HELP:PowerPc-Linux kernel
naresh.kamboju at wipro.com
naresh.kamboju at wipro.com
Sat Jul 30 22:21:10 EST 2011
Hi All,
I have started working on powerpc board bring up. I have prepared dtb file and booted linux kernel with my debug statement.
Problem:
I could not see anything on the serial console. By using the emulator I can read __log_buf and found below info.
How can I initialize the serial console?
Here "ttyCPM0 at MMIO map 0xc504aa00 mem 0x0 (irq = 40) is a CPM UART" is detected by kernel and where we generally pass boot args as ttyS0.
May I the relation between ttyCPM0 and ttyS0.
How can I see kernel boot console on the serial port? It would be helpful if you share any workarounds.
Below print out is from emulator by reading __log_buf and parsed as readable log.
<6>Using MPC82xx ADS machine description
.<3>Initializing container subsys cpu.
<5>Linux version 2.6.21.7-hrt1-cfs-v22-grsec-WR2.0bl_cgl (vanga at linux) (gcc version 4.1.2 (Wind River Linux Sourcery G++ 4.1-91)) #18 Sat Jul 30 14:39:06 IST 2011
.<7>Entering add_active_range(0, 0, 16384) 0 entries of 256 used
.<6>No memory reg property [1] in devicetree
.<7>Top of RAM: 0x4000000, Total RAM: 0x4000000
.<7>Memory hole size: 0MB
.<4>Zone PFN ranges:
.<4> DMA 0 -> 16384
.<4> Normal 16384 -> 16384
.< 4>early_node_map[1] active PFN ranges
.<4> 0: 0 -> 16384
.<7>On node 0 totalpages: 16384
.<7> DMA zone: 128 pages used for memmap
.<7> DMA zone: 0 pages reserved
.<7> DMA zone: 16256 pages, LIFO batch:3
.<7> Normal zone: 0 pages used for memmap. <4>Built 1 zonelists. Total pages: 16256.
<5>Kernel command line: mem=64M console=ttyS0,9600n8 root=/dev/nfs rw nfsroot=172.16.50.152:/home/export,nolock,rsize=1024,wsize=1024.
<5>---after parse_early_param------- .
<5>---after parse_args------- .
<5>entered sort_main_extable
<5>exit sort_main_extable
<5>---after sort_main_extable()------- .
<5>---after trap_init()------- .
<5>---after rcu_init()-------
.<6>No pci node on device tree.
<5>---after init_IRQ()-------
.<4>PID hash table entries: 256 (order: 8, 1024 bytes).
<5>---after pidhash_init------- .
<5>---after init_timers------- .
<5>---after hrtimers_init------- .
<5>---after softirq_init------- .
<5>---after timekeeping_init-------
.<7>time_init: decrementer frequency = 16.675000 MHz
.<7>time_init: processor fre quency = 166.750000 MHz.
<5>---after time_init------- .
<5>---after profile_init------- .
<5>---after early_boot_irqs_on------- .
<5>---after local_irq_enable-------
.<6>---entered in cpm_uart_console_init -- .
<5>---after console_init------- .
<5>---after pan ic check------- .
<5>---after lockdep_info------- .
<5>---after locking_selftest-------
.<4>Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
.<4>Inode-cache hash table entries: 4096 (order: 2, 16384 bytes).
<5>---after vfs_caches_init_early------- .
<5>---cpuset_init_early-------
.<6>Memory: 61612k/65536k available (2848k kernel code, 3860k reserved, 84k data, 276k bss, 152k init).
<5>---after kmem_cache_init------- .
<5>---after locking_selftest------- .
<5>---after radix_tree_init------- .
<5>---after memleak_init------- .
<5>---after setup_per_cpu_pageset------- .
<5>---after numa_policy_init------- .
<5>---after late_time_init------
.<7>Calibrating delay loop... 33.28 BogoMIPS (lpj=66560).
<5>---after calibrate_delay------- .
<5>---after pidmap_init------ - .
<5>---after pgtable_cache_init------- .
<5>---after prio_tree_init------- .
<5>---after anon_vma_init------- .
<5>---after fork_init------- .
<5>---after proc_caches_init------- .
<5>---after buffer_init------- .
<5>---after unnamed_dev_init------- .
<5>---aft er key_init------- .
<5>---after security_init-------
.<4>Mount-cache hash table entries: 512.
<5>---after vfs_caches_init------- .
<5>---after signals_init------- .
<5>---after page_writeback_init-------
.<3>Initializing container subsys cpuacct
.<3>Initializi ng container subsys debug.
<5>---after container_init------- .
<5>---after cpuset_init------- .
<5>---after taskstats_init_early------ .
<5>---after delayacct_init------- .
<5>---after check_bugs------- .
