Hi ,
Are u having a call to io_block_mapping () in ur
arch/ppc/platfrom/<board_setup.c> covering the PKMAP_BASE ( 0xfe000000) when
using a kernel configured with CONFIG_HIGHMEM ?
The io_block_mapping will be used by you to get the early serial messages on
the console.
Read the mail from Mark below
http://lists.linuxppc.org/linuxppc-embedded/200307/msg00018.html
regards
>From: "Karoliya, Abhishek" <Abhishek.Karoliya at fci.com>
>To: linuxppc-embedded at lists.linuxppc.org
>Subject: 2.4.18mvl30 & 1 GB Board
>Date: Fri, 31 Oct 2003 22:44:00 +0530
>
>
>Hi all,
>
> I am trying to bring up Linux {2.4.18 from MontaVista PE3.0 } on a 1GB
>of
>SDRAM board having 7447+MV64360 combination.
>With No high mem enabled in the kernel, it just hangs at saying freeing
>unused kernel memory . {Attached the dump and also bdi output when it
>freezes}
>
>Enabling high mem support also yields similar results.
>
>However when the same board is configured as 512 MB by firmware {a
>proprietary one}, Linux comes properly to prompt.
>Shouldn't the board boot above in 1GB configuration properly with just 768
>MB of memory?
>My ultimate aim is to make the entire 1GB of memory useable , so I chose
>this as the first step to that end.
>
>Please provide some pointers in this direction.
>
>Thanks a lot
>Abhishek
>
>********** Kernel Dump **********
> Memory BAT mapping: BAT2=256Mb, BAT3=256Mb,
>residual
>: 512Mb
>Warning, memory limited to 768 Mb, use CONFIG_HIGHMEM to reach 1024 Mb
>Total memory = 768MB; using 2048kB for hash table (at c0200000)
>Linux version 2.4.18_mvl30 (abhishek at idc_linux_bld01.in.fci.com) (gcc
>version 3.
>2.1 20020930 (MontaVista)) #7 Fri Oct 31 20:11:06 IST 2003
>Force PPMC280 Development Board
>On node 0 totalpages: 196608
>zone(0): 196608 pages.
>zone(1): 0 pages.
>zone(2): 0 pages.
>Kernel command line: console=ttyS0,115200 root=/dev/ram
>mtdparts=0:3072k(kernel)
>,22528k(Ramdisk),39680k(JFFS2)
>time_init: decrementer frequency = 33.250000 MHz
>Calibrating delay loop... 663.55 BogoMIPS
>Memory: 750264k available (992k kernel code, 408k data, 176k init, 0k
>highmem)
>Dentry-cache hash table entries: 131072 (order: 8, 1048576 bytes)
>Inode-cache hash table entries: 65536 (order: 7, 524288 bytes)
>Mount-cache hash table entries: 16384 (order: 5, 131072 bytes)
>Buffer-cache hash table entries: 65536 (order: 6, 262144 bytes)
>Page-cache hash table entries: 262144 (order: 8, 1048576 bytes)
>POSIX conformance testing by UNIFIX
>PCI: Probing PCI hardware
>PCI: Cannot allocate resource region 2 of device 00:00.0
>PCI: Cannot allocate resource region 4 of device 00:00.0
>PCI: Cannot allocate resource region 4 of device 00:00.1
>PCI: Cannot allocate resource region 0 of device 00:00.2
>PCI: Cannot allocate resource region 2 of device 00:00.2
>PCI: Cannot allocate resource region 4 of device 00:00.3
>PCI: Cannot allocate resource region 5 of device 00:00.4
>Linux NET4.0 for Linux 2.4
>Based upon Swansea University Computer Society NET3.039
>Initializing RT netlink socket
>Starting kswapd
>Disabling the Out Of Memory Killer
>i2c-core.o: i2c core module version 2.6.2 (20011118)
>pty: 256 Unix98 ptys configured
>block: 128 slots per queue, batch=32
>RAMDISK driver initialized: 16 RAM disks of 131072K size 1024 blocksize
>loop: loaded (max 8 devices)
>Intel(R) PRO/1000 Network Driver - version 4.3.2-k1
>Copyright (c) 1999-2002 Intel Corporation.
>i2c-algo-mv64360: I2C MV64360 Module
>AT24C64 EEPROM detected.
>Intializing AT24CXX eeprom driver.
>Initializing MAX9600 RTC driver.
>NET4: Linux TCP/IP 1.0 for NET4.0
>IP Protocols: ICMP, UDP, TCP, IGMP
>IP: routing cache hash table of 8192 buckets, 64Kbytes
>TCP: Hash tables configured (established 262144 bind 65536)
>NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
>RAMDISK: Compressed image found at block 0
>Freeing initrd memory: 20198k freed
>EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
>VFS: Mounted root (ext2 filesystem).
>Freeing unused kernel memory: 176k init
>
><<<< just hangs here >>>>>>>>
>
>*********BDI Dump when it hangs *********
>
>BDI>halt
> Target CPU : MPC7457 Rev.1
> Target state : debug mode
> Debug entry cause : instruction address breakpoint
> Current PC : 0xfffffffc
> Current CR : 0xffffffff
> Current MSR : 0xffffffbf
> Current LR : 0xffffffff
>BDI>r
>GPR00: 00000000 7ffffc30 00000000 00000000
>GPR04: 00000000 00000000 30026940 300030a8
>GPR08: 7ffffc50 00000000 00000000 00000000
>GPR12: 20000000 00000000 00000000 00000000
>GPR16: 00000000 00000000 00000000 00000000
>GPR20: 00000000 7ffffee0 7ffffe68 7ffffe6c
>GPR24: 7ffffe70 7ffffc38 00000000 00000000
>GPR28: 7ffffc38 00000000 30026940 00000000
>CR : ffffffff MSR: ffffffbf
>BDI>t
> Target CPU : MPC7457 Rev.1
> Target state : debug mode
> Debug entry cause : trace
> Current PC : 0xfffffffc
> Current CR : 0xffffffff
> Current MSR : 0xffffffbf
> Current LR : 0xfffffffc
>BDI>t
> Target CPU : MPC7457 Rev.1
> Target state : debug mode
> Debug entry cause : program exception
> Current PC : 0xfffffffc
> Current CR : 0xffffffff
> Current MSR : 0xffffffbf
> Current LR : 0xfffffffc
># Step timeout detected
>BDI>t
> Target CPU : MPC7457 Rev.1
> Target state : debug mode
> Debug entry cause : COP freeze (startup)
> Current PC : 0xfffffffc
> Current CR : 0xffffffff
> Current MSR : 0xffffffbf
> Current LR : 0xfffffffc
># Step timeout detected
>BDI>t
> Target CPU : MPC7457 Rev.1
> Target state : debug mode
> Debug entry cause : COP freeze (startup)
> Current PC : 0xfffffffc
> Current CR : 0xffffffff
> Current MSR : 0xffffffbf
> Current LR : 0xfffffffc
># Step timeout detected
>BDI>go
>BDI>halt
> Target CPU : MPC7457 Rev.1
> Target state : debug mode
> Debug entry cause : COP freeze (startup)
> Current PC : 0xfffffffc
> Current CR : 0xffffffff
> Current MSR : 0xffffffbf
> Current LR : 0xfffffffc
>
>
>
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