0 /* legacy support */
+#define UHCI_USBCMD 0 /* command register */
+#define UHCI_USBSTS 2 /* status register */
+#define UHCI_USBINTR 4 /* interrupt register */
+#define UHCI_USBLEGSUP_DEFAULT 0x2000 /* only PIRQ enable set */
+#define UHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
+#define UHCI_USBCMD_GRESET (1 << 2) /* Global reset */
+#define UHCI_USBCMD_CONFIGURE (1 << 6) /* config semaphore */
+#define UHCI_USBSTS_HALTED (1 << 5) /* HCHalted bit */
+
+#define OHCI_CONTROL 0x04
+#define OHCI_CMDSTATUS 0x08
+#define OHCI_INTRSTATUS 0x0c
+#define OHCI_INTRENABLE 0x10
+#define OHCI_INTRDISABLE 0x14
+#define OHCI_OCR (1 << 3) /* ownership change request */
+#define OHCI_CTRL_IR (1 << 8) /* interrupt routing */
+#define OHCI_INTR_OC (1 << 30) /* ownership change */
+
+#define EHCI_HCC_PARAMS 0x08 /* extended capabilities */
+#define EHCI_USBCMD 0 /* command register */
+#define EHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
+#define EHCI_USBSTS 4 /* status register */
+#define EHCI_USBSTS_HALTED (1 << 12) /* HCHalted bit */
+#define EHCI_USBINTR 8 /* interrupt register */
+#define EHCI_USBLEGSUP 0 /* legacy support register */
+#define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */
+#define EHCI_USBLEGSUP_OS (1 << 24) /* OS semaphore */
+#define EHCI_USBLEGCTLSTS 4 /* legacy support control/status */
+#define EHCI_USBLEGCTLSTS_SOOE (1 << 13) /* SMI on ownership change */
+
+int usb_early_handoff __initdata = 0;
+static int __init usb_handoff_early(char *str)
+{
+ usb_early_handoff = 1;
+ return 0;
+}
+static int __init usb_no_handoff(char *str)
+{
+ usb_early_handoff = 0;
+ return 0;
+}
+__setup("usb-handoff", usb_handoff_early);
+__setup("no-usb-handoff", usb_no_handoff);
+
+static void __init quirk_usb_disable_ehci(struct pci_dev *pdev)
+{
+ int wait_time, delta;
+ char *base, *op_reg_base;
+ u32 hcc_params, val, temp;
+ u8 cap_length;
+
+ base = ioremap_nocache(pci_resource_start(pdev, 0),
+ pci_resource_len(pdev, 0));
+ if (base == NULL) return;
+
+ cap_length = readb( base);
+ op_reg_base = base + cap_length;
+ hcc_params = readl( base + EHCI_HCC_PARAMS);
+ hcc_params = (hcc_params >> 8) & 0xff;
+ if ( hcc_params ) {
+ pci_read_config_dword( pdev,
+ hcc_params + EHCI_USBLEGSUP,
+ &val);
+ if ( ((val & 0xff) == 1) && (val & EHCI_USBLEGSUP_BIOS) ) {
+ /**
+ * Ok, BIOS is in smm mode, try to hand off...
+ */
+ pci_read_config_dword( pdev,
+ hcc_params + EHCI_USBLEGCTLSTS,
+ &temp);
+ pci_write_config_dword( pdev,
+ hcc_params + EHCI_USBLEGCTLSTS,
+ temp | EHCI_USBLEGCTLSTS_SOOE);
+ val |= EHCI_USBLEGSUP_OS;
+ pci_write_config_dword( pdev,
+ hcc_params + EHCI_USBLEGSUP,
+ val);
+
+ wait_time = 500;
+ do {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout( (HZ*10+999)/1000);
+ wait_time -= 10;
+ pci_read_config_dword( pdev,
+ hcc_params + EHCI_USBLEGSUP,
+ &val);
+ } while ( wait_time && (val & EHCI_USBLEGSUP_BIOS) );
+ if ( !wait_time ) {
+ /**
+ * well, possibly buggy BIOS...
+ */
+ printk( KERN_WARNING "EHCI early BIOS handoff failed (BIOS bug ?)\n");
+ pci_write_config_dword( pdev,
+ hcc_params + EHCI_USBLEGSUP,
+ EHCI_USBLEGSUP_OS);
+ pci_write_config_dword( pdev,
+ hcc_params + EHCI_USBLEGCTLSTS,
+ 0);
+ }
+ }
+ }
+
+ /**
+ * halt EHCI & disable its interrupts in any case
+ */
+ val = readl( op_reg_base + EHCI_USBSTS);
+ if ( (val & EHCI_USBSTS_HALTED) == 0 ) {
+ val = readl( op_reg_base + EHCI_USBCMD);
+ val &= ~EHCI_USBCMD_RUN;
+ writel( val, op_reg_base + EHCI_USBCMD);
+
+ wait_time = 2000;
+ delta = 100;
+ do {
+ writel( 0x3f, op_reg_base + EHCI_USBSTS);
+ udelay( delta);
+ wait_time -= delta;
+ val = readl( op_reg_base + EHCI_USBSTS);
+ if ( (val == ~(u32)0) ||
+ (val & EHCI_USBSTS_HALTED)) {
+ break;
+ }
+ } while ( wait_time > 0);
+ }
+ writel( 0, op_reg_base + EHCI_USBINTR);
+ writel( 0x3f, op_reg_base + EHCI_USBSTS);
+
+ iounmap(base);
+
+ return;
+}
+
+static void __init quirk_usb_early_handoff(struct pci_dev *pdev)
+{
+ int wait_time, delta;
+
+ if (!usb_early_handoff)
+ return;
+
+ if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x00)) { /* UHCI */
+ int i;
+ unsigned long base = 0;
+ u16 val, sts;
+
+ for (i = 0; i < PCI_ROM_RESOURCE; i++)
+ if ((pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
+ base = pci_resource_start(pdev, i);
+ break;
+ }
+
+ if (!base)
+ return;
+
+ /*
+ * stop controller
+ */
+ sts = inw(base + UHCI_USBSTS);
+ val = inw(base + UHCI_USBCMD);
+ val &= ~(u16)(UHCI_USBCMD_RUN | UHCI_USBCMD_CONFIGURE);
+ outw(val, base + UHCI_USBCMD);
+
+ /*
+ * wait while it stops if it was running
+ */
+ if ( (sts & UHCI_USBSTS_HALTED) == 0 )
+ {
+ wait_time = 1000;
+ delta = 100;
+
+ do {
+ outw(0x1f, base + UHCI_USBSTS);
+ udelay( delta);
+ wait_time -= delta;
+ val = inw(base + UHCI_USBSTS);
+ if (val & UHCI_USBSTS_HALTED)
+ break;
+ } while ( wait_time > 0 );
+ }
+
+ /*
+ * disable interrupts & legacy support
+ */
+ outw(0, base + UHCI_USBINTR);
+ outw(0x1f, base + UHCI_USBSTS);
+ pci_read_config_word(pdev, UHCI_USBLEGSUP, &val);
+ if ( val & 0xbf )
+ pci_write_config_word(pdev, UHCI_USBLEGSUP,
+ UHCI_USBLEGSUP_DEFAULT);
+
+ } else if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x10)) { /* OHCI */
+ char *base = ioremap_nocache(pci_resource_start(pdev, 0),
+ pci_resource_len(pdev, 0));
+ if (base == NULL) return;
+
+ if (readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
+ wait_time = 500; /* 0.5 seconds */
+ writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
+ writel(OHCI_OCR, base + OHCI_CMDSTATUS);
+ while ( (wait_time > 0) &&
+ readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
+ wait_time -= 10;
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout( (HZ*10 + 999) / 1000);
+ }
+ }
+
+ /*
+ * disable interrupts
+ */
+ writel(~(u32)0, base + OHCI_INTRDISABLE);
+ writel(~(u32)0, base + OHCI_INTRSTATUS);
+
+ iounmap(base);
+ } else if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x20)) { /* EHCI */
+ quirk_usb_disable_ehci( pdev);
+ }
+
+ return;
+}
+
/*
* The main table of quirks.
*
@@ -1039,6 +1261,7 @@
#endif /* CONFIG_SCSI_SATA */

{ PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SMCH, quirk_pciehp_msi },
+ { PCI_FIXUP_FINAL, PCI_ANY_ID, PCI_ANY_ID, quirk_usb_early_handoff },

{ 0 }
};
diff -ruN linux-2.6.8.1/include/asm-i386/mach-summit/mach_mpparse.h linux-2.6.8.1-fix/include/asm-i386/mach-summit/mach_mpparse.h
--- linux-2.6.8.1/include/asm-i386/mach-summit/mach_mpparse.h 2004-08-14 03:55:20.000000000 -0700
+++ linux-2.6.8.1-fix/include/asm-i386/mach-summit/mach_mpparse.h 2004-08-16 18:19:08.000000000 -0700
@@ -22,6 +22,7 @@
{
}

+extern int usb_early_handoff;
static inline int mps_oem_check(struct mp_config_table *mpc, char *oem,
char *productid)
{
@@ -31,6 +32,7 @@
|| !strncmp(productid, "RUTHLESS SMP", 12))){
use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
+ usb_early_handoff = 1;
return 1;
}
return 0;
@@ -44,6 +46,7 @@
|| !strncmp(oem_table_id, "EXA", 3))){
use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
+ usb_early_handoff = 1;
return 1;
}
return 0;diff -ruN linux-2.4.27/Documentation/kernel-parameters.txt linux-2.4.27-fix/Documentation/kernel-parameters.txt
--- linux-2.4.27/Documentation/kernel-parameters.txt 2004-08-07 16:26:04.000000000 -0700
+++ linux-2.4.27-fix/Documentation/kernel-parameters.txt 2004-08-16 18:52:52.000000000 -0700
@@ -441,6 +441,8 @@

notsc [BUGS=IA-32] Disable Time Stamp Counter

+ no-usb-handoff [HW] Disable early USB BIOS -> OS handoff
+
nowb [ARM]

opl3= [HW,SOUND]
@@ -635,7 +637,9 @@
uart6850= [HW,SOUND]

usbfix [BUGS=IA-64]
-
+
+ usb-handoff [HW] Enable early USB BIOS -> OS handoff
+
video= [FB] frame buffer configuration.

vga= [BOOT] on ix386, select a particular video mode
diff -ruN linux-2.4.27/drivers/pci/quirks.c linux-2.4.27-fix/drivers/pci/quirks.c
--- linux-2.4.27/drivers/pci/quirks.c 2004-08-07 16:26:05.000000000 -0700
+++ linux-2.4.27-fix/drivers/pci/quirks.c 2004-08-16 18:55:53.000000000 -0700
@@ -726,6 +726,228 @@
pciehp_msi_quirk = 1;
}

