Re: [rowboat] u-boot command

[hedwin]

Info you can find in any c book.
That said;

## is concatenate
# is stringfy

In you case it would look like this

cmd_tbl_t __u_boot_cmd_mtest Struct_Section = {"mtest", 5, 1,  do_mem_mtest, "simple RAM read/write test", "[start [end [pattern [iterations]]]]"}

This struct is placed in its own section because u-boot internals can than easily refer to this section to read/use the uboot commands.

On Tue, Apr 24, 2012 at 6:19 AM, venkat k raju <kvraj...@gmail.com> wrote:

Hi all,

i want to implement my own u-boot commands,so i gone through the u-boot source code i got this interface to build the u-boot commands.

U_BOOT_CMD(

        mtest,  5,      1,      do_mem_mtest,

        "simple RAM read/write test",

        "[start [end [pattern [iterations]]]]"

);

please can anybody explain me below chunk of code 

#define U_BOOT_CMD(name,maxargs,rep,cmd,usage,help) \

cmd_tbl_t __u_boot_cmd_##name Struct_Section = {#name, maxargs, rep, cmd, usage, help}

 #define Struct_Section  __attribute__ ((unused,section (".u_boot_cmd")))

here cmd_tbl_t is a structure 

thanks in advance!!

thanks&Regards
k.v.raju

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[hedwin]

Indeed.

So basically the uboot commands are stored in a segment called .u_boot_cmd. When you enter a command on the command line u-boot will check if
the command is listed in this section (a bit of simplified comment) . If true it will execute the function that is assigned to the cmd field. In your case it
will execute do_mem_test. It is up to the cmd function to handle/verify the arguments, u-boot only passes them.

On Tue, Apr 24, 2012 at 2:50 PM, venkat k raju <kvraj...@gmail.com> wrote:

Hi hedwin,

thank you.

#define Struct_Section __attribute__ ((unused,section (".u_boot_cmd"))) 

then this should be something like this right!

cmd_tbl_t __u_boot_cmd_mtest  __attribute__ ((unused,section (".u_boot_cmd"))) = {"mtest", 5, 1,  do_mem_mtest, "simple RAM read/write test", "[start [end [pattern [iterations]]]]"}

i am sorry i am poor in this concepts , please can you tell me what actually is going on...

--
thanks&Regards
k.v.raju

[venkat k raju]

[venkat k raju]

Hi hedwin,

thank you.

#define Struct_Section __attribute__ ((unused,section (".u_boot_cmd"))) 

then this should be something like this right!

cmd_tbl_t __u_boot_cmd_mtest  __attribute__ ((unused,section (".u_boot_cmd"))) = {"mtest", 5, 1,  do_mem_mtest, "simple RAM read/write test", "[start [end [pattern [iterations]]]]"}

i am sorry i am poor in this concepts , please can you tell me what actually is going on...

On Tue, Apr 24, 2012 at 5:35 PM, hedwin <hedwin...@gmail.com> wrote:

--
thanks&Regards
k.v.raju