On October 5, 2018 4:56:29 PM PDT, Alan Cox <alan@llwyncelyn.cymru> wrote:
>On Fri, 5 Oct 2018 13:00:05 -0700
>"H. Peter Anvin" <hpa@xxxxxxxxx> wrote:
>
>> On 10/5/18 6:34 AM, Johan Hovold wrote:
>> >>
>> >> Specifically, are there any platforms:
>> >>
>> >> 1. where simply stuffing values into c_ispeed or c_ospeed and
>setting BOTHER
>> >> can be used to set the baud rate, even for the "standard" baud
>rates
>> >> (obviously breaking if the kernel is too old -- how old is
>that?)
>> >
>> > This should work on all archs that define BOTHER and IBSHIFT (for
>input
>> > rates), and also to set standard rates (c_cflag would get updated
>to a
>> > Bfoo value).
>> >
>> > Alan added this (modulo some follow-up fixes) in edc6afc54968
>("[PATCH]
>> > tty: switch to ktermios and new framework").
>> >
>>
>> Would you happen to know if there are any architectures *other* than
>Alpha
>> which didn't support this by Linux 3.2 (the current glibc cutoff?)
>
>Alpha and Sparc were the only two oddities - because they used other
>people's existing APIs.
>
>Alan
I just did massive cleanup with an axe, and close to -2000 lines of code later, four architectures are oddballs: sparc, alpha, powerpc, and mips. Of those, alpha is the only one that still doesn't support BOTHER.
Also, both alpha and powerpc, especially the latter, can overrun the baud_table.
--
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