[U-Boot] [PATCH 62/71] serial: spl: Implement empty functions for SPL

[Tom Rini]

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On 09/18/12 10:13, Marek Vasut wrote:
> Dear Tom Rini,
> 
>> On Mon, Sep 17, 2012 at 01:21:27AM +0200, Marek Vasut wrote:
>>> Implement empty serial_* functions for SPL without serial 
>>> support enabled. This is imperative to haave once serial multi 
>>> is enabled unconditionally.
>>> 
>>> Signed-off-by: Marek Vasut <marex at denx.de> Cc: Marek Vasut 
>>> <marek.vasut at gmail.com> Cc: Tom Rini <trini at ti.com> ---
>>> 
>>> common/serial.c |   12 ++++++++++++ 1 file changed, 12 
>>> insertions(+)
>>> 
>>> diff --git a/common/serial.c b/common/serial.c index 
>>> 631af65..cef4ba8 100644 --- a/common/serial.c +++ 
>>> b/common/serial.c @@ -27,6 +27,16 @@
>>> 
>>> #include <post.h> #include <linux/compiler.h>
>>> 
>>> +/* Implement prototypes for SPL without serial support */
>>> +#if defined(CONFIG_SPL_BUILD) && 
>>> !defined(CONFIG_SPL_SERIAL_SUPPORT) +int serial_init(void) { 
>>> return 0; } +void serial_setbrg(void) {} +int
>>> serial_getc(void) { return 0; } +int serial_tstc(void) { return
>>> 0; } +void serial_putc(const char c) {} +void serial_puts(const
>>> char *s) {}
>> 
>> This isn't quite right.  We need to allow for: - No output SPL, 
>> strings collected (so #defined to do{} while (0))
> 
> Which is not type-checked and will drag in bugs.

Scott has addressed this.

>> - puts + printf SPL (CONFIG_SPL_SERIAL_SUPPORT + 
>> CONFIG_SPL_LIBCOMMON_SUPPORT) - puts only SPL 
>> (CONFIG_SPL_SERIAL_SUPPORT + #define puts serial_puts/putc).
>> 
>> I'm not asking you to do that, but you will have to adapt to it 
>> once Jose is done with it.  What that means, off the top of my 
>> head, is we can just drop this patch as in the first and last 
>> case serial.o will be garbage-collected (or not built) and in
>> the middle case, this will be fully used.
> 
> I can't drop this patch as it will break all of SPL when 
> CONFIG_SERIAL_MULTI is unconditionally enabled.

Why is it breaking _all_ of SPL?  Have you run-tested this anywhere,
especially with SPL?  In most cases it should be used and real
functions provided or garbage collected away.

- -- 
Tom
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