[U-Boot-Users] [PATCH] ARTOS boot support for u-boot

[Pantelis Antoniou]

Wolfgang Denk wrote:

>Dear Pantelis,
>
>in message <3E9E9B5C.30904 at intracom.gr> you wrote:
>  
>
>>The following patch against u-boot-0.3.0 adds support for booting ARTOS 
>>images
>>using u-boot. ARTOS is a custom in-house operating system in use by my 
>>company.
>>    
>>
>
>I will not add  the  patch  for  now,  as  it  contains  some  severe
>problems:
>  
>
Correct.

>  
>
>>+	/*
>>+	 * Booting an ARTOS kernel image + application
>>+	 */
>>+
>>+	/* place data at the top of memory */
>>+	top = gd->bd->bi_memstart + gd->bd->bi_memsize;
>>+
>>+	/* first check the artos specific boot args, then the linux args*/
>>+	if ((s = getenv("abootargs")) == NULL && (s = getenv("bootargs")) == NULL)
>>+		s = "";
>>+
>>+	/* get length of cmdline, and place it */
>>+	len = strlen(s);
>>+	top = (top - (len + 1)) & ~0xF;
>>+	cmdline = (char *)top;
>>+	debug ("## cmdline at 0x%08lX ", top);
>>+	strcpy(cmdline, s);
>>    
>>
>^^^^^^^^^^^^^^^^^^^^^^^^^^^
>  
>
>>+	/* copy bdinfo */
>>+	top = (top - sizeof(bd_t)) & ~0xF;
>>+	debug ("## bd at 0x%08lX ", top);
>>+	kbd = (bd_t *)top;
>>+	memcpy(kbd, gd->bd, sizeof(bd_t));
>>    
>>
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
>You cannot do that. U-Boot copies itself to the top of memory, so you
>are overwriting U-Boot's data here. It was pure luck  if  this  wrked
>for you. but the behaviour is completely undefined.
>
>Please implement this in a way that is compatible to U-Boot's memory
>map.
>
>Also, since this is a proprietary OS with a very limited  propagation
>I  would  like to ask to make the ARTOS boot code configurable, i. e.
>add a #define so it can enabled it in the board config file, but will
>not add to the code size for those systems that don't want it.
>
>Best regards,
>
>Wolfgang Denk
>
>  
>
Points addressed with this patch.

That it worked the first time was very lucky indeed.

Regards


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