How stable is 2.6 on a SB1250 processor?

How stable is 2.6 on a SB1250 processor?

[Kevin Paul Herbert]

I'm working on bringing up the 2.6 kernel on a board using the SB1250
processor, and I have a problem in userland that I'm wondering if anyone
else has seen.

I built a simple test program for userland, which just uses the write()
syscall to say hello world. This is statically linked, and it works
under a 2.4 kernel. Under 2.6, I get no output. My guess is that an
exception is occuring, the signal gets back to my test program, and it
is looping.

I've written a simple assembly language hello world program which does
the exact same thing... write() syscall and I get my hello world.

My next task is to get kgdb working on this board so I can do some
better debugging, but I was wondering if anyone else has seen this
problem, or for that matter whether the SB1 processor support is
expected to work at all.

Thanks for any help,

Kevin


-- 
Kevin Paul Herbert <kph@cisco.com>
cisco Systems, Inc.

Re: How stable is 2.6 on a SB1250 processor?

[Pete Popov]

I think userland is still broken. Ralf was working on the access_ok
problem the last time I talked to him.

Pete

On Tue, 2004-01-13 at 13:03, Kevin Paul Herbert wrote:
> I'm working on bringing up the 2.6 kernel on a board using the SB1250
> processor, and I have a problem in userland that I'm wondering if anyone
> else has seen.
> 
> I built a simple test program for userland, which just uses the write()
> syscall to say hello world. This is statically linked, and it works
> under a 2.4 kernel. Under 2.6, I get no output. My guess is that an
> exception is occuring, the signal gets back to my test program, and it
> is looping.
> 
> I've written a simple assembly language hello world program which does
> the exact same thing... write() syscall and I get my hello world.
> 
> My next task is to get kgdb working on this board so I can do some
> better debugging, but I was wondering if anyone else has seen this
> problem, or for that matter whether the SB1 processor support is
> expected to work at all.
> 
> Thanks for any help,
> 
> Kevin
> 

Re: How stable is 2.6 on a SB1250 processor?

[Dimitri Torfs]

On Tue, Jan 13, 2004 at 01:09:25PM -0800, Pete Popov wrote:
> 
> I think userland is still broken. Ralf was working on the access_ok
> problem the last time I talked to him.
> 

Yes, if it's a 32-bit kernel then it's definitely broken. You might want
to check out
http://www.linux-mips.org/archives/linux-mips/2004-01/msg00000.html.

After that fix, user space stuff started to work for me.

Dimitri


-- 
Dimitri Torfs       |  NSCE 
dimitri@sonycom.com |  The Corporate Village
tel: +32 2 7008541  |  Da Vincilaan 7 - D1 
fax: +32 2 7008622  |  B-1935 Zaventem - Belgium

Re: How stable is 2.6 on a SB1250 processor?

[Jun Sun]

On Tue, Jan 13, 2004 at 10:44:54PM +0100, Dimitri Torfs wrote:
> On Tue, Jan 13, 2004 at 01:09:25PM -0800, Pete Popov wrote:
> > 
> > I think userland is still broken. Ralf was working on the access_ok
> > problem the last time I talked to him.
> > 
> 
> Yes, if it's a 32-bit kernel then it's definitely broken. You might want
> to check out
> http://www.linux-mips.org/archives/linux-mips/2004-01/msg00000.html.
> 
> After that fix, user space stuff started to work for me.
> 

Yes, that is a temporary fix for the problem.

bcm1250 PCI still have issues though.  I have not looked into it.

What is troubling me most is either rockhopper nor malta works on 2.6.
With rockhopper I had to disable cache in order to run.  I
suspect there is something fundamental still not quite right, possibly
only affecting cache noncoherent systems.

More debugging fun ...

Jun

Re: How stable is 2.6 on a SB1250 processor?

[Ralf Baechle]

On Tue, Jan 13, 2004 at 02:31:37PM -0800, Jun Sun wrote:

> What is troubling me most is either rockhopper nor malta works on 2.6.

I have a success report with 2.6 on Malta from yesterday.  I'll check if
any patching was required but I'm interested in your Malta's configuration.

  Ralf

Re: How stable is 2.6 on a SB1250 processor?

[Jun Sun]

[-- Attachment #1: Type: text/plain, Size: 420 bytes --]

On Tue, Jan 13, 2004 at 11:45:52PM +0100, Ralf Baechle wrote:
> On Tue, Jan 13, 2004 at 02:31:37PM -0800, Jun Sun wrote:
> 
> > What is troubling me most is either rockhopper nor malta works on 2.6.
> 
> I have a success report with 2.6 on Malta from yesterday.  I'll check if
> any patching was required but I'm interested in your Malta's configuration.
> 

Here is the config I am using ... with access_ok() fix.

