[U-Boot] [PATCH] mmc: seperate block number into small parts for multi-write cmd

[Lei Wen]

Hi Wolfgang,

On Sun, Oct 10, 2010 at 2:48 PM, Wolfgang Denk <wd at denx.de> wrote:
> Dear Lei Wen,
>
> In message <AANLkTi=qBk7N+SdW_6K1=ywKM1ZKo5F-518Q7qceNXws at mail.gmail.com> you wrote:
>>
>> Although the common code is named as mmc.c, I think a lot of people use it
>> to work for sd too, since they are compatible in most case.
>
> Right. And where SD drivers differ, such differeng code should be
> provided by the SD drivers, and not pulled into the common code parts.
>
>> the driver cannot do nothing unless a mess change.
>
> Please explain why that shouldnot be possible. It's the driver that
> accesses your hardware, so it has full control over everything going
> on.
>
You are right, certainly driver cuold make this, but this would bring
a lot of complexity for it...
As I mentioned in the last mail, the multi-write command semantic
consist by multi-write command + stop transmission command.

Send what kind of command is the job of platform, and how to send the
command is the job of driver.
If I implement this seperation in the driver level, the driver must
send another stop transmission command during each internal
seperation,
which is so ugly and error prone..

So this is why I intend to put the code in the platform level...

Best regards,
Lei