Re: [Qemu-devel] [PATCH] PL011: Fix ID reporting

[Peter Maydell]

On 7 January 2012 20:56, Marek Vasut <address@hidden> wrote:
>> On 7 January 2012 20:11, Marek Vasut <address@hidden> wrote:
>> > The AMBA IDs are supposed to be at the end of 0x2000 block, which the
>> > PL011 UART allocates. Current QEMU implementation puts those IDs at
>> > 0x1000 offset, which is wrong. The QEMU implementation also allocates
>> > only 0x1000 instead of 0x2000 of space.
>>
>> Why do you think this change is correct? The PL011 TRM
>> http://infocenter.arm.com/help/topic/com.arm.doc.ddi0183g/I18381.html
>> says the ID registers are at 0xFE0..0xFFC.
>> and for instance on the PBX-A9 devboard:
>> http://infocenter.arm.com/help/topic/com.arm.doc.dui0440b/Bbajihec.html
>> the UARTs are at 0x10009000, 0x1000A000, 0x1000B000, 0x1000C000, so
>> they clearly can't be 0x2000 in size.
>
> Then we have a problem, because eg. on freescale mx28 they are 0x2000 big. The
> only conclusion I can draw from this is that the size of the segment that can 
> be
> assigned to PL011 is variable and the ID-octet is always at the end.

Can you point me to some documentation? I looked at
http://cache.freescale.com/files/dsp/doc/ref_manual/MCIMX28RM.pdf?fsrch=1&sr=7
(i.MX28 Applications Processor Reference Manual) and although it has
a number of UARTs none of them looked obviously like PL011s.

-- PMM