Jun

[-- Attachment #2: .config --]
[-- Type: text/plain, Size: 11564 bytes --]

#
# Automatically generated make config: don't edit
#
CONFIG_MIPS=y
# CONFIG_MIPS64 is not set
# CONFIG_64BIT is not set
CONFIG_MIPS32=y

#
# Code maturity level options
#
CONFIG_EXPERIMENTAL=y
CONFIG_CLEAN_COMPILE=y
CONFIG_STANDALONE=y
CONFIG_BROKEN_ON_SMP=y

#
# General setup
#
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
# CONFIG_BSD_PROCESS_ACCT is not set
CONFIG_SYSCTL=y
CONFIG_LOG_BUF_SHIFT=14
# CONFIG_IKCONFIG is not set
CONFIG_EMBEDDED=y
CONFIG_KALLSYMS=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_AS=y
CONFIG_IOSCHED_DEADLINE=y

#
# Loadable module support
#
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
# CONFIG_MODULE_FORCE_UNLOAD is not set
CONFIG_OBSOLETE_MODPARM=y
CONFIG_MODVERSIONS=y
CONFIG_KMOD=y

#
# Machine selection
#
# CONFIG_MACH_JAZZ is not set
# CONFIG_BAGET_MIPS is not set
# CONFIG_MACH_VR41XX is not set
# CONFIG_TOSHIBA_JMR3927 is not set
# CONFIG_MIPS_COBALT is not set
# CONFIG_MACH_DECSTATION is not set
# CONFIG_MIPS_EV64120 is not set
# CONFIG_MIPS_EV96100 is not set
# CONFIG_MIPS_IVR is not set
# CONFIG_LASAT is not set
# CONFIG_HP_LASERJET is not set
# CONFIG_MIPS_ITE8172 is not set
# CONFIG_MIPS_ATLAS is not set
CONFIG_MIPS_MALTA=y
# CONFIG_MIPS_SEAD is not set
# CONFIG_MOMENCO_OCELOT is not set
# CONFIG_MOMENCO_OCELOT_G is not set
# CONFIG_MOMENCO_OCELOT_C is not set
# CONFIG_MOMENCO_JAGUAR_ATX is not set
# CONFIG_PMC_YOSEMITE is not set
# CONFIG_DDB5074 is not set
# CONFIG_DDB5476 is not set
# CONFIG_DDB5477 is not set
# CONFIG_NEC_OSPREY is not set
# CONFIG_SGI_IP22 is not set
# CONFIG_SGI_IP32 is not set
# CONFIG_MACH_AU1X00 is not set
# CONFIG_SIBYTE_SB1xxx_SOC is not set
# CONFIG_SNI_RM200_PCI is not set
# CONFIG_TOSHIBA_RBTX4927 is not set
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_HAVE_DEC_LOCK=y
CONFIG_DMA_NONCOHERENT=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_I8259=y
CONFIG_MIPS_BONITO64=y
CONFIG_MIPS_MSC=y
CONFIG_CPU_LITTLE_ENDIAN=y
CONFIG_MIPS_BOARDS_GEN=y
CONFIG_MIPS_GT64120=y
CONFIG_SWAP_IO_SPACE=y
CONFIG_BOOT_ELF32=y
CONFIG_MIPS_L1_CACHE_SHIFT=5
# CONFIG_FB is not set
CONFIG_HAVE_STD_PC_SERIAL_PORT=y

#
# CPU selection
#
CONFIG_CPU_MIPS32=y
# CONFIG_CPU_MIPS64 is not set
# CONFIG_CPU_R3000 is not set
# CONFIG_CPU_TX39XX is not set
# CONFIG_CPU_VR41XX is not set
# CONFIG_CPU_R4300 is not set
# CONFIG_CPU_R4X00 is not set
# CONFIG_CPU_TX49XX is not set
# CONFIG_CPU_R5000 is not set
# CONFIG_CPU_R5432 is not set
# CONFIG_CPU_R6000 is not set
# CONFIG_CPU_NEVADA is not set
# CONFIG_CPU_R8000 is not set
# CONFIG_CPU_R10000 is not set
# CONFIG_CPU_RM7000 is not set
# CONFIG_CPU_RM9000 is not set
# CONFIG_CPU_SB1 is not set
CONFIG_PAGE_SIZE_4KB=y
# CONFIG_PAGE_SIZE_16KB is not set
# CONFIG_PAGE_SIZE_64KB is not set
CONFIG_CPU_HAS_PREFETCH=y
# CONFIG_VTAG_ICACHE is not set
# CONFIG_64BIT_PHYS_ADDR is not set
# CONFIG_CPU_ADVANCED is not set
CONFIG_CPU_HAS_LLSC=y
CONFIG_CPU_HAS_SYNC=y
# CONFIG_PREEMPT is not set
# CONFIG_DEBUG_INFO is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_SPINLOCK_SLEEP is not set

