In rtl22xx bsp,why .text in sdram in link cmd

[invent-lwj]

(1)why the section .text in sdram.
(2)do rtems run in sdram? how it copy the kernel from flash into sdram?
(3)int boot_card(int argc, char **argv, char **envp)
what's the three parameter means about? did the envp is from r2(in start.S) pass to here?
 
                                                            thanks!
                                                             best regard!
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