* [ECOS] Help lcs_support.c IPAQ
@ 2003-10-23 13:00 Oscar
2003-10-23 13:03 ` Gary Thomas
0 siblings, 1 reply; 2+ messages in thread
From: Oscar @ 2003-10-23 13:00 UTC (permalink / raw)
To: ecos-discuss
Hi,
could somebody explain me because is necessary this code line in lcd_init()
func.:
fp = (struct lcd_frame
*)hal_virt_to_phys_address((cyg_uint32)lcd_frame_buffer);
because the conversion in necessary, i can't work only with virtual address?
THANKS
OSCAR
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [ECOS] Help lcs_support.c IPAQ
2003-10-23 13:00 [ECOS] Help lcs_support.c IPAQ Oscar
@ 2003-10-23 13:03 ` Gary Thomas
0 siblings, 0 replies; 2+ messages in thread
From: Gary Thomas @ 2003-10-23 13:03 UTC (permalink / raw)
To: Oscar; +Cc: ecos-discuss
On Thu, 2003-10-23 at 07:00, Oscar wrote:
> Hi,
> could somebody explain me because is necessary this code line in lcd_init()
> func.:
>
> fp = (struct lcd_frame
> *)hal_virt_to_phys_address((cyg_uint32)lcd_frame_buffer);
>
> because the conversion in necessary, i can't work only with virtual address?
>
The hardware needs to know the physical address of the frame buffer.
Your code can/must use the virtual address.
--
Gary Thomas <gary@mlbassoc.com>
MLB Associates
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Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss
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2003-10-23 13:00 [ECOS] Help lcs_support.c IPAQ Oscar
2003-10-23 13:03 ` Gary Thomas
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