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Re: [Qemu-block] [Qemu-devel] [PATCH 07/10] mips_malta: Clean up definit


From: Philippe Mathieu-Daudé
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 07/10] mips_malta: Clean up definition of flash memory size somewhat
Date: Tue, 19 Feb 2019 14:02:09 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0

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 <address@hidden>
> Cc: Aleksandar Rikalo <address@hidden>
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
>  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?

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>



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