Hi Geert,
On 30/06/22 03:55, Geert Uytterhoeven wrote:
Hi Michael,
On Wed, Jun 29, 2022 at 9:27 AM Michael Schmitz <schmitzmic@xxxxxxxxx> wrote:
Most users will opt for loading the kernel to a RAM chunk at a higher
physical address, making the lower chunk unusable (except as chip RAM),
meaning allocating a bounce buffer within the first 16 MB will most
likely fail anyway AIUI (but Geert would know that for sure).
Exactly. On Zorro III-capable machines, Zorro II RAM is not mapped
for general use, but can be used by the z2ram block device.
Is there any DMA capable memory other than chip and ZorroII RAM on these
machines?
Note that you can use it as a bounce buffer, by looking for and marking
free chunks in the zorro_unused_z2ram bitmap.
That would be similar to what amiga_chip_alloc() does, right? Any
advantages over using chip RAM (faster, perhaps)?
Cheers,
Michael
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
