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SubjectRe: [lm-sensors] 2.6.15: lm90 0-004c: Register 0x13 read failed (-1)
Hello all,

>
> this appears simply a probing for non-existent i2c ports (correct me if I am
> wrong) presumably by eeprom driver.

yes I think you are right. (ADD/2 is the address of chip, that it tries to access)

> Second block are errors from lm90 for different registers:
>
> Jan 15 22:24:02 cooker kernel: i2c_adapter i2c-0: Transaction (pre): STS=04,
> TYP=10, CMD=01, ADD=99, DAT0=a0, DAT1=10
> Jan 15 22:24:02 cooker kernel: i2c_adapter i2c-0: Transaction (post): STS=14,
> TYP=10, CMD=01, ADD=99, DAT0=29, DAT1=10
> Jan 15 22:24:02 cooker kernel: i2c_adapter i2c-0: Transaction (pre): STS=04,
> TYP=10, CMD=08, ADD=98, DAT0=29, DAT1=10
> Jan 15 22:24:02 cooker kernel: i2c_adapter i2c-0: Error: command never
> completed
> Jan 15 22:24:02 cooker kernel: i2c_adapter i2c-0: Transaction (post): STS=04,
> TYP=10, CMD=08, ADD=98, DAT0=29, DAT1=10
> Jan 15 22:24:02 cooker kernel: lm90 0-004c: Register 0x8 read failed (-1)
> Jan 15 22:24:02 cooker kernel: i2c_adapter i2c-0: Transaction (pre): STS=04,
> TYP=10, CMD=07, ADD=98, DAT0=29, DAT1=10
> Jan 15 22:24:02 cooker kernel: i2c_adapter i2c-0: Transaction (post): STS=14,
> TYP=10, CMD=07, ADD=98, DAT0=29, DAT1=10
>
> Here I do not see SMBus errors - it appears really that i2c device did not
> respond. OTOH interesting is that there is no timeout. Apparently command
> completed without setting DONE bit. As I have zero knowledge about hardware I
> cannot interpret it. Next driver resets SMBus and it works for some time
> again. Judging by comments in source, it apprently signifies hung ali1535,
> not external i2c device (it is using KILL, and "this doesn't seem to clear
> the controller if an external device is hung")

Well it seems this ali 15x3 has maybe same hardware bug? It was mentioned already here:
http://www2.lm-sensors.nu/~lm78/readticket.cgi?ticket=2030

> In the log below you can see that the ALI15X3 chip seems to keep in idle-state
> without reporting "done", but it does not turn in "busy" state. I patched the
> driver to do the reset procedure (with ALI15X3_T_OUT) after the error, but
> afterwards, the chip turns to "busy" state until next reboot.

And it continued:

http://lists.lm-sensors.org/pipermail/lm-sensors/2005-October/013808.html

I asked for a patch and what I have received like a month after is patch that works for them:

> Dear Rudolf,
>
> unfortunately i do not have cvs installed on my machine. I hope it's okay if
> i send you the complete patched module (the only file i changed was the
> i2c-ali15x3.c) so you can do the patch yourself. Since i'm not a experienced
> driver developer i do not know what you ment with your last sentence and i
> did not find any remarks on the website.
>
> However, feel free to contact me if you have still any questions.
>
> This version works fine and without any problems over many days in our test
> system.
>
> Regards,
> Claudio Klingler

I'm putting it into attachment. (this is against the lmsensors CVS so 2.4 driver)

Since I dont own the motherboard with this chip (nor the datasheet) and the resulting driver was hard to read I just left this issue.
I hope it can help now.

Regards
Rudolf
/*
ali15x3.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1999 Frodo Looijaard <frodol@dds.nl> and
Philip Edelbrock <phil@netroedge.com> and
Mark D. Studebaker <mdsxyz123@yahoo.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
This is the driver for the SMB Host controller on
Acer Labs Inc. (ALI) M1541 and M1543C South Bridges.
The M1543C is a South bridge for desktop systems.
The M1533 is a South bridge for portable systems.
They are part of the following ALI chipsets:
"Aladdin Pro 2": Includes the M1621 Slot 1 North bridge
with AGP and 100MHz CPU Front Side bus
"Aladdin V": Includes the M1541 Socket 7 North bridge
with AGP and 100MHz CPU Front Side bus
"Aladdin IV": Includes the M1541 Socket 7 North bridge
with host bus up to 83.3 MHz.
For an overview of these chips see http://www.acerlabs.com

The M1533/M1543C devices appear as FOUR separate devices
on the PCI bus. An output of lspci will show something similar
to the following:

00:02.0 USB Controller: Acer Laboratories Inc. M5237
00:03.0 Bridge: Acer Laboratories Inc. M7101
00:07.0 ISA bridge: Acer Laboratories Inc. M1533
00:0f.0 IDE interface: Acer Laboratories Inc. M5229

The SMB controller is part of the 7101 device, which is an
ACPI-compliant Power Management Unit (PMU).