#
# Bus options (PCI, PCMCIA, EISA, ISA, TC)
#
CONFIG_PCI=y
CONFIG_PCI_LEGACY_PROC=y
CONFIG_PCI_NAMES=y
CONFIG_MMU=y
# CONFIG_HOTPLUG is not set

#
# Executable file formats
#
CONFIG_BINFMT_ELF=y
# CONFIG_BINFMT_MISC is not set
CONFIG_TRAD_SIGNALS=y

#
# MIPS initrd options
#
CONFIG_EMBEDDED_RAMDISK=y
CONFIG_EMBEDDED_RAMDISK_IMAGE="ramdisk.gz"

#
# Device Drivers
#

#
# Generic Driver Options
#

#
# Memory Technology Devices (MTD)
#
# CONFIG_MTD is not set

#
# Parallel port support
#
# CONFIG_PARPORT is not set

#
# Plug and Play support
#
# CONFIG_PNP is not set

#
# Block devices
#
# CONFIG_BLK_DEV_FD is not set
# CONFIG_BLK_CPQ_DA is not set
# CONFIG_BLK_CPQ_CISS_DA is not set
# CONFIG_BLK_DEV_DAC960 is not set
# CONFIG_BLK_DEV_UMEM is not set
# CONFIG_BLK_DEV_LOOP is not set
# CONFIG_BLK_DEV_NBD is not set
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=16384
CONFIG_BLK_DEV_INITRD=y
# CONFIG_LBD is not set

#
# ATA/ATAPI/MFM/RLL support
#
# CONFIG_IDE is not set

#
# SCSI device support
#
# CONFIG_SCSI is not set

#
# Multi-device support (RAID and LVM)
#
# CONFIG_MD is not set

#
# Fusion MPT device support
#

#
# IEEE 1394 (FireWire) support (EXPERIMENTAL)
#
# CONFIG_IEEE1394 is not set

#
# I2O device support
#
# CONFIG_I2O is not set

#
# Networking support
#
CONFIG_NET=y

#
# Networking options
#
# CONFIG_PACKET is not set
CONFIG_NETLINK_DEV=y
CONFIG_UNIX=y
CONFIG_NET_KEY=y
CONFIG_INET=y
# CONFIG_IP_MULTICAST is not set
# CONFIG_IP_ADVANCED_ROUTER is not set
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
# CONFIG_IP_PNP_RARP is not set
# CONFIG_NET_IPIP is not set
# CONFIG_NET_IPGRE is not set
# CONFIG_ARPD is not set
# CONFIG_INET_ECN is not set
# CONFIG_SYN_COOKIES is not set
# CONFIG_INET_AH is not set
# CONFIG_INET_ESP is not set
# CONFIG_INET_IPCOMP is not set
# CONFIG_IPV6 is not set
# CONFIG_DECNET is not set
# CONFIG_BRIDGE is not set
# CONFIG_NETFILTER is not set
CONFIG_XFRM=y
# CONFIG_XFRM_USER is not set

#
# SCTP Configuration (EXPERIMENTAL)
#
CONFIG_IPV6_SCTP__=y
# CONFIG_IP_SCTP is not set
# CONFIG_ATM is not set
# CONFIG_VLAN_8021Q is not set
# CONFIG_LLC2 is not set
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_NET_DIVERT is not set
# CONFIG_ECONET is not set
# CONFIG_WAN_ROUTER is not set
# CONFIG_NET_FASTROUTE is not set
# CONFIG_NET_HW_FLOWCONTROL is not set

#
# QoS and/or fair queueing
#
# CONFIG_NET_SCHED is not set

#
# Network testing
#
# CONFIG_NET_PKTGEN is not set
CONFIG_NETDEVICES=y

#
# ARCnet devices
#
# CONFIG_ARCNET is not set
# CONFIG_DUMMY is not set
# CONFIG_BONDING is not set
# CONFIG_EQUALIZER is not set
# CONFIG_TUN is not set
# CONFIG_ETHERTAP is not set

