[U-Boot] Bug in TOP860 code with gcc 4.8.1

[Jeroen Hofstee]

Hello Reinhard,

On 01/14/2014 12:33 PM, Reinhard Meyer wrote:
> Dear Wolfgang,
>> Dear Reinhard,
>>
>> attempting to build the TOP860 code with a GCC 4.8.1 based tool chain
>> (say ELDK v5.5 or Yocto 1.5) gives the following errors:
>>
>> -> ./MAKEALL TOP860
>> Configuring for TOP860 board...
>>     text    data     bss     dec     hex filename
>>   165471   21020   17316  203807   31c1f ./u-boot
>> ../common/flash.c: In function 'flash_init':
>> ../common/flash.c:336:20: warning: iteration 128u invokes undefined 
>> behavior [-Waggressive-loop-optimizations]
>>       info->start[i] = (ulong)addr + 0x10000 * i;
>>                      ^
>> ../common/flash.c:334:4: note: containing loop
>>      for (i = 0; i < info->sector_count; i++)
>>      ^
>> ...
>>
>> Can you please provide a fix - or is this old hardware and the code
>> should be removed from the U-Boot tree?
> 1. on first and second glance I cannot see where this (simple!!) loop 
> might "invoke undefined behaviour". Seems like a compiler/optimizer 
> bug to me...
>
> 2. should not the same issue arise with TOP5200 (using the same 
> flash.c) ??
>
> 3. nevertheless TOP860 can be removed.

It is out of bounds:

include/configs/TOP860.h:#define CONFIG_SYS_MAX_FLASH_SECT    128 /* max 
number of sectors on one chip    */
include/configs/TOP5200.h:#define CONFIG_SYS_MAX_FLASH_SECT 256    /* 
max num of sects on one chip */

Removing will work as well of course ;)

Regards,
Jeroen