+
+#define UHCI_USBLEGSUP 0xc0 /* legacy support */
+#define UHCI_USBCMD 0 /* command register */
+#define UHCI_USBSTS 2 /* status register */
+#define UHCI_USBINTR 4 /* interrupt register */
+#define UHCI_USBLEGSUP_DEFAULT 0x2000 /* only PIRQ enable set */
+#define UHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
+#define UHCI_USBCMD_GRESET (1 << 2) /* Global reset */
+#define UHCI_USBCMD_CONFIGURE (1 << 6) /* config semaphore */
+#define UHCI_USBSTS_HALTED (1 << 5) /* HCHalted bit */
+
+#define OHCI_CONTROL 0x04
+#define OHCI_CMDSTATUS 0x08
+#define OHCI_INTRSTATUS 0x0c
+#define OHCI_INTRENABLE 0x10
+#define OHCI_INTRDISABLE 0x14
+#define OHCI_OCR (1 << 3) /* ownership change request */
+#define OHCI_CTRL_IR (1 << 8) /* interrupt routing */
+#define OHCI_INTR_OC (1 << 30) /* ownership change */
+
+#define EHCI_HCC_PARAMS 0x08 /* extended capabilities */
+#define EHCI_USBCMD 0 /* command register */
+#define EHCI_USBCMD_RUN (1 << 0) /* RUN/STOP bit */
+#define EHCI_USBSTS 4 /* status register */
+#define EHCI_USBSTS_HALTED (1 << 12) /* HCHalted bit */
+#define EHCI_USBINTR 8 /* interrupt register */
+#define EHCI_USBLEGSUP 0 /* legacy support register */
+#define EHCI_USBLEGSUP_BIOS (1 << 16) /* BIOS semaphore */
+#define EHCI_USBLEGSUP_OS (1 << 24) /* OS semaphore */
+#define EHCI_USBLEGCTLSTS 4 /* legacy support control/status */
+#define EHCI_USBLEGCTLSTS_SOOE (1 << 13) /* SMI on ownership change */
+
+int usb_early_handoff __initdata = 0;
+static int __init usb_handoff_early(char *str)
+{
+ usb_early_handoff = 1;
+ return 0;
+}
+static int __init usb_no_handoff(char *str)
+{
+ usb_early_handoff = 0;
+ return 0;
+}
+__setup("usb-handoff", usb_handoff_early);
+__setup("no-usb-handoff", usb_no_handoff);
+
+static void __init quirk_usb_disable_ehci(struct pci_dev *pdev)
+{
+ int wait_time, delta;
+ char *base, *op_reg_base;
+ u32 hcc_params, val, temp;
+ u8 cap_length;
+
+ base = ioremap_nocache(pci_resource_start(pdev, 0),
+ pci_resource_len(pdev, 0));
+ if (base == NULL) return;
+
+ cap_length = readb( base);
+ op_reg_base = base + cap_length;
+ hcc_params = readl( base + EHCI_HCC_PARAMS);
+ hcc_params = (hcc_params >> 8) & 0xff;
+ if ( hcc_params ) {
+ pci_read_config_dword( pdev,
+ hcc_params + EHCI_USBLEGSUP,
+ &val);
+ if ( ((val & 0xff) == 1) && (val & EHCI_USBLEGSUP_BIOS) ) {
+ /**
+ * Ok, BIOS is in smm mode, try to hand off...
+ */
+ pci_read_config_dword( pdev,
+ hcc_params + EHCI_USBLEGCTLSTS,
+ &temp);
+ pci_write_config_dword( pdev,
+ hcc_params + EHCI_USBLEGCTLSTS,
+ temp | EHCI_USBLEGCTLSTS_SOOE);
+ val |= EHCI_USBLEGSUP_OS;
+ pci_write_config_dword( pdev,
+ hcc_params + EHCI_USBLEGSUP,
+ val);
+
+ wait_time = 500;
+ do {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout( (HZ*10+999)/1000);
+ wait_time -= 10;
+ pci_read_config_dword( pdev,
+ hcc_params + EHCI_USBLEGSUP,
+ &val);
+ } while ( wait_time && (val & EHCI_USBLEGSUP_BIOS) );
+ if ( !wait_time ) {
+ /**
+ * well, possibly buggy BIOS...
+ */
+ printk( KERN_WARNING "EHCI early BIOS handoff failed (BIOS bug ?)\n");
