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RE: [linuxsh-dev] new kernel, new-old problems
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From: Studencki P. <Paw...@er...> - 2001-02-26 16:28:16
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Hello, it's me again...
I'm not sure, but I hope, I find the reason of my problems...
I didn't mentioned in last mail, that I delete 'calibrate_delay();' from
init/main.c
It's not a solution, but after that kernel was going on. the problem is,
values of jiffies is const. I'm not a kernel hacker, (jiffies is art of time
counter - all I know) and I really have no idea, what caused this
behaviour!?
void __init calibrate_delay(void)
{
unsigned long ticks, loopbit;
int lps_precision = LPS_PREC;
loops_per_sec = (1<<12);
printk("Calibrating delay loop... ");
while (loops_per_sec <<= 1) {
/* wait for "start of" clock tick */
ticks = jiffies;
printk("before sub while\n");
while (ticks == jiffies) <======= jiffies hasn't
been changed !!!!
/* nothing */;
/* Go .. */
ticks = jiffies;
Second thing (perhaps it's related to calibrate delay loop)
With a kernel 2.4.0, I get: with 2.3.99-pre7:
CPU clock: 75.17MHz same CPU
Bus clock: 25.05MHz no info about bus
Module clock: 25.05MHz Module 75.18 MHz !!!!
Interval = 62648 Interval 187965
with 2.3.99-pre7 everything works OK.
could it be a cause of all other problems or it's not important?
How can I correct these values?
I would be grateful for any help
Pawel
> Short description:
> software: kernel-2.4.0-test11, glibc-2.2.2
> hardware: SH0079, SH3, debug with SCI
>
> I created this devices in folder /dev
>
> drwxr-xr-x 2 root root 1024 Feb 23 17:42 .
> drwxr-xr-x 10 root root 1024 Feb 22 11:57 ..
> lrwxrwxrwx 1 root root 6 Feb 23 17:42
> console -> ttySC0
> crwxrwxrwx 1 root root 1, 2 Feb 22 13:51 kmem
> crwxrwxrwx 1 root root 255, 255 Feb 22 13:51 log
> crwxrwxrwx 1 root root 1, 1 Feb 22 13:51 mem
> crwxrwxrwx 1 root root 1, 3 Feb 22 13:51 null
> lrwxrwxrwx 1 root root 4 Feb 22 13:52 ram -> ram0
> brwxrwxrwx 1 root root 1, 0 Feb 22 13:50 ram0
> crwxrwxrwx 1 root root 5, 0 Feb 22 14:49 tty
> crwxrwxrwx 1 root root 204, 8 Feb 22 13:56 ttySC0
> --------------------------------------------------------------
> --------------
>
> as INIT program I'm starting:
>
> --------------------------------------------------------------
> --------------
> -----
>
> #include<stdio.h>
> #include<sys/types.h>
> #include<fcntl.h>
> int main (void)
> {
> int i,fd;
>
> for(fd=0;;fd++)
> {
>
> printf("hello %d \n",fd);
>
> }
> fflush(NULL);
>
> return 1;
> }
> --------------------------------------------------------------
> --------------
>
> so I get following boot messages on my terminal:
>
> --------------------------------------------------------------
> --------------
> -
>
> Linux version 2.4.0-test11 (root@capella) (gcc version 2.97 20001120
> (experiment
> al)) #190 Fri Feb 23 17:44:50 MET 2001
> On node 0 totalpages: 4096
> zone(0): 4096 pages.
> zone(1): 0 pages.
> zone(2): 0 pages.
> Kernel command line: console=ttySC0,38400
> SH RTC: invalid value, resetting to 1 Jan 2000
> CPU clock: 75.17MHz
> Bus clock: 25.05MHz
> Module clock: 25.05MHz
> Interval = 62650
> Memory: 14216k/16384k available (648k kernel code, 2168k
> reserved, 24k data,
> 28k
> init)
> Dentry-cache hash table entries: 2048 (order: 2, 16384 bytes)
> Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
> Page-cache hash table entries: 4096 (order: 2, 16384 bytes)
> Inode-cache hash table entries: 1024 (order: 1, 8192 bytes)
> CPU: SH7707/SH7708/SH7709
> POSIX conformance testing by UNIFIX
> Linux NET4.0 for Linux 2.4
> Based upon Swansea University Computer Society NET3.039
> Starting kswapd v1.8
> RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
> RAMDISK: ext2 filesystem found at block 0
> RAMDISK: Loading 1024 blocks [1 disk] into ram disk... done.
> Freeing initrd memory: 1024k freed
> SuperH SCI(F) driver initialized
> ttySC0 at 0xfffffe80 is a SCI
> ttySC1 at 0xa4000150 is a SCIF
> ttySC2 at 0xa4000140 is a SCIF
> NET4: Linux TCP/IP 1.0 for NET4.0
> IP Protocols: ICMP, UDP, TCP
> IP: routing cache hash table of 512 buckets, 4Kbytes
> TCP: Hash tables configured (established 1024 bind 1024)
> VFS: Mounted root (ext2 filesystem).
> Freeing unused kernel memory: 28k freed
> sci open
> set real termios
> baud - 38400
> sci open
> baud - 38400
> *** Before INIT ***
> Hello world
> Hello world 2
> hello 0
> hello 1
> hello 2
> hello 3
> hello 4
> hello 5
> [...]
> hello 17
> hello 18
> hello 19
> hello 20
> hello 21
> hello 22
> hello 23
> hello 24
>
> ----------------------------------------------------------------------
>
> as you can see, my program stops at "hello 24" . I don't know
> why :) That's
> perhaps stupid, but I'm tring last days to get the reason of this
> behaviour...
> Serial console transmits only a certain number of chars or
> console works
> properly only certain period???
>
> with older kernels I had the same problem,nearly the
> same...Once, my program
> was to short (5 steps in "for" loop), so it has been
> "killed", before he
> could send all strings to console.
> But this time, the loop is endless!
> could this a problem with glibc-2.2.2? my next step will be
> change the Glibc
> to older one...
> but perhaps could you advice me something??
>
> have a nice weekend
> Pawel
>
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>
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