[U-Boot] [PATCH 02/11] IDE: Don't assume there are always two devices per bus
Wolfgang Denk
wd at denx.de
Mon Apr 25 23:31:21 CEST 2011
Dear rogan at dawes.za.net,
In message <1300435500-4909-3-git-send-email-rogan at dawes.za.net> you wrote:
> From: Rogan Dawes <rogan at dawes.za.net>
>
> Some SATA controllers can operate in an IDE compatible mode (e.g. mvsata)
> but will only ever have a single device per bus.
>
> This allows the upcoming DNS323 port to properly identify and use
> a drive on both SATA interfaces.
> ---
> include/ide.h | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/include/ide.h b/include/ide.h
> index 6a1b7ae..c812b28 100644
> --- a/include/ide.h
> +++ b/include/ide.h
> @@ -24,7 +24,8 @@
> #ifndef _IDE_H
> #define _IDE_H
>
> -#define IDE_BUS(dev) (dev >> 1)
> +#define IDE_BUS(dev) (dev >> ((CONFIG_SYS_IDE_MAXDEVICE / \
> + CONFIG_SYS_IDE_MAXBUS) - 1))
I am still not convinced this is a correct approach. Can we not have
mixed configurations, with 1 device on one controller (bus) and 2
devices on another controller (bus) ?
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Q: How many IBM CPU's does it take to execute a job?
A: Four; three to hold it down, and one to rip its head off.
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