Re: kernel args from u-boot on M5282LITE

On Feb 11, 2008, at 7:03 PM, Greg Ungerer wrote:
> Its not the pointer I am worried about :-)
> It is what it points to. Where is the actual string of
> the command line in memory. Will it be overwritten?

u-boot chooses high memory.
It appears that this is moderately reasonable. What do you think?

Here's the code from u-boot:

-=-=-

         /*
          * Booting a (Linux) kernel image
          *
          * Allocate space for command line and board info - the
          * address should be as high as possible within the reach of
          * the kernel (see CFG_BOOTMAPSZ settings), but in unused
          * memory, which means far enough below the current stack
          * pointer.
          */
         asm("movel %%a7, %%d0\n"
             "movel %%d0, %0\n": "=d"(sp): :"%d0");

         debug("## Current stack ends at 0x%08lX ", sp);

         sp -= 2048;             /* just to be sure */
         if (sp > CFG_BOOTMAPSZ)
                 sp = CFG_BOOTMAPSZ;
         sp &= ~0xF;

         debug("=> set upper limit to 0x%08lX\n", sp);

         cmdline = (char *)((sp - CFG_BARGSIZE) & ~0xF);
         kbd = (bd_t *) (((ulong) cmdline - sizeof(bd_t)) & ~0xF);

         if ((s = getenv("bootargs")) == NULL)
                 s = "";

         strcpy(cmdline, s);
-=-=-

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