PCIe Access - achieve bursts without DMA

Hello PPC-developers,
I'm currently trying to benchmark access speeds to our PCIe-connected IP-co=
res
located inside our FPGA. On x86-based systems I was able to achieve bursts =
for
both read and write access. On PPC32, using an e500v2, I had no success at =
all=20
so far.=20
I tried using ioremap_wc(), like I did on x86, for writing, and it only res=
ults in my
writes just being single requests, one after another.
For reads, I noticed I could not ioremap_cache() on PPC, so I used simple i=
oremap()
here.=20
I used several ways to read from the device, from simple readl(),memcpy_fro=
m_io(),=20
memcpy()  to cacheable_memcpy() - with no improvements.  Even when just iss=
uing
a batch of prefetch()-calls for all the memory to read did not result in re=
ad bursts.

I only get really poor results, writing is possible with around 40 MiByte/s=
, whereas I =20
can read at about only 3 MiByte/s.
After hours of studying the reference manual from freescale, looking into o=
ther code
and searching the web, I'm close to resignation.

Maybe someone of you has some more directions for me, I'd appreciate every =
hint
that leads me to my problem's solution - maybe I just missed something or l=
ack=20
knowledge about this architecture in general.

Thanks for your reading.


Michael