Re: [Qemu-devel] [PATCH 07/10] mips_malta: Clean up definition of flash memory size somewhat

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 2/19/19 2:43 PM, Markus Armbruster wrote:
> Philippe Mathieu-Daudé <philmd@redhat.com> writes:
> 
>> On 2/18/19 1:56 PM, Markus Armbruster wrote:
>>> pflash_cfi01_register() takes a size in bytes, a block size in bytes
>>> and a number of blocks.  mips_malta_init() passes BIOS_SIZE, 65536,
>>> FLASH_SIZE >> 16.  Actually consistent only because BIOS_SIZE (defined
>>> in include/hw/mips/bios.h as (4 * MiB)) matches FLASH_SIZE (defined
>>> locally as 0x400000).  Confusing all the same.
>>>
>>> Pass FLASH_SIZE instead of BIOS_SIZE.
>>
>> Your cleanup is correct.
>>
>>>
>>> There are more uses of BIOS_SIZE, but I don't sufficiently understand
>>> them to attempt cleanup.
>>
>> BIOS_SIZE is a MIPS architecture definition, incorrectly used around.
>> This simply means "Top of 32bit address space - Boot Vector address".
>> There is nothing wrong in plugging bigger/smaller flashes around the
>> boot vector.
>> (I have a series cleaning this definition, but I'm throttling my MIPS
>> apports).
>>
>>>
>>> Cc: Aurelien Jarno <aurelien@aurel32.net>
>>> Cc: Aleksandar Rikalo <arikalo@wavecomp.com>
>>> Signed-off-by: Markus Armbruster <armbru@redhat.com>
>>> ---
>>>  hw/mips/mips_malta.c | 4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
>>> index fff5ed19bd..65cdda4881 100644
>>> --- a/hw/mips/mips_malta.c
>>> +++ b/hw/mips/mips_malta.c
>>> @@ -1269,12 +1269,12 @@ void mips_malta_init(MachineState *machine)
>>>      if (dinfo) {
>>>          printf("Register parallel flash %d size " TARGET_FMT_lx " at "
>>>                 "addr %08llx '%s' %x\n",
>>> -               fl_idx, bios_size, FLASH_ADDRESS,
>>> +               fl_idx, FLASH_SIZE, FLASH_ADDRESS,
>>>                 blk_name(dinfo->bdrv), fl_sectors);
>>>      }
>>>  #endif
>>>      fl = pflash_cfi01_register(FLASH_ADDRESS, NULL, "mips_malta.bios",
>>> -                               BIOS_SIZE,
>>> +                               FLASH_SIZE,
>>>                                 dinfo ? blk_by_legacy_dinfo(dinfo) : NULL,
>>>                                 65536, fl_sectors,
>>>                                 4, 0x0000, 0x0000, 0x0000, 0x0000, be);
>>>
>>
>> Does that mean you can remove the "hw/mips/bios.h" include now?
> 
> No, since there are more uses of BIOS_SIZE in this file.  They feel
> inappropriate to me, but I don't feel confident enough to attempt
> cleanup.

OK, since I already did it twice, I'll do it once your work get merged.

> 
>> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> 
> Thanks!
>