+ pci_write_config_dword( pdev,
+ hcc_params + EHCI_USBLEGSUP,
+ EHCI_USBLEGSUP_OS);
+ pci_write_config_dword( pdev,
+ hcc_params + EHCI_USBLEGCTLSTS,
+ 0);
+ }
+ }
+ }
+
+ /**
+ * halt EHCI & disable its interrupts in any case
+ */
+ val = readl( op_reg_base + EHCI_USBSTS);
+ if ( (val & EHCI_USBSTS_HALTED) == 0 ) {
+ val = readl( op_reg_base + EHCI_USBCMD);
+ val &= ~EHCI_USBCMD_RUN;
+ writel( val, op_reg_base + EHCI_USBCMD);
+
+ wait_time = 2000;
+ delta = 100;
+ do {
+ writel( 0x3f, op_reg_base + EHCI_USBSTS);
+ udelay( delta);
+ wait_time -= delta;
+ val = readl( op_reg_base + EHCI_USBSTS);
+ if ( (val == ~(u32)0) ||
+ (val & EHCI_USBSTS_HALTED)) {
+ break;
+ }
+ } while ( wait_time > 0);
+ }
+ writel( 0, op_reg_base + EHCI_USBINTR);
+ writel( 0x3f, op_reg_base + EHCI_USBSTS);
+
+ iounmap(base);
+
+ return;
+}
+
+static void __init quirk_usb_early_handoff(struct pci_dev *pdev)
+{
+ int wait_time, delta;
+
+ if (!usb_early_handoff)
+ return;
+
+ if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x00)) { /* UHCI */
+ int i;
+ unsigned long base = 0;
+ u16 val, sts;
+
+ for (i = 0; i < PCI_ROM_RESOURCE; i++)
+ if ((pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
+ base = pci_resource_start(pdev, i);
+ break;
+ }
+
+ if (!base)
+ return;
+
+ /*
+ * stop controller
+ */
+ sts = inw(base + UHCI_USBSTS);
+ val = inw(base + UHCI_USBCMD);
+ val &= ~(u16)(UHCI_USBCMD_RUN | UHCI_USBCMD_CONFIGURE);
+ outw(val, base + UHCI_USBCMD);
+
+ /*
+ * wait while it stops if it was running
+ */
+ if ( (sts & UHCI_USBSTS_HALTED) == 0 )
+ {
+ wait_time = 1000;
+ delta = 100;
+
+ do {
+ outw(0x1f, base + UHCI_USBSTS);
+ udelay( delta);
+ wait_time -= delta;
+ val = inw(base + UHCI_USBSTS);
+ if (val & UHCI_USBSTS_HALTED)
+ break;
+ } while ( wait_time > 0 );
+ }
+
+ /*
+ * disable interrupts & legacy support
+ */
+ outw(0, base + UHCI_USBINTR);
+ outw(0x1f, base + UHCI_USBSTS);
+ pci_read_config_word(pdev, UHCI_USBLEGSUP, &val);
+ if ( val & 0xbf )
+ pci_write_config_word(pdev, UHCI_USBLEGSUP,
+ UHCI_USBLEGSUP_DEFAULT);
+
+ } else if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x10)) { /* OHCI */
+ char *base = ioremap_nocache(pci_resource_start(pdev, 0),
+ pci_resource_len(pdev, 0));
+ if (base == NULL) return;
+
+ if (readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
+ wait_time = 500; /* 0.5 seconds */
+ writel(OHCI_INTR_OC, base + OHCI_INTRENABLE);
+ writel(OHCI_OCR, base + OHCI_CMDSTATUS);
+ while ( (wait_time > 0) &&
+ readl(base + OHCI_CONTROL) & OHCI_CTRL_IR) {
+ wait_time -= 10;
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout( (HZ*10 + 999) / 1000);
+ }
+ }
+
+ /*
+ * disable interrupts
+ */
+ writel(~(u32)0, base + OHCI_INTRDISABLE);
+ writel(~(u32)0, base + OHCI_INTRSTATUS);
+
+ iounmap(base);
+ } else if (pdev->class == ((PCI_CLASS_SERIAL_USB << 8) | 0x20)) { /* EHCI */
+ quirk_usb_disable_ehci( pdev);
+ }
+
+ return;
+}
+
/*
* The main table of quirks.
*/
@@ -816,6 +1038,7 @@
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, asus_hides_smbus_lpc },

{ PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SMCH, quirk_pciehp_msi },
+ { PCI_FIXUP_FINAL, PCI_ANY_ID, PCI_ANY_ID, quirk_usb_early_handoff },

{ 0 }
};
diff -ruN linux-2.4.27/include/asm-i386/smpboot.h linux-2.4.27-fix/include/asm-i386/smpboot.h
--- linux-2.4.27/include/asm-i386/smpboot.h 2004-08-07 16:26:06.000000000 -0700
+++ linux-2.4.27-fix/include/asm-i386/smpboot.h 2004-08-16 18:54:13.000000000 -0700
@@ -15,6 +15,7 @@
extern unsigned char int_delivery_mode;
extern unsigned int int_dest_addr_mode;
extern int cyclone_setup(char*);
+extern int usb_early_handoff;

static inline void detect_clustered_apic(char* oem, char* prod)
{
@@ -29,6 +30,7 @@
esr_disable = 1;
/*Start cyclone clock*/
cyclone_setup(0);
+ usb_early_handoff = 1;
/* check for ACPI tables */
} else if (!strncmp(oem, "IBM", 3) &&
(!strncmp(prod, "SERVIGIL", 8) ||
@@ -41,6 +43,7 @@
esr_disable = 1;
/*Start cyclone clock*/
cyclone_setup(0);
+ usb_early_handoff = 1;
} else if (!strncmp(oem, "IBM NUMA", 8)){
clustered_apic_mode = CLUSTERED_APIC_NUMAQ;
apic_broadcast_id = APIC_BROADCAST_ID_APIC;
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