The whole 7101 device has to be enabled for the SMB to work.
You can't just enable the SMB alone.
The SMB and the ACPI have separate I/O spaces.
We make sure that the SMB is enabled. We leave the ACPI alone.

This driver controls the SMB Host only.
The SMB Slave controller on the M15X3 is not enabled.

This driver does not use interrupts.
*/

/* Note: we assume there can only be one ALI15X3, with one SMBus interface */
/* #define DEBUG 1 */
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <asm/io.h>
#include "version.h"
#include "sensors_compat.h"

/* ALI15X3 SMBus address offsets */
#define SMBHSTSTS (0 + ali15x3_smba)
#define SMBHSTCNT (1 + ali15x3_smba)
#define SMBHSTSTART (2 + ali15x3_smba)
#define SMBHSTCMD (7 + ali15x3_smba)
#define SMBHSTADD (3 + ali15x3_smba)
#define SMBHSTDAT0 (4 + ali15x3_smba)
#define SMBHSTDAT1 (5 + ali15x3_smba)
#define SMBBLKDAT (6 + ali15x3_smba)
/* PCI Address Constants */
#define SMBCOM 0x004
#define SMBBA 0x014
#define SMBATPC 0x05B /* used to unlock xxxBA registers */
#define SMBHSTCFG 0x0E0
#define SMBSLVC 0x0E1
#define SMBCLK 0x0E2
#define SMBREV 0x008
/* Other settings */
#define MAX_TIMEOUT 50 /* times 1/100 sec */
#define MAX_RETRIES 3 /* maximum reset retries */
#define ALI15X3_SMB_IOSIZE 32
/* this is what the Award 1004 BIOS sets them to on a ASUS P5A MB.
We don't use these here. If the bases aren't set to some value we
tell user to upgrade BIOS and we fail.
*/
#define ALI15X3_SMB_DEFAULTBASE 0xE800
/* ALI15X3 address lock bits */
#define ALI15X3_LOCK 0x06
/* ALI15X3 command constants */
#define ALI15X3_ABORT 0x02
#define ALI15X3_T_OUT 0x04
#define ALI15X3_QUICK 0x00
#define ALI15X3_BYTE 0x10
#define ALI15X3_BYTE_DATA 0x20
#define ALI15X3_WORD_DATA 0x30
#define ALI15X3_BLOCK_DATA 0x40
#define ALI15X3_BLOCK_CLR 0x80
/* ALI15X3 status register bits */
#define ALI15X3_STS_IDLE 0x04
#define ALI15X3_STS_BUSY 0x08
#define ALI15X3_STS_DONE 0x10
#define ALI15X3_STS_DEV 0x20 /* device error */
#define ALI15X3_STS_COLL 0x40 /* collision or no response */
#define ALI15X3_STS_TERM 0x80 /* terminated by abort */
#define ALI15X3_STS_ERR 0xE0 /* all the bad error bits */

#define E_TIMEOUT -2

#define PRINTK(fmt, arg...) {;}

/* If force_addr is set to anything different from 0, we forcibly enable
the device at the given address. */
static int force_addr = 0;
MODULE_PARM(force_addr, "i");
MODULE_PARM_DESC(force_addr,
"Initialize the base address of the i2c controller");
static unsigned short ali15x3_smba = 0;