#
# Ethernet (10 or 100Mbit)
#
CONFIG_NET_ETHERNET=y
CONFIG_MII=y
# CONFIG_HAPPYMEAL is not set
# CONFIG_SUNGEM is not set
# CONFIG_NET_VENDOR_3COM is not set

#
# Tulip family network device support
#
# CONFIG_NET_TULIP is not set
# CONFIG_HP100 is not set
CONFIG_NET_PCI=y
CONFIG_PCNET32=y
# CONFIG_AMD8111_ETH is not set
# CONFIG_ADAPTEC_STARFIRE is not set
# CONFIG_B44 is not set
# CONFIG_DGRS is not set
# CONFIG_EEPRO100 is not set
# CONFIG_E100 is not set
# CONFIG_FEALNX is not set
# CONFIG_NATSEMI is not set
# CONFIG_NE2K_PCI is not set
# CONFIG_8139CP is not set
# CONFIG_8139TOO is not set
# CONFIG_SIS900 is not set
# CONFIG_EPIC100 is not set
# CONFIG_SUNDANCE is not set
# CONFIG_TLAN is not set
# CONFIG_VIA_RHINE is not set
# CONFIG_LAN_SAA9730 is not set

#
# Ethernet (1000 Mbit)
#
# CONFIG_ACENIC is not set
# CONFIG_DL2K is not set
# CONFIG_E1000 is not set
# CONFIG_NS83820 is not set
# CONFIG_HAMACHI is not set
# CONFIG_YELLOWFIN is not set
# CONFIG_R8169 is not set
# CONFIG_SIS190 is not set
# CONFIG_SK98LIN is not set
# CONFIG_TIGON3 is not set

#
# Ethernet (10000 Mbit)
#
# CONFIG_IXGB is not set
# CONFIG_FDDI is not set
# CONFIG_HIPPI is not set
# CONFIG_PPP is not set
# CONFIG_SLIP is not set

#
# Wireless LAN (non-hamradio)
#
# CONFIG_NET_RADIO is not set

#
# Token Ring devices
#
# CONFIG_TR is not set
# CONFIG_RCPCI is not set
# CONFIG_SHAPER is not set

#
# Wan interfaces
#
# CONFIG_WAN is not set

#
# Amateur Radio support
#
# CONFIG_HAMRADIO is not set

#
# IrDA (infrared) support
#
# CONFIG_IRDA is not set

#
# Bluetooth support
#
# CONFIG_BT is not set

#
# ISDN subsystem
#
# CONFIG_ISDN_BOOL is not set

#
# Telephony Support
#
# CONFIG_PHONE is not set

#
# Input device support
#
CONFIG_INPUT=y

#
# Userland interfaces
#
CONFIG_INPUT_MOUSEDEV=y
CONFIG_INPUT_MOUSEDEV_PSAUX=y
CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
# CONFIG_INPUT_JOYDEV is not set
# CONFIG_INPUT_TSDEV is not set
# CONFIG_INPUT_EVDEV is not set
# CONFIG_INPUT_EVBUG is not set

#
# Input I/O drivers
#
# CONFIG_GAMEPORT is not set
CONFIG_SOUND_GAMEPORT=y
CONFIG_SERIO=y
# CONFIG_SERIO_I8042 is not set
CONFIG_SERIO_SERPORT=y
# CONFIG_SERIO_CT82C710 is not set
# CONFIG_SERIO_PCIPS2 is not set

#
# Input Device Drivers
#
# CONFIG_INPUT_KEYBOARD is not set
# CONFIG_INPUT_MOUSE is not set
# CONFIG_INPUT_JOYSTICK is not set
# CONFIG_INPUT_TOUCHSCREEN is not set
# CONFIG_INPUT_MISC is not set

#
# Character devices
#
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
# CONFIG_SERIAL_NONSTANDARD is not set

#
# Serial drivers
#
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_NR_UARTS=4
# CONFIG_SERIAL_8250_EXTENDED is not set

#
# Non-8250 serial port support
#
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_UNIX98_PTY_COUNT=256

#
# I2C support
#
# CONFIG_I2C is not set

#
# I2C Algorithms
#

#
# I2C Hardware Bus support
#

#
# I2C Hardware Sensors Chip support
#
# CONFIG_I2C_SENSOR is not set

#
# Mice
#
# CONFIG_BUSMOUSE is not set
# CONFIG_QIC02_TAPE is not set

#
# IPMI
#
# CONFIG_IPMI_HANDLER is not set

#
# Watchdog Cards
#
# CONFIG_WATCHDOG is not set
# CONFIG_NVRAM is not set
CONFIG_RTC=y
# CONFIG_DTLK is not set
# CONFIG_R3964 is not set
# CONFIG_APPLICOM is not set

