What happened to Cyrix 6x86 support in 2.6?

What happened to Cyrix 6x86 support in 2.6?

[Gregor Jasny]

Hi,

I have an old machine with a Cyrix 6x86 processor. When running Linux 2.4 it is recognized as a Cyrix and MTRR is enabled:

kernel: Linux version 2.4.22 (root@Rincewind) (gcc version 2.95.4 20011002 (Debian prerelease)) #2 Fri Nov 28 15:43:13 CET 2003
...
kernel: Enabling CPUID on Cyrix processor.
kernel: CPU:     After generic, caps: 00000105 00000000 00000000 00000004
kernel: CPU:             Common caps: 00000105 00000000 00000000 00000004
kernel: CPU: Cyrix 6x86L 2x Core/Bus Clock stepping 02

But when I boot a Linux 2.6 kernel with CONFIG_M586=y it recognizes only a 486.

Can somebody explain this behavior? Was support for Cyrix 6x86 dropped?

Cheers,
Gregor

Re: What happened to Cyrix 6x86 support in 2.6?

[Ondrej Zary]

Gregor Jasny wrote:
> Hi,
> 
> I have an old machine with a Cyrix 6x86 processor. When running Linux 2.4 it is recognized as a Cyrix and MTRR is enabled:
> 
> kernel: Linux version 2.4.22 (root@Rincewind) (gcc version 2.95.4 20011002 (Debian prerelease)) #2 Fri Nov 28 15:43:13 CET 2003
> ...
> kernel: Enabling CPUID on Cyrix processor.
> kernel: CPU:     After generic, caps: 00000105 00000000 00000000 00000004
> kernel: CPU:             Common caps: 00000105 00000000 00000000 00000004
> kernel: CPU: Cyrix 6x86L 2x Core/Bus Clock stepping 02
> 
> But when I boot a Linux 2.6 kernel with CONFIG_M586=y it recognizes only a 486.

Something like that also happened with my UMC 486. It's now detected as:

Linux version 2.6.8.1-router (root@pentium) (gcc version 3.3.4) #1 Thu 
Sep 9 12:42:25 CEST 2004
...
CPU: After generic identify, caps: 00000000 00000000 00000000 00000000
CPU: After all inits, caps:        00000000 00000000 00000000 00000000
CPU: UMC UMC UMC  ff/02 stepping 03

It used to be detected more nicely in 2.4.x (I don't remember exact string).

-- 
Ondrej Zary

Re: What happened to Cyrix 6x86 support in 2.6?

[Diego Calleja]

El Sat, 21 May 2005 16:25:56 +0200,
Gregor Jasny <gjasny@web.de> escribió:

> But when I boot a Linux 2.6 kernel with CONFIG_M586=y it recognizes only a 486.

Seems to work well here, same config.

processor       : 0
vendor_id       : CyrixInstead
cpu family      : 6
model           : 2
model name      : 6x86MX 3x Core/Bus Clock
stepping        : 7
cpu MHz         : 200.512


