URL:
<http://savannah.nongnu.org/bugs/?21805>
Summary: boot.h: Use out instead of sts
Project: AVR C Runtime Library
Submitted by: sjackman
Submitted on: Friday 12/14/2007 at 23:51
Category: None
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Header files
Status: None
Percent Complete: 0%
Assigned to: None
Originator Email: [EMAIL PROTECTED]
Open/Closed: Open
Discussion Lock: Any
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Details:
>From boot.h:
\todo From email with Marek: On smaller devices (all except
ATmega64/128),
__SPM_REG is in the I/O space, accessible with the shorter "in" and
"out"
instructions - since the boot loader has a limited size, this could be
an
important optimization.
I'm writing a boot-loader that has to fit into the 256 byte boot-loader space
of the 8 kB parts. Here is my proposed solution to fix this matter. I've only
fixed the __boot_xxx_normal variants, but the same logic could easily be
extended to the __boot_xxx_alternate and __boot_xxx_extended variants.
Cheers,
Shaun
2007-12-14 Shaun Jackman <[EMAIL PROTECTED]>
* include/avr/boot.h (__boot_page_fill_normal,
__boot_page_erase_normal, __boot_page_write_normal,
__boot_rww_enable): Use an out instruction rather than an sts
instruction when possible.
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File Attachments:
-------------------------------------------------------
Date: Friday 12/14/2007 at 23:51 Name: boot.diff Size: 5kB By: sjackman
<http://savannah.nongnu.org/bugs/download.php?file_id=14628>
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