Re: Running a section of code from internal memory

[Sanal Kumar V K]

Thanks a lot Scott for replying. The attribute section is working, but one problem: the compiler is automatically assigning address for the section and ld returns error is I try to assign the address for this section in a linker script: Following is the disassembly when I don't specify an address for the same section name in the linker script: Disassembly of section .l2_scratch: 004ae820 <.l2_scratch>:   4ae820:       3c1c0fb9        lui     gp,0xfb9   4ae824:       279c1d90        addiu   gp,gp,7568   4ae828:       0399e021        addu    gp,gp,t9   4ae82c:       27bdffd0        addiu   sp,sp,-48   4ae830:       afbf0028        sw      ra,40(sp)   4ae834:       afbe0024        sw      s8,36(sp)   4ae838:       ----------      ----      ---------   And the section shows: Idx Name          Size      VMA       LMA       File off  Algn   0 .reginfo      00000018  00400094  00400094  00000094  2**2                   CONTENTS, ALLOC, LOAD, READONLY, DATA, LINK_ONCE_SAME_SIZE   1 .init         00000088  004000ac  004000ac  000000ac  2**2                   CONTENTS, ALLOC, LOAD, READONLY, CODE   2 .text         000ae6e0  00400140  00400140  00000140  2**4                   CONTENTS, ALLOC, LOAD, READONLY, CODE   3 .l2_scratch   000004f0  004ae820  004ae820  000ae820  2**2                   CONTENTS, ALLOC, LOAD, READONLY, CODE   4 -----      -------------------------------------------------------- Now if I make the following entry in the linker script,   /* define L2 scratch here */   . = 0x9FC16800;   .l2_scratch         : { *(.l2_scratch) } it says "collect2: ld returned 1 exit status". Is there any way I can assign address for the section used in attribute? Thanks and regards, Sanal Scott Wood wrote: On Thu, May 08, 2008 at 05:06:46PM +0530, Sanal Kumar V K wrote: A small part of the code needs to run from the on-chip "L2 scratch" for getting optimum performance. I would really appreciate if some could give me some pointers regarding the following questions: 1. Is #pragma section supported by gcc. The compiler prints this warning "ignoring #pragma section" and the pragma is ignored indicating that it is not supported. Is there any way I can get the pragma working for gcc or any alternative? __attribute__((section("section name"))) -Scott

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