Linux version 2.6.12-rc4-mm2 (diego@estel) (gcc versión 3.3.5 (Debian 1:3.3.5-12)) #14 Sat May 21 17:46:33 CEST 2005
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 0000000002000000 (usable)
 BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
32MB LOWMEM available.
On node 0 totalpages: 8192
  DMA zone: 4096 pages, LIFO batch:1
  Normal zone: 4096 pages, LIFO batch:1
  HighMem zone: 0 pages, LIFO batch:1
DMI 2.0 present.
Allocating PCI resources starting at 02000000 (gap: 02000000:fdff0000)
Built 1 zonelists
No local APIC present or hardware disabled
mapped APIC to ffffd000 (01041000)
Initializing CPU#0
Kernel command line: profile=2 ro root=/dev/hda1
kernel profiling enabled (shift: 2)
CPU 0 irqstacks, hard=c0325000 soft=c0324000
PID hash table entries: 256 (order: 8, 4096 bytes)
Detected 200.512 MHz processor.
Using tsc for high-res timesource
Console: colour dummy device 80x25
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 27992k/32768k available (1513k kernel code, 4344k reserved, 480k data, 172k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 401.53 BogoMIPS (lpj=200766)
Mount-cache hash table entries: 512
CPU: After generic identify, caps: 0080a135 00000000 00000000 00000000 00000000 00000000 00000000
CPU: After vendor identify, caps: 0080a135 00000000 00000000 00000000 00000000 00000000 00000000
CPU: After all inits, caps: 0080a135 00000000 00000000 00000004 00000000 00000000 00000000
CPU: Cyrix 6x86MX 3x Core/Bus Clock stepping 07
Checking 'hlt' instruction... OK.
NET: Registered protocol family 16
PCI: PCI BIOS revision 2.10 entry at 0xfb3b0, last bus=0
PCI: Using configuration type 1
mtrr: v2.0 (20020519)
Linux Plug and Play Support v0.97 (c) Adam Belay
PnPBIOS: Scanning system for PnP BIOS support...
PnPBIOS: Found PnP BIOS installation structure at 0xc00fc070
PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0xc098, dseg 0xf0000
PnPBIOS: 13 nodes reported by PnP BIOS; 13 recorded by driver
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
PCI: Ignoring BAR0-3 of IDE controller 0000:00:01.1
PCI: Cannot allocate resource region 4 of device 0000:00:01.1
pnp: the driver 'system' has been registered
pnp: match found with the PnP device '00:07' and the driver 'system'
pnp: match found with the PnP device '00:09' and the driver 'system'
pnp: 00:09: ioport range 0x208-0x20f has been reserved
IA-32 Microcode Update Driver: v1.14 <tigran@veritas.com>
isapnp: Scanning for PnP cards...
pnp: Calling quirk for 01:01.03
pnp: CMI8330 quirk - fixing interrupts and dma
isapnp: Card 'CMI8330. Audio Adapter'
isapnp: 1 Plug & Play card detected total
lp: driver loaded but no devices found
Real Time Clock Driver v1.12
Non-volatile memory driver v1.2
ppdev: user-space parallel port driver
pnp: the driver 'i8042 kbd' has been registered
pnp: match found with the PnP device '00:04' and the driver 'i8042 kbd'
pnp: the driver 'i8042 aux' has been registered
PNP: PS/2 controller doesn't have AUX irq; using default 0xc
PNP: PS/2 Controller [PNP0303] at 0x60,0x64 irq 1,12
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing disabled
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A
pnp: the driver 'serial' has been registered
pnp: match found with the PnP device '00:0a' and the driver 'serial'
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
pnp: the driver 'parport_pc' has been registered
pnp: match found with the PnP device '00:0c' and the driver 'parport_pc'
parport: PnPBIOS parport detected.
parport0: PC-style at 0x378, irq 7 [PCSPP]
lp0: using parport0 (interrupt-driven).
lp0: console ready
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
FDC 0 is a post-1991 82077
loop: loaded (max 8 devices)
3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
0000:00:0f.0: 3Com PCI 3c905 Boomerang 100baseTx at 0x6000. Vers LK1.1.19
eth0: Dropping NETIF_F_SG since no checksum feature.
PPP generic driver version 2.4.2
PPP BSD Compression module registered
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
SIS5513: IDE controller at PCI slot 0000:00:01.1
SIS5513: chipset revision 193
SIS5513: not 100% native mode: will probe irqs later
SIS5513: SiS5571 ATA 16 controller
    ide0: BM-DMA at 0x1000-0x1007, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0x1008-0x100f, BIOS settings: hdc:pio, hdd:pio
Probing IDE interface ide0...
hda: ST32122A, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Probing IDE interface ide1...
Probing IDE interface ide1...
Probing IDE interface ide2...
Probing IDE interface ide3...
Probing IDE interface ide4...
Probing IDE interface ide5...
hda: max request size: 128KiB
hda: 4124736 sectors (2111 MB) w/128KiB Cache, CHS=4092/16/63
hda: cache flushes not supported
 hda: hda1 hda2
mice: PS/2 mouse device common for all mice
oprofile: using timer interrupt.
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
ip_conntrack version 2.1 (256 buckets, 2048 max) - 212 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
NET: Registered protocol family 1
NET: Registered protocol family 17
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 172k freed
kjournald starting.  Commit interval 5 seconds
Adding 96760k swap on /dev/hda2.  Priority:-1 extents:1
EXT3-fs warning: checktime reached, running e2fsck is recommended
EXT3 FS on hda1, internal journal
ttyS1: LSR safety check engaged!
ttyS1: LSR safety check engaged!

Re: What happened to Cyrix 6x86 support in 2.6?

[Ondrej Zary]

Diego Calleja wrote:
> El Sat, 21 May 2005 16:25:56 +0200,
> Gregor Jasny <gjasny@web.de> escribió:
> 
> 
>>But when I boot a Linux 2.6 kernel with CONFIG_M586=y it recognizes only a 486.
> 
> 
> Seems to work well here, same config.
>
> processor       : 0
> vendor_id       : CyrixInstead
> cpu family      : 6
> model           : 2
> model name      : 6x86MX 3x Core/Bus Clock
> stepping        : 7
> cpu MHz         : 200.512

6x86MX is newer than 6x86L - and also more "stantard one". IIRC, the 
CPUID instruction can be disabled on some Cyrix CPUs. 6x86 without CPUID 
might look like a 486. So maybe something is wrong with this.
I have Cyrix MII (newer 6x86MX renamed) and it works fine too.

