Evalution board

[Barisa Kisku]

HI,
Can anyone help me getting any evaluation board or any board for learning
purpose, based on freescale powerpc processor
with ethernet, HDLC etc interface.I want port Linux.

thanks in advance.

thanks and regards,
Barisa Kisku
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which data structure keep IO information.

[Barisa Kisku]

Hi,
I have to port one customised layer 2 protocol stack and  read, write system
call to access devices in linux-2.4.
At the moment  this is ported in UNIX SVR2/4 operating system.this protocol
uses some common data structure,
i.e "user" in unix srv2/4, which keeps information such as
  u_error = return errorn code
  u_base = base address for I/O
 u_count = bytes remaining for I/O
 u_arg = argument to current system call etc.

so i need to store these information in linux-2.4 implementation for
implementing read/write system calls.so what is/are
corresponding structure in linux-2.4.i went through task_struct, fs_struct,
files_struct etc., but couldn't relate it properly.

Please help me on this .

thanks and regards,
Barisa Kisku
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what is difference between interrupt context and process context?

[Barisa Kisku]

Hi,

What is difference between interrupt context and process
context.Fromhardware(register context) view
how they are different.In linux-2.6 interrupt stack is separate from kernel
stack.How interrupt stack pointer
is retrieved?How is the implementation in freescale ppc/powerpc.

please comment.

thanks in advance.

Barisa Kisku
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Whether kernel page table is loaded in exception handler?

[Barisa Kisku]

Hi,
Whether kernel page table is loaded during the execution of exception
handling.I tried to understand that bit code, but could n't find out  during
the execution of system call exception handling or  external interrupt
exception handling.


thanks in advance.

Barisa Kisku
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Kernel function having physical address. how?

[Barisa Kisku]

hi,

I have  ported linux-2.6.20 in cutom board based on MPC860.Kernel with the
KERNELBASE as default 0xc.
uImage is downloaded at some address and booted with "bootm"
command.Kernelis uncompressed and  loaded at
0x.All  the kernel function is now having physical address  (e.g.
0x20c8 instead of 0xc00020c8, which
is given by compiler).I think this required, to run kernel before MMU is on,
but how  this change in assembled code happens.
Does u-boot do this when uncompressing and loading the kernel. Please
comment.

thanks in advance.

Barisa
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Re: a question about mpc8xx linux

[Barisa kisku]

how do you know execution stop at "rfi" instruction.i think it seems it stop at 
"rfi"  instruction when debugging through debugger, but it does n't . you check 
it by putting break point in the later functions e.g start_here, machine_init 
etc.
   
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NFS mounting problem in mpc860 based board

[Barisa kisku]

hi,

I have ported u-boot 1.1.6 in a custom board based on
mpc860.using "tftpboot" command Linux kernel uImage is
downloaded.And it was run with "bootm" command and
controls are transfered to linux properly.

While kernel is mounting root file system through nfs
it is not able to send the message properly.By
observing through "Ethereal" at server machine, no ARP
message is reaching.

Print coming in console of embedded system is:
portmap: "Unable to get port number for  nfsd of
server"

But i am able to mount the file system in the given
server from other machine in the LAN.

Again by looking at the status of the BDs it seems
that the ethernet driver is sending message properly
to the LAN.

If anybody has come across this type of problem,
please help me in debugging.

Thanks in advance.

Regards,
Barisa Kisku








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