#
# Ftape, the floppy tape device driver
#
# CONFIG_FTAPE is not set
# CONFIG_AGP is not set
# CONFIG_DRM is not set
# CONFIG_RAW_DRIVER is not set

#
# Multimedia devices
#
# CONFIG_VIDEO_DEV is not set

#
# Digital Video Broadcasting Devices
#
# CONFIG_DVB is not set

#
# Graphics support
#

#
# Console display driver support
#
# CONFIG_VGA_CONSOLE is not set
# CONFIG_MDA_CONSOLE is not set
CONFIG_DUMMY_CONSOLE=y

#
# Sound
#
# CONFIG_SOUND is not set

#
# USB support
#
# CONFIG_USB is not set
# CONFIG_USB_GADGET is not set

#
# File systems
#
CONFIG_EXT2_FS=y
# CONFIG_EXT2_FS_XATTR is not set
# CONFIG_EXT3_FS is not set
# CONFIG_JBD is not set
# CONFIG_REISERFS_FS is not set
# CONFIG_JFS_FS is not set
# CONFIG_XFS_FS is not set
# CONFIG_MINIX_FS is not set
# CONFIG_ROMFS_FS is not set
# CONFIG_QUOTA is not set
CONFIG_AUTOFS_FS=y
# CONFIG_AUTOFS4_FS is not set

#
# CD-ROM/DVD Filesystems
#
# CONFIG_ISO9660_FS is not set
# CONFIG_UDF_FS is not set

#
# DOS/FAT/NT Filesystems
#
# CONFIG_FAT_FS is not set
# CONFIG_NTFS_FS is not set

#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
# CONFIG_DEVFS_FS is not set
CONFIG_DEVPTS_FS=y
CONFIG_DEVPTS_FS_XATTR=y
CONFIG_DEVPTS_FS_SECURITY=y
# CONFIG_TMPFS is not set
# CONFIG_HUGETLB_PAGE is not set
CONFIG_RAMFS=y

#
# Miscellaneous filesystems
#
# CONFIG_ADFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
CONFIG_EFS_FS=y
# CONFIG_CRAMFS is not set
# CONFIG_VXFS_FS is not set
# CONFIG_HPFS_FS is not set
# CONFIG_QNX4FS_FS is not set
# CONFIG_SYSV_FS is not set
# CONFIG_UFS_FS is not set

#
# Network File Systems
#
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
# CONFIG_NFS_V4 is not set
# CONFIG_NFS_DIRECTIO is not set
CONFIG_NFSD=y
CONFIG_NFSD_V3=y
# CONFIG_NFSD_V4 is not set
# CONFIG_NFSD_TCP is not set
CONFIG_ROOT_NFS=y
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_EXPORTFS=y
CONFIG_SUNRPC=y
# CONFIG_SUNRPC_GSS is not set
# CONFIG_SMB_FS is not set
# CONFIG_CIFS is not set
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
# CONFIG_INTERMEZZO_FS is not set
# CONFIG_AFS_FS is not set

#
# Partition Types
#
# CONFIG_PARTITION_ADVANCED is not set
CONFIG_MSDOS_PARTITION=y

#
# Kernel hacking
#
CONFIG_CROSSCOMPILE=y
CONFIG_DEBUG_KERNEL=y
# CONFIG_KGDB is not set
# CONFIG_RUNTIME_DEBUG is not set
# CONFIG_MAGIC_SYSRQ is not set
CONFIG_MIPS_UNCACHED=y

#
# Security options
#
# CONFIG_SECURITY is not set

#
# Cryptographic options
#
# CONFIG_CRYPTO is not set

#
# Library routines
#
CONFIG_CRC32=y

Re: How stable is 2.6 on a SB1250 processor?

[Kevin Paul Herbert]

Thanks for the tips. I incorporated Dmitri's patches to uaccess.h and
the syscall handlers and got usermode to come up correctly.

I'm aware of the SB1250 PCI problems and will be addressing that after I
get a few more on-board peripherals working. I've got my own fairly
complex PCI subsystem to port from 2.4 (hotplug, many bridges,
hypertransport configuration) and the main thing that I need from the
core SB1250 support is the ability to generate configuration cycles.
Because of the way the hardware works, I have to program all the bridges
myself (the ROM firmware does not do this for me).

I'll be sure to send patches to the list for anything I fix in the core
SB1250 PCI support.

Thanks again for the tips,

Kevin


-- 
Kevin Paul Herbert <kph@cisco.com>
cisco Systems, Inc.