Linux version 2.6.12-rc3-pentium (root@pentium) (gcc version 3.3.5) #8 
Sat May 14 20:02:42 CEST 2005
...
CPU: After generic identify, caps: 0080a135 00000000 00000000 00000000 
00000000 00000000 00000000
CPU: After vendor identify, caps: 0080a135 00000000 00000000 00000000 
00000000 00000000 00000000
CPU: After all inits, caps: 0080a135 00000000 00000000 00000004 00000000 
00000000 00000000
CPU: Cyrix M II 3x Core/Bus Clock stepping 04


> Linux version 2.6.12-rc4-mm2 (diego@estel) (gcc versión 3.3.5 (Debian 1:3.3.5-12)) #14 Sat May 21 17:46:33 CEST 2005
> BIOS-provided physical RAM map:
>  BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
>  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
>  BIOS-e820: 0000000000100000 - 0000000002000000 (usable)
>  BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
> 32MB LOWMEM available.
> On node 0 totalpages: 8192
>   DMA zone: 4096 pages, LIFO batch:1
>   Normal zone: 4096 pages, LIFO batch:1
>   HighMem zone: 0 pages, LIFO batch:1
> DMI 2.0 present.
> Allocating PCI resources starting at 02000000 (gap: 02000000:fdff0000)
> Built 1 zonelists
> No local APIC present or hardware disabled
> mapped APIC to ffffd000 (01041000)
> Initializing CPU#0
> Kernel command line: profile=2 ro root=/dev/hda1
> kernel profiling enabled (shift: 2)
> CPU 0 irqstacks, hard=c0325000 soft=c0324000
> PID hash table entries: 256 (order: 8, 4096 bytes)
> Detected 200.512 MHz processor.
> Using tsc for high-res timesource
> Console: colour dummy device 80x25
> Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
> Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
> Memory: 27992k/32768k available (1513k kernel code, 4344k reserved, 480k data, 172k init, 0k highmem)
> Checking if this processor honours the WP bit even in supervisor mode... Ok.
> Calibrating delay using timer specific routine.. 401.53 BogoMIPS (lpj=200766)
> Mount-cache hash table entries: 512
> CPU: After generic identify, caps: 0080a135 00000000 00000000 00000000 00000000 00000000 00000000
> CPU: After vendor identify, caps: 0080a135 00000000 00000000 00000000 00000000 00000000 00000000
> CPU: After all inits, caps: 0080a135 00000000 00000000 00000004 00000000 00000000 00000000
> CPU: Cyrix 6x86MX 3x Core/Bus Clock stepping 07
> Checking 'hlt' instruction... OK.
> NET: Registered protocol family 16
> PCI: PCI BIOS revision 2.10 entry at 0xfb3b0, last bus=0
> PCI: Using configuration type 1
> mtrr: v2.0 (20020519)
> Linux Plug and Play Support v0.97 (c) Adam Belay
> PnPBIOS: Scanning system for PnP BIOS support...
> PnPBIOS: Found PnP BIOS installation structure at 0xc00fc070
> PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0xc098, dseg 0xf0000
> PnPBIOS: 13 nodes reported by PnP BIOS; 13 recorded by driver
> PCI: Probing PCI hardware
> PCI: Probing PCI hardware (bus 00)
> PCI: Ignoring BAR0-3 of IDE controller 0000:00:01.1
> PCI: Cannot allocate resource region 4 of device 0000:00:01.1
> pnp: the driver 'system' has been registered
> pnp: match found with the PnP device '00:07' and the driver 'system'
> pnp: match found with the PnP device '00:09' and the driver 'system'
> pnp: 00:09: ioport range 0x208-0x20f has been reserved
> IA-32 Microcode Update Driver: v1.14 <tigran@veritas.com>
> isapnp: Scanning for PnP cards...
> pnp: Calling quirk for 01:01.03
> pnp: CMI8330 quirk - fixing interrupts and dma
> isapnp: Card 'CMI8330. Audio Adapter'
> isapnp: 1 Plug & Play card detected total
> lp: driver loaded but no devices found
> Real Time Clock Driver v1.12
> Non-volatile memory driver v1.2
> ppdev: user-space parallel port driver
> pnp: the driver 'i8042 kbd' has been registered
> pnp: match found with the PnP device '00:04' and the driver 'i8042 kbd'
> pnp: the driver 'i8042 aux' has been registered
> PNP: PS/2 controller doesn't have AUX irq; using default 0xc
> PNP: PS/2 Controller [PNP0303] at 0x60,0x64 irq 1,12
> serio: i8042 AUX port at 0x60,0x64 irq 12