<5>---after acpi_early_init-------
.<6>-------entry rest_ init--------
.<6>-------kernel_thread --------
.<6>----------after numa_default_policy---------
.<6>-----unlock_kernel--------
.<6>------------init_idle_bootup_task---------
.<6>--------preempt_enable_no_resched------
.<6>NET: Registered protocol family 16
.<6>PC I: Probing PCI hardware
.<6>Generic PHY: Registered new driver
.<6>NET: Registered protocol family 2
.<6>------------after schedule---------
.<6>----------preempt_disable-------.
<5>-----entered cpu_idle -------
<5>-----entered cpu_idle set_thread_flag -------I P route cache hash table entries: 1024 (order: 0, 4096 bytes)
.<4>TCP established hash table entries: 2048 (order: 2, 16384 bytes)
.<4>TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
.<6>TCP: Hash tables configured (established 2048 bind 2048)
.<6>TCP reno registered
.<6>JFS: nTxBlock = 481, nTxLock = 3854
.<6>Time: timebase clocksource has been installed.
.<6>Switched to high resolution mode on CPU 0
.<6>Registering unionfs 2.1.6 (for 2.6.21.7)
.<6>io scheduler noop registered
.<6>Generic RTC Driver v1.07
.< 3>i8042.c: No controller found.
.<6>Serial: CPM driver $Revision: 0.02 $
.<6>--cpm_uart_init()---dev = C07E6C08
.<6>--uart_register_driver() ---ret = 0--
.<6>cpm_uart_drv_probe: Adding CPM UART 0
.<6>CPM uart[0]:config_port
.<6>:CPM uart[0]:request port
.<6>pinfo->sccp->scc_sccm
.<6>CPM uart[0]:allocbuf
.<6>CPM uart[0]:init_scc
.<6>ttyCPM0 at MMIO map 0xc504aa00 mem 0x0 (irq = 40) is a CPM UART
.<4>RAMDISK driver initialized: 16 RAM disks of 32768K size 1024 blocksize
.<4>Default I/O scheduler not found, using no- op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<4>Default I/O scheduler not found, using no-op
.<6>nbd: registered device at major 43
.<6>Broa dcom BCM5411: Registered new driver
.<6>Broadcom BCM5421: Registered new driver
.<6>Broadcom BCM5461: Registered new driver
.<6>fs_enet.c:v1.0 (Aug 8, 2005)
.<3>BB MII Bus: Cannot register as MDIO bus
.<4>fsl-bb-mdio: probe of fsl-bb-mdio.0 failed with error -1
.<3>BB MII Bus: Cannot register as MDIO bus
.<4>fsl-bb-mdio: probe of fsl-bb-mdio.1 failed with error -1
.<6>No memory reg property [1] in devicetree
.<6>No memory reg property [1] in devicetree
.<6>i2c /dev entries driver.
<5>physmap platform flash device: 020 00000 at fe000000
.<6>physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank.
<5>Support for command set 0002 not present
.<4>gen_probe: No supported Vendor Command Set found
.<3>physmap-flash physmap-flash.0: map_probe failed
.<6>TCP cubic registered
.<6>Initializing XFRM netlink socket
.<6>NET: Registered protocol family 1
.<6>NET: Registered protocol family 17
.<6>NET: Registered protocol family 15
.<6>802.1Q VLAN Support v1.8 Ben Greear <greearb at candelatech.com>
.<6>All bugs added by David S. Miller <davem at red hat.com>.
<5>Looking up port of RPC 100003/2 on 172.16.50.152....
Best regards
Naresh Kamboju
-----Original Message-----
From: Vijay Nikam [mailto:vijay.t.nikam at gmail.com]
Sent: Thursday, July 28, 2011 10:16 AM
To: Naresh Kamboju (WT01 - GMT-Telecom Equipment)
Cc: linuxppc-dev at lists.ozlabs.org; cort at fsmlabs.com; linas at austin.ibm.com; hollis at austin.ibm.com
Subject: Re: HELP:PowerPc-Linux kernel
Hello,
Start with looking at the configuration of the board done which is
similar to yours
or based on the same CPU as yours. It is important to know role of
device tree so
read the documentation and understand the syntax and concept of device
tree. Once
the complete concept is understood then you should start the
configuration and achieve
successful creation of kernel image.
Take a step forward and do some hands on. If any problem occurs then
post for specific help,
as porting itself is a big task and dosent have really straight forward steps.
Good Luck
Kind Regards,
Vijay Nikam
On Wed, Jul 27, 2011 at 8:33 PM, <naresh.kamboju at wipro.com> wrote:
>
> Hi,
>
>
>
> I have take up the new assignment Board bring up activity with Linux kernel on PowerPC MPC8272.
>
> I have been searching Linux bring up on PowerPC processor in Google and IBM wiki and not found good stuff.
>
> It would be more helpful for me if you could share related documents.
>
>
>
> Best regards
>
> Naresh Kamboju
>
>
>
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