Hi All,
So far I have my sc520 board booting into main_loop (), DRAM configured
and serial ports working. Now I seem to be stuck on getting commands
to execute (even help). Using printf() I have traced my problem into
find_cmd (). I added the following into find_cmd() just before the for
loop:
printf ("Searching for Command '%s'\n", cmd);
printf ("Command Table Start : %08lx\n", (ulong)&__u_boot_cmd_start);
printf ("Command Table End : %08lx\n", (ulong)&__u_boot_cmd_end);
printf ("sizeof(int) : %x\n", sizeof(int));
printf ("sizeof(cmd_tbl_t) : %x\n", sizeof(cmd_tbl_t));
and
printf ("Checking : %08lx\n", (ulong)cmdtp);
just inside the for loop
The output is (there are a few other printf()'s leadinf up to
find_cmd () as well):
boot > help
[RUN_COMMAND] cmd[00400ccc]="help"
[PROCESS_SEPARATORS] help
token: "help"
Processing Macros...
[PROCESS_MACROS] INPUT len 4: "help"
[PROCESS_MACROS] OUTPUT len 4: "help"
Extracting Arguments...
parse_line: "help"
parse_line: nargs=1
Looking up Command...
Searching for Command 'help'
Command Table Start : 0000053e
Command Table End : 00000870
sizeof(int) : 4
sizeof(cmd_tbl_t) : 18
Checking : 0000053e
Checking : 00000556
Checking : 0000056e
.
.
.
Checking : 00000856
Checking : 0000086e
Checking : 00000886
Checking : 0000089e
Checking : 000008b6
There are a few weird things going on...
a) sizeof(cmd_tbl_t) is 18, but the loop is incrementing by 24 (I would
have thought a 4 byte alignment would push it to 20 maybe)
b) The loop never completes since cmdtp never actually equals
&__u_boot_cmd_end
c) The bootrom flash is mapped to 0x38000000. The flash is 512k with
U-Boot image being 256k puts U-Boot at 0x38040000. I have adjusted
TEXT_BASE = 0x38040000 in config.mk and adjusted u-boot.lds (see
full u-boot.lds below) (for those that don't know the AMD sc520, the
boot flash memory region can be 'mapped' to wherever you want it,
and I have confirmed the mapping be dumping the address of the
last_stage_init() function which resides at 0x38046d57 - right were
I expect it). I would, therefore, expect the command table to live
somewhere in 0x38040000 - 0x3807ffff
Can anyone point me an a rough direction to look? Any help at all
would be greatly appreciated
Regards,
Graeme
u-boot.lds:
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(_start)
SECTIONS
{
. = 0x38040000; /* Where bootcode in the flash is mapped */
.text : { *(.text); }
. = ALIGN(4);
.rodata : { *(.rodata) *(.rodata.str1.1) *(.rodata.str1.32) }
. = 0x400000; /* Ram data segment to use */
_i386boot_romdata_dest = ABSOLUTE(.);
.data : AT ( LOADADDR(.rodata) + SIZEOF(.rodata) ) { *(.data) }
_i386boot_romdata_start = LOADADDR(.data);
. = ALIGN(4);
.got : AT ( LOADADDR(.data) + SIZEOF(.data) ) { *(.got) }
_i386boot_romdata_size = SIZEOF(.data) + SIZEOF(.got);
. = ALIGN(4);
_i386boot_bss_start = ABSOLUTE(.);
.bss (NOLOAD) : { *(.bss) }
_i386boot_bss_size = SIZEOF(.bss);
/* 16bit realmode trampoline code */
.realmode 0x7c0 : AT ( LOADADDR(.got) + SIZEOF(.got) ) { *(.realmode) }
_i386boot_realmode = LOADADDR(.realmode);
_i386boot_realmode_size = SIZEOF(.realmode);
/* 16bit BIOS emulation code (just enough to boot Linux) */
.bios 0 : AT ( LOADADDR(.realmode) + SIZEOF(.realmode) ) { *(.bios) }
_i386boot_bios = LOADADDR(.bios);
_i386boot_bios_size = SIZEOF(.bios);
. = .;
__u_boot_cmd_start = .;
.u_boot_cmd : { *(.u_boot_cmd) }
__u_boot_cmd_end = .;
/* The load addresses below assumes that the flash
* will be mapped so that 0x387f0000 == 0xffff0000
* at reset time
*
* The fe00 and ff00 offsets of the start32 and start16
* segments are arbitrary, the just have to be mapped
* at reset and the code have to fit.
* The fff0 offset of reset is important, however.
*/
. = 0xfffffe00;
.start32 : AT (0x3807fe00) { *(.start32); }
. = 0xf800;
.start16 : AT (0x3807f800) { *(.start16); }
. = 0xfff0;
.reset : AT (0x3807fff0) { *(.reset); }
_i386boot_end = (LOADADDR(.reset) + SIZEOF(.reset) );
}
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