> serio: i8042 KBD port at 0x60,0x64 irq 1
> Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing disabled
> ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A
> pnp: the driver 'serial' has been registered
> pnp: match found with the PnP device '00:0a' and the driver 'serial'
> ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> pnp: the driver 'parport_pc' has been registered
> pnp: match found with the PnP device '00:0c' and the driver 'parport_pc'
> parport: PnPBIOS parport detected.
> parport0: PC-style at 0x378, irq 7 [PCSPP]
> lp0: using parport0 (interrupt-driven).
> lp0: console ready
> io scheduler noop registered
> io scheduler anticipatory registered
> io scheduler deadline registered
> io scheduler cfq registered
> FDC 0 is a post-1991 82077
> loop: loaded (max 8 devices)
> 3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
> 0000:00:0f.0: 3Com PCI 3c905 Boomerang 100baseTx at 0x6000. Vers LK1.1.19
> eth0: Dropping NETIF_F_SG since no checksum feature.
> PPP generic driver version 2.4.2
> PPP BSD Compression module registered
> Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> SIS5513: IDE controller at PCI slot 0000:00:01.1
> SIS5513: chipset revision 193
> SIS5513: not 100% native mode: will probe irqs later
> SIS5513: SiS5571 ATA 16 controller
>     ide0: BM-DMA at 0x1000-0x1007, BIOS settings: hda:pio, hdb:pio
>     ide1: BM-DMA at 0x1008-0x100f, BIOS settings: hdc:pio, hdd:pio
> Probing IDE interface ide0...
> hda: ST32122A, ATA DISK drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> Probing IDE interface ide1...
> Probing IDE interface ide1...
> Probing IDE interface ide2...
> Probing IDE interface ide3...
> Probing IDE interface ide4...
> Probing IDE interface ide5...
> hda: max request size: 128KiB
> hda: 4124736 sectors (2111 MB) w/128KiB Cache, CHS=4092/16/63
> hda: cache flushes not supported
>  hda: hda1 hda2
> mice: PS/2 mouse device common for all mice
> oprofile: using timer interrupt.
> NET: Registered protocol family 2
> IP: routing cache hash table of 512 buckets, 4Kbytes
> TCP established hash table entries: 2048 (order: 2, 16384 bytes)
> TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
> TCP: Hash tables configured (established 2048 bind 2048)
> ip_conntrack version 2.1 (256 buckets, 2048 max) - 212 bytes per conntrack
> ip_tables: (C) 2000-2002 Netfilter core team
> NET: Registered protocol family 1
> NET: Registered protocol family 17
> EXT3-fs: mounted filesystem with ordered data mode.
> VFS: Mounted root (ext3 filesystem) readonly.
> Freeing unused kernel memory: 172k freed
> kjournald starting.  Commit interval 5 seconds
> Adding 96760k swap on /dev/hda2.  Priority:-1 extents:1
> EXT3-fs warning: checktime reached, running e2fsck is recommended
> EXT3 FS on hda1, internal journal
> ttyS1: LSR safety check engaged!
> ttyS1: LSR safety check engaged!
> -
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> 


-- 
Ondrej Zary

Re: What happened to Cyrix 6x86 support in 2.6?

[Matthias-Christian Ott]

Gregor Jasny wrote:
> Hi,
> 
> I have an old machine with a Cyrix 6x86 processor. When running Linux 2.4 it is recognized as a Cyrix and MTRR is enabled:
> 
> kernel: Linux version 2.4.22 (root@Rincewind) (gcc version 2.95.4 20011002 (Debian prerelease)) #2 Fri Nov 28 15:43:13 CET 2003
> ...
> kernel: Enabling CPUID on Cyrix processor.
> kernel: CPU:     After generic, caps: 00000105 00000000 00000000 00000004
> kernel: CPU:             Common caps: 00000105 00000000 00000000 00000004
> kernel: CPU: Cyrix 6x86L 2x Core/Bus Clock stepping 02
> 
> But when I boot a Linux 2.6 kernel with CONFIG_M586=y it recognizes only a 486.
> 
> Can somebody explain this behavior? Was support for Cyrix 6x86 dropped?
> 
> Cheers,
> Gregor
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 
An hafl hour ago my cyrix with 150 Mhz was runnig very good with Fedora 4 Test 1.

Matthias-Christian Ott