2009-03-12 05:29:33     mmap

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2009-03-12 05:29:33     mmap

Daniele Pagani (ITALY)

Message: 70838   


Dear Sirs,


according to:




I use mmap function.


If I use on 2008R1.5-RC3 the bootargs with maxmem=32M and mem=28M then I can mmap this free space.


In my driver I do a printk of:


_ramend and physical_mem_end and all works fine.


If I do the same think with 2009 live distribution (with the same u-boot), then I find:


_ramend = physical_mem_end, so I can not use the free space.


So, the question is, how can I use mmap reserving memory with u-boot in uClinux 2009 live distribution?


uclinux 7862


linux 6164


Best regards,






2009-03-12 06:15:58     Re: mmap

Mike Frysinger (UNITED STATES)

Message: 70843   


post the full boot output of the non-working kernel




2009-03-12 06:59:42     Re: mmap

Daniele Pagani (ITALY)

Message: 70848   


Linux version (root@linux-fbdo) (gcc version 4.1

.2 (ADI svn)) #18 Wed Mar 11 12:08:50 CET 2009

console [early_BFuart0] enabled

early printk enabled on early_BFuart0

Warning: limiting memory to 19MB due to hardware anomaly 05000263

Board Memory: 20MB

Kernel Managed Memory: 20MB

Memory map:

  fixedcode = 0x00000400-0x00000490

  text      = 0x00001000-0x0010c480

  rodata    = 0x0010c480-0x0015aea0

  bss       = 0x0015aea0-0x0016983c

  data      = 0x0016983c-0x0017a000

    stack   = 0x00178000-0x0017a000

  init      = 0x0017a000-0x00465000

  available = 0x00465000-0x012ff000

  DMA Zone  = 0x01300000-0x01400000

Hardware Trace Active and Enabled

Boot Mode: 0

Blackfin support (C) 2004-2009 Analog Devices, Inc.

Compiled for ADSP-BF537 Rev 0.2

Blackfin Linux support by http://blackfin.uclinux.org/

Processor Speed: 500 MHz core clock and 100 MHz System Clock


boot memmap: 0000000000465000 - 00000000012ff000 (usable)

On node 0 totalpages: 4863

free_area_init_node: node 0, pgdat 001762ac, node_mem_map 0046a000

  DMA zone: 38 pages used for memmap

  DMA zone: 0 pages reserved

  DMA zone: 4825 pages, LIFO batch:0

  Normal zone: 0 pages used for memmap

  Movable zone: 0 pages used for memmap

NOMPU: setting up cplb tables

Instruction Cache Enabled for CPU0

Data Cache Enabled for CPU0 (write-back)

Built 1 zonelists in Zone order, mobility grouping off.  Total pages: 4825

Kernel command line: root=/dev/mtdblock0 rw earlyprintk=serial,uart0,115200 cons

ole=ttyBF0,115200 maxmem=24M mem=20M

Configuring Blackfin Priority Driven Interrupts

PID hash table entries: 128 (order: 7, 512 bytes)

console handover: boot [early_BFuart0] -> real [ttyBF0]

Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)

Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)

Kernel managed physical pages: 4863

Memory available: 14652k/20480k RAM, (2988k init code, 1069k kernel code, 439k d

ata, 1024k dma, 308k reserved)

Calibrating delay loop... 997.37 BogoMIPS (lpj=1994752)


Security Framework initialized

Mount-cache hash table entries: 512

Blackfin Scratchpad data SRAM: 4 KB

Blackfin L1 Data A SRAM: 16 KB (15 KB free)

Blackfin L1 Data B SRAM: 16 KB (16 KB free)

Blackfin L1 Instruction SRAM: 48 KB (41 KB free)

PDA for CPU0 reserved at 0015bed0

net_namespace: 288 bytes

NET: Registered protocol family 16

Blackfin GPIO Controller

Blackfin DMA Controller

stamp_init(): registering device resources

NET: Registered protocol family 2

IP route cache hash table entries: 1024 (order: 0, 4096 bytes)

TCP established hash table entries: 1024 (order: 1, 8192 bytes)

TCP bind hash table entries: 1024 (order: 0, 4096 bytes)

TCP: Hash tables configured (established 1024 bind 1024)

TCP reno registered

NET: Registered protocol family 1

Setting up Blackfin MMR debugfs

msgmni has been set to 28

io scheduler noop registered

io scheduler anticipatory registered (default)


io scheduler cfq registered

simple-gpio: now handling 48 GPIOs: 0 - 47

Serial: Blackfin serial driver

bfin-uart.1: ttyBF0 at MMIO 0xffc00400 (irq = 18) is a BFIN-UART

brd: module loaded

bfin_mii_bus: probed

bfin_mac: attached PHY driver [Generic PHY] (mii_bus:phy_addr=0:03, irq=-1, mdc_


bfin_mac bfin_mac.0: Blackfin on-chip Ethernet MAC driver, Version 1.1

physmap platform flash device: 00400000 at 20000000

physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank

Amd/Fujitsu Extended Query Table at 0x0040

number of CFI chips: 1

cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.

RedBoot partition parsing not available

Using physmap partition information

Creating 3 MTD partitions on "physmap-flash.0":

0x00000000-0x00040000 : "bootloader(nor)"

0x00040000-0x003f0000 : "Linux"

0x003f0000-0x00400000 : "MAC Address(nor)"

bfin-spi bfin-spi.0: Blackfin on-chip SPI Controller Driver, Version 1.0, regs_b

ase@ffc00500, dma channel@7

i2c /dev entries driver


i2c-bfin-twi i2c-bfin-twi.0: Blackfin BF5xx on-chip I2C TWI Contoller, regs_base


TCP cubic registered

NET: Registered protocol family 17

Distributed Switch Architecture driver version 0.1

eth0: detected a KSZ8893M switch

dsa slave smi: probed

Freeing unused kernel memory: 2988k freed

dma_alloc_init: dma_page @ 0x00460000 - 256 pages at 0x01300000






2009-03-12 07:00:54     Re: mmap

Daniele Pagani (ITALY)

Message: 70849   


bootargs=root=/dev/mtdblock0 rw earlyprintk=serial,uart0,115200 console=ttyBF0,1

15200 maxmem=24M mem=20M




2009-03-12 07:08:20     Re: mmap

Mike Frysinger (UNITED STATES)

Message: 70851   


your command line is wrong.  you forgot the underscore in max_mem.