The question about the high memory support on MPC8360?
vijay baskar
cn.vijaibaskar at gdatech.co.in
Mon Nov 26 17:11:38 EST 2007
Hi friends,
Kernel virtual space is divided into 3 different zones namely ZONE_DMA,
ZONE_NORMAL, ZONE_HIGHMEM.Remember that the kernel follows the 3GB/1GB
split ie 3 GB for user space and 1 GB for kernel space. Since your ram
is 1 GB, 896 MB will be mapped one to one with the kernel virtual space.
This one to one mapping will be done in the ZONE_NORMAL and ZONE_DMA of
kernel virtual space.Remaining 128 MB of kernel virtual address space
will be used for setting up kernel data structures and for ioremaps and
vmallocs that the kernel will need to perform during boot up. If u
configure high memory this 128 MB will be used for accessing unmapped
memory regions in the ram and there wont be sufficient virtual
addresses for ioremaps and vmallocs. Thats why your kernel did not boot
when high mem is configured.
Since u want to have 1 GB of ram an alternative to
this is that u can try 2 GB/ 2 GB split which is configurable ie 2 GB
for user space and 2 GB for kernel space in your kernel.
Thanks and Regards,
vijai
郭劲 wrote:
>Hi,friends,
> I plug in 1GB DDR-1 on my MPC8360 board, the u-boot-1.2.0 found the DDR storage
>is 1GB, but the linux just found 773504k. please see follow information.
> I think I need to config the kernel to support the high memory. but if I config
>the kernel to select the "high memory support" under the "platform options" on
>"linux kernel configuration" during compile, the kernel is not to boot. if I
>cancel this options, the kernel is ok to run.
> why? how to deal with this problem? there are two DIMM-184 slots on my MPC8360
>board, I want to support total 2GB DDR-1 storage. now I want to try 1GB on one of
>DIMM-184 slots firstly.
> please see follow information. Thanks.
>
>
>~ # dmesg
>Linux version 2.6.11 (olivia at bamboo) (gcc version 3.4.3) #1 Thu Jul 12 14:29:297
>On node 0 totalpages: 196608
> DMA zone: 196608 pages, LIFO batch:16
> Normal zone: 0 pages, LIFO batch:1
> HighMem zone: 0 pages, LIFO batch:1
>Built 1 zonelists
>Kernel command line: console=ttyS0,115200 root=/dev/ram0
>IPIC (128 IRQ sources, 8 External IRQs) at fe000700
>QE IC (64 IRQ sources) at fe100080
>PID hash table entries: 4096 (order: 12, 65536 bytes)
>Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
>Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
>Memory: 773504k available (1724k kernel code, 432k data, 100k init, 0k highmem)
>Calibrating delay loop... 351.23 BogoMIPS (lpj=175616)
>Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
>checking if image is initramfs...it isn't (no cpio magic); looks like an initrd
>Freeing initrd memory: 3120k freed
>NET: Registered protocol family 16
>Registering ipic with sysfs...
>SCSI subsystem initialized
>JFFS2 version 2.2. (C) 2001-2003 Red Hat, Inc.
>Generic RTC Driver v1.07
>Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
>ttyS0 at MMIO 0xe0004500 (irq = 9) is a 16550A
>ttyS1 at MMIO 0xe0004600 (irq = 10) is a 16550A
>io scheduler noop registered
>io scheduler anticipatory registered
>io scheduler deadline registered
>io scheduler cfq registered
>RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
>loop: loaded (max 8 devices)
>MPC8360E PB flash device: 2000000 at fe000000 Partition number 6
>MPC8360E PB Flash Map Info: Found 1 x16 devices at 0x0 in 16-bit bank
>MPC8360E PB Flash Map Info: Found an alias at 0x1000000 for the chip at 0x0
>Support for command set 0001 not present
>gen_probe: No supported Vendor Command Set found
>i2c /dev entries driver
>eth0: Running with NAPI disabled
>eth1: Running with NAPI disabled
>NET: Registered protocol family 2
>IP: routing cache hash table of 8192 buckets, 64Kbytes
>TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
>TCP bind hash table entries: 65536 (order: 6, 262144 bytes)
>TCP: Hash tables configured (established 131072 bind 65536)
>NET: Registered protocol family 1
>NET: Registered protocol family 17
>RAMDISK: Compressed image found at block 0
>VFS: Mounted root (ext2 filesystem) readonly.
>Freeing unused kernel memory: 100k init
>eth0: PHY is Marvell 88E11x1 (1410cc1)
>eth0: Full Duplex
>eth0: Speed 1000BT
>eth0: Link is up
>
>
>U-Boot 1.2.0 (Nov 21 2007 - 16:05:15) MPC83XX
>
>CPU: e300c1, MPC8360E, Rev: 20 at 528 MHz, CSB: 264 MHz
>Board: Freescale MPC8360EMDS
>I2C: ready
>DRAM:
>DIMM type:
>SPD size: 128
>EEPROM size: 256
>Memory type: 7
>Row addr: 13
>Column addr: 11
># of rows: 2
>Row density: 128
># of banks: 4
>Data width: 64
>Chip width: 8
>Refresh rate: 82
>CAS latencies: 1C
>Write latencies: 02
>tRP: 60
>tRCD: 60
>
>
> DDR DIMM: data bus width is 64 bit without ECC
> DDRC ECC mode: OFF
>
> SDRAM on Local Bus: 64 MB
> DDR RAM: 1024 MB
>FLASH: 16 MB
>PCI clock is 66MHz
>PCI 32bit bus on PMC1 & PMC2 & PMC3
>In: serial
>Out: serial
>Err: serial
>Net: UEC: PHY is Marvell 88E11x1 (1410cc1)
>FSL UEC0: Full Duplex
>FSL UEC0: Speed 1000BT
>FSL UEC0: Link is up
>FSL UEC0
>Hit any key to stop autoboot: 0
>=> bootm fed00000 fe900000
>## Booting image at fed00000 ...
> Image Name: Linux-2.6.11
> Image Type: PowerPC Linux Kernel Image (gzip compressed)
> Data Size: 1054435 Bytes = 1 MB
> Load Address: 00000000
> Entry Point: 00000000
> Verifying Checksum ... OK
> Uncompressing Kernel Image ... OK
>## Loading RAMDisk Image at fe900000 ...
> Image Name: uboot ext2 ramdisk rootfs
> Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
> Data Size: 3195657 Bytes = 3 MB
> Load Address: 00000000
> Entry Point: 00000000
> Verifying Checksum ... OK
> Loading Ramdisk to 0fc9a000, end 0ffa6309 ... OK
>
>
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