static int ali15x3_setup(struct pci_dev *ALI15X3_dev)
{
u16 a;
unsigned char temp;
/* Check the following things:
- SMB I/O address is initialized
- Device is enabled
- We can use the addresses
*/
/* Unlock the register.
The data sheet says that the address registers are read-only
if the lock bits are 1, but in fact the address registers
are zero unless you clear the lock bits.
*/
pci_read_config_byte(ALI15X3_dev, SMBATPC, &temp);
if (temp & ALI15X3_LOCK) {
temp &= ~ALI15X3_LOCK;
pci_write_config_byte(ALI15X3_dev, SMBATPC, temp);
}
/* Determine the address of the SMBus area */
pci_read_config_word(ALI15X3_dev, SMBBA, &ali15x3_smba);
ali15x3_smba &= (0xffff & ~(ALI15X3_SMB_IOSIZE - 1));
if (ali15x3_smba == 0 && force_addr == 0) {
dev_err(ALI15X3_dev, "ALI15X3_smb region uninitialized "
"- upgrade BIOS or use force_addr=0xaddr\n");
return -ENODEV;
}
if(force_addr)
ali15x3_smba = force_addr & ~(ALI15X3_SMB_IOSIZE - 1);
if (!request_region(ali15x3_smba, ALI15X3_SMB_IOSIZE, "ali15x3-smb")) {
dev_err(ALI15X3_dev,
"ALI15X3_smb region 0x%x already in use!\n",
ali15x3_smba);
return -ENODEV;
}
if(force_addr) {
dev_info(ALI15X3_dev, "forcing ISA address 0x%04X\n",
ali15x3_smba);
if (PCIBIOS_SUCCESSFUL !=
pci_write_config_word(ALI15X3_dev, SMBBA, ali15x3_smba))
return -ENODEV;
if (PCIBIOS_SUCCESSFUL !=
pci_read_config_word(ALI15X3_dev, SMBBA, &a))
return -ENODEV;
if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) {
/* make sure it works */
dev_err(ALI15X3_dev,
"force address failed - not supported?\n");
return -ENODEV;
}
}
/* check if whole device is enabled */
pci_read_config_byte(ALI15X3_dev, SMBCOM, &temp);
if ((temp & 1) == 0) {
dev_info(ALI15X3_dev, "enabling SMBus device\n");
pci_write_config_byte(ALI15X3_dev, SMBCOM, temp | 0x01);
}
/* Is SMB Host controller enabled? */
pci_read_config_byte(ALI15X3_dev, SMBHSTCFG, &temp);
if ((temp & 1) == 0) {
dev_info(ALI15X3_dev, "enabling SMBus controller\n");
pci_write_config_byte(ALI15X3_dev, SMBHSTCFG, temp | 0x01);
}
/* set SMB clock to 74KHz as recommended in data sheet */
/* ??CK Evtl. verursacht das die Bus timeouts, deshalb*/
/* belassen wir es mal bei den Default-Einstellungen */
pci_write_config_byte(ALI15X3_dev, SMBCLK, 0x20);
/*
The interrupt routing for SMB is set up in register 0x77 in the
1533 ISA Bridge device, NOT in the 7101 device.
Don't bother with finding the 1533 device and reading the register.
if ((....... & 0x0F) == 1)
dev_dbg(ALI15X3_dev, "ALI15X3 using Interrupt 9 for SMBus.\n");
*/
pci_read_config_byte(ALI15X3_dev, SMBREV, &temp);
dev_dbg(ALI15X3_dev, "SMBREV = 0x%X\n", temp);
dev_dbg(ALI15X3_dev, "iALI15X3_smba = 0x%X\n", ali15x3_smba);
return 0;
}
static int ali15x3_wait_for_idle (struct i2c_adapter *adap)
{
int temp;
int timeout;
/* make sure SMBus is idle */
temp = inb_p(SMBHSTSTS);
for (timeout = 0;
(timeout < MAX_TIMEOUT) && !(temp & ALI15X3_STS_IDLE);
timeout++) {
i2c_delay(1);
temp = inb_p(SMBHSTSTS);
}
if (timeout >= MAX_TIMEOUT) {
dev_err(adap, "Idle wait Timeout! STS=0x%02x\n", temp);
return -1;
}
return 0;
}
static int ali15x3_do_reset (struct i2c_adapter *adap)
{
int temp;
/*
If the host controller is still busy, it may have timed out in the
previous transaction, resulting in a "SMBus Timeout" Dev.
I've tried the following to reset a stuck busy bit.
1. Reset the controller with an ABORT command.
(this doesn't seem to clear the controller if an external
device is hung)
2. Reset the controller and the other SMBus devices with a
T_OUT command. (this clears the host busy bit if an
external device is hung, but it comes back upon a new access
to a device)
3. Disable and reenable the controller in SMBHSTCFG
Worst case, nothing seems to work except power reset.
*/
/* Abort - reset the host controller */
/*
Try resetting entire SMB bus, including other devices -
This may not work either - it clears the BUSY bit but
then the BUSY bit may come back on when you try and use the chip again.
If that's the case you are stuck.
*/
dev_dbg(adap, "Resetting entire SMB Bus (abort) to "
"clear busy condition (%02x)\n", temp);
outb_p(ALI15X3_T_OUT, SMBHSTCNT);
i2c_delay(1);
temp = inb_p(SMBHSTSTS);
dev_dbg(adap, "Status after reset: %02x\n", temp);
/* now check the error bits and the busy bit */
if (temp & (ALI15X3_STS_ERR | ALI15X3_STS_BUSY)) {
/* do a clear-on-write */
dev_dbg(adap, "Doing a clear on write\n");
