# Re: \[RFC 3/6\] drm: add SimpleDRM driver

- From: Andy Lutomirski \<luto@amacapital.net\>
- Date: 2013-06-25 01:05:16 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2013/06/4072265
- Thread: https://ratatoskr.run/dri-devel/2013/06/4072197/t.md

```text
On 06/24/2013 03:27 PM, David Herrmann wrote:
> +	sdrm->fb_map = ioremap(sdrm->fb_base, sdrm->fb_size);

This should probably be ioremap_wc.  Otherwise it will be *really* slow
if used in legacy mode and it may cause conflicts with the
pgprot_writecombine mode for mmap.

(Watching boot messages go by on fbcon on efifb was like using an old
2400 baud modem before I made the corresponding change to efifb.)

--Andy
```