Re: [Qemu-devel] ppc: regression in 2.7.0-rc3 on rfi/rfid/hrfi instructions

[Hervé Poussineau]

Le 25/08/2016 à 23:27, Benjamin Herrenschmidt a écrit :
> On Thu, 2016-08-25 at 22:14 +0200, Hervé Poussineau wrote:
> > Fixes: a2e71b28e832346409efc795ecd1f0a2bcb705a3
> > Reported-by: Hervé Poussineau <address@hidden>
> > Tested-by: Hervé Poussineau <address@hidden>
> >
> > For the problem to press enter to "activate this console", this is
> > another regression.
> > However, I was unable to pin-point it to a specific commit (too much
> > interwinded regressions)
> > It was working in 2.6.0 (commit
> > a2e71b28e832346409efc795ecd1f0a2bcb705a3)
>
> Well, if you can get me that kernel source, I may have more chances to
> track this down ;-)

Of course, I don't have the exact source :)

Here is the dmesg of the running system on QEMU 2.6.0:

Memory BAT mapping: BAT2=128Mb, BAT3=0Mb, residual: 0Mb
Total memory = 128MB; using 512kB for hash table (at c0300000)
Linux version 2.4.18 (address@hidden) (gcc version 2.95.4 20011002 (Debian 
prerelease)) #5 Wed May 21 23:50:43 AKDT 2003
PReP architecture
On node 0 totalpages: 32768
zone(0): 32768 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: console=/dev/ttyS0,9600 console=tty0 ether=5,0x210,eth0 
ether=11,0x300,eth1 ramdisk_size=8192 root=/dev/ram
time_init: decrementer frequency = 68.925649 MHz
Console: colour VGA+ 80x25
Calibrating delay loop... 691.40 BogoMIPS
Memory: 124740k available (1656k kernel code, 856k data, 248k init, 0k highmem)
Dentry-cache hash table entries: 16384 (order: 5, 131072 bytes)
Inode-cache hash table entries: 8192 (order: 4, 65536 bytes)
Mount-cache hash table entries: 2048 (order: 2, 16384 bytes)
Buffer-cache hash table entries: 8192 (order: 3, 32768 bytes)
Page-cache hash table entries: 32768 (order: 5, 131072 bytes)
POSIX conformance testing by UNIFIX
PCI: Probing PCI hardware
Fixup res 2 (200) of dev 00:0d.0: 31000000 -> f1000000
Fixup res 6 (7201) of dev 00:0d.0: f1010000 -> b1010000
Setting PCI interrupts for a "Mesquite cPCI (MCP750)"
PCI: Cannot allocate resource region 0 of PCI bridge 0
PCI: resource is 0..fffffff (100), parent c020105c
PCI:00:0d.0: Resource 2: f1000000-f1000fff (f=200)
PCI: Switching off ROM of 00:0d.0
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
devfs: v1.10 (20020120) Richard Gooch (address@hidden)
devfs: boot_options: 0x0
Detected PS/2 Mouse Port.
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI 
enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
request_module[parport_lowlevel]: Root fs not mounted
lp: driver loaded but no devices found
rtc: I/O port 112 is not free.
block: 128 slots per queue, batch=32
RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
hdc: QEMU DVD-ROM, ATAPI CD/DVD-ROM drive
hdc: IRQ probe failed (0x0)
hdd: IRQ probe failed (0x0)
hdd: IRQ probe failed (0x0)
ide1 at 0x170-0x177,0x376 on irq 13
hdc: ATAPI 4X DVD-ROM drive, 512kB Cache
Uniform CD-ROM driver Revision: 3.12
ide-floppy driver 0.97.sv
loop: loaded (max 8 devices)
ide-floppy driver 0.97.sv
SCSI subsystem driver Revision: 1.00
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Macintosh non-volatile memory driver v1.0
usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
usb.c: registered new driver hid
hid-core.c: v1.8 Andreas Gal, Vojtech Pavlik <address@hidden>
hid-core.c: USB HID support drivers
mice: PS/2 mouse device common for all mice
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 1024 buckets, 8Kbytes
TCP: Hash tables configured (established 8192 bind 8192)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
RAMDISK: Compressed image found at block 0
Freeing initrd memory: 852k freed
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 248k init 48k pmac 8k chrp 12k openfirmware

According to "INSTALLING LINUX" section of 
http://www.juneau-lug.org/sandalfoot.php
This is a 2.4.18 Debian kernel (2.2 or 3.0, I didn't understood), where is 
applied a patch from Sven Dickert, available at 
http://www.remote.org/sven/ppc/40p.patch

Hervé