outb_p(0xFF, SMBHSTSTS);
if ((temp = inb_p(SMBHSTSTS)) &
(ALI15X3_STS_ERR | ALI15X3_STS_BUSY)) {
/* this is probably going to be correctable only by a power reset
as one of the bits now appears to be stuck */
/* This may be a bus or device with electrical problems. */
dev_err(adap, "SMBus reset failed! (0x%02x) - "
"controller or device on bus is probably hung\n",
temp);
return -1;
}
} else {
/* check and clear done bit */
if (temp & ALI15X3_STS_DONE) {
dev_info(adap, "Resetting done flag\n");
outb_p(temp, SMBHSTSTS);
}
}
return 0;
}
/* Another internally used function */
static int ali15x3_transaction(struct i2c_adapter *adap)
{
int temp;
int result = 0;
int timeout = 0;
/*dev_dbg(adap, "Transaction (pre): STS=%02x, CNT=%02x, CMD=%02x, "
"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTSTS),
inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD),
inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); */
/* start the transaction by writing anything to the start register */
outb_p(0xFF, SMBHSTSTART);
/* We will always wait for a fraction of a second! */
timeout = 0;
do {
i2c_delay(1);
temp = inb_p(SMBHSTSTS);
} while ((!(temp & (ALI15X3_STS_ERR | ALI15X3_STS_DONE)))
&& (timeout++ < MAX_TIMEOUT));
/* If the SMBus is still busy, we give up */
if (timeout >= MAX_TIMEOUT) {
//dev_warn(adap, "SMBus Timeout, doing a reset\n");
ali15x3_do_reset(adap);
return E_TIMEOUT;
}
if (temp & ALI15X3_STS_TERM) {
result = -1;
//dev_dbg(adap, "Error: Failed bus transaction\n");
}
/*
Unfortunately the ALI SMB controller maps "no response" and "bus
collision" into a single bit. No reponse is the usual case so don't
do a PRINTK.
This means that bus collisions go unreported.
*/
if (temp & ALI15X3_STS_COLL) {
result = -1;
/*dev_dbg(adap,
"Error: no response or bus collision ADD=%02x\n",
inb_p(SMBHSTADD)); */
}
/* haven't ever seen this */
if (temp & ALI15X3_STS_DEV) {
result = -1;
dev_err(adap, "Error: device error\n");
}
dev_dbg(adap, "Transaction (post): STS=%02x, CNT=%02x, CMD=%02x, "
"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTSTS),
inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD),
inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
return result;
}
/* Return -1 on error. */
static s32 ali15x3_access(struct i2c_adapter * adap, u16 addr,
unsigned short flags, char read_write, u8 command,
int size, union i2c_smbus_data * data)
{
int i, len;
int retries;
int tsize;
for (retries = 0; retries < MAX_RETRIES; retries++)
{
/* clear all the bits (clear-on-write) */
outb_p(0xFF, SMBHSTSTS);
/* ali15x3_do_reset(adap); */
ali15x3_wait_for_idle(adap);
switch (size) {
case I2C_SMBUS_QUICK:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
tsize = ALI15X3_QUICK;
break;
case I2C_SMBUS_BYTE:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
if (read_write == I2C_SMBUS_WRITE)
outb_p(command, SMBHSTCMD);
tsize = ALI15X3_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
outb_p(command, SMBHSTCMD);
if (read_write == I2C_SMBUS_WRITE)
outb_p(data->byte, SMBHSTDAT0);
tsize = ALI15X3_BYTE_DATA;
break;
case I2C_SMBUS_WORD_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
outb_p(command, SMBHSTCMD);
if (read_write == I2C_SMBUS_WRITE) {
outb_p(data->word & 0xff, SMBHSTDAT0);
outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
}
tsize = ALI15X3_WORD_DATA;
break;
case I2C_SMBUS_BLOCK_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD);
outb_p(command, SMBHSTCMD);
if (read_write == I2C_SMBUS_WRITE) {
len = data->block[0];
if (len < 0) {
len = 0;
data->block[0] = len;
}
if (len > 32) {
len = 32;
data->block[0] = len;
}
outb_p(len, SMBHSTDAT0);
/* Reset SMBBLKDAT */
outb_p(inb_p(SMBHSTCNT) | ALI15X3_BLOCK_CLR, SMBHSTCNT);
for (i = 1; i <= len; i++)
outb_p(data->block[i], SMBBLKDAT);
}
tsize = ALI15X3_BLOCK_DATA;
break;
default:
PRINTK
(KERN_WARNING "i2c-ali15x3.o: Unsupported transaction %d\n", size);
return -1;
}
outb_p(tsize, SMBHSTCNT); /* output command */
switch (ali15x3_transaction(adap))
{
case 0:
break; /* no error, continue */
case E_TIMEOUT:
PRINTK(KERN_INFO "i2c-ali15x3.o: timeout, doing a retry (%d)\n", retries);
continue;
default:
return -1;
}
break;
}
if (retries == MAX_RETRIES)
{
PRINTK(KERN_WARNING "i2c-ali15x3.o: transaction failed, maximum retries reached\n");
return -1;
}
if ((read_write == I2C_SMBUS_WRITE) || (size == ALI15X3_QUICK))
return 0;

switch (tsize) {
case ALI15X3_BYTE: /* Result put in SMBHSTDAT0 */
data->byte = inb_p(SMBHSTDAT0);
break;
case ALI15X3_BYTE_DATA:
data->byte = inb_p(SMBHSTDAT0);
break;
case ALI15X3_WORD_DATA:
data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
break;
case ALI15X3_BLOCK_DATA:
len = inb_p(SMBHSTDAT0);
if (len > 32)
len = 32;
data->block[0] = len;
/* Reset SMBBLKDAT */
outb_p(inb_p(SMBHSTCNT) | ALI15X3_BLOCK_CLR, SMBHSTCNT);
for (i = 1; i <= data->block[0]; i++) {
data->block[i] = inb_p(SMBBLKDAT);
dev_dbg(adap, "Blk: len=%d, i=%d, data=%02x\n",
len, i, data->block[i]);
}
break;
}
return 0;
}
static void ali15x3_inc(struct i2c_adapter *adapter)
{
#ifdef MODULE
MOD_INC_USE_COUNT;
#endif
}
static void ali15x3_dec(struct i2c_adapter *adapter)
{
#ifdef MODULE
MOD_DEC_USE_COUNT;
#endif
}
static u32 ali15x3_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA;
}
static struct i2c_algorithm smbus_algorithm = {
.name = "Non-I2C SMBus adapter",
.id = I2C_ALGO_SMBUS,
.smbus_xfer = ali15x3_access,
.functionality = ali15x3_func,
};
static struct i2c_adapter ali15x3_adapter = {
.id = I2C_ALGO_SMBUS | I2C_HW_SMBUS_ALI15X3,
.algo = &smbus_algorithm,
.name = "unset",
.inc_use = ali15x3_inc,
.dec_use = ali15x3_dec,
};
static struct pci_device_id ali15x3_ids[] __devinitdata = {
{
.vendor = PCI_VENDOR_ID_AL,
.device = PCI_DEVICE_ID_AL_M7101,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ 0, }
};
static int __devinit ali15x3_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
if (ali15x3_setup(dev)) {
dev_err(dev,
"ALI15X3 not detected, module not inserted.\n");
return -ENODEV;
}
snprintf(ali15x3_adapter.name, 32,
"SMBus ALI15X3 adapter at %04x", ali15x3_smba);
return i2c_add_adapter(&ali15x3_adapter);
}
static void __devexit ali15x3_remove(struct pci_dev *dev)
{
i2c_del_adapter(&ali15x3_adapter);
release_region(ali15x3_smba, ALI15X3_SMB_IOSIZE);
}
static struct pci_driver ali15x3_driver = {
.name = "ali15x3 smbus",
.id_table = ali15x3_ids,
.probe = ali15x3_probe,
.remove = __devexit_p(ali15x3_remove),
};
static int __init i2c_ali15x3_init(void)
{
PRINTK("i2c-ali15x3.o version %s (%s)\n", LM_VERSION, LM_DATE);
return pci_module_init(&ali15x3_driver);
}
static void __exit i2c_ali15x3_exit(void)
{
pci_unregister_driver(&ali15x3_driver);
}
MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl>, "
"Philip Edelbrock <phil@netroedge.com>, "
"and Mark D. Studebaker <mdsxyz123@yahoo.com>");
MODULE_DESCRIPTION("ALI15X3 SMBus driver");
MODULE_LICENSE("GPL");

module_init(i2c_ali15x3_init);
module_exit(i2c_ali15x3_exit);
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