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Re: [avr-gcc-list] Align Data and RAM Gaps

From: Thomas D. Dean
Subject: Re: [avr-gcc-list] Align Data and RAM Gaps
Date: Sat, 09 Aug 2014 04:18:42 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 08/09/14 01:18, Erik Christiansen wrote:

Thanks for the reply.  Interesting.

I think the solution I will use is to put the buffer between __bss_end and the stack.

Initializing in C:

extern unsigned int __bss_end;
buffer_base = (uint8_t *)(__bss_end & 0xff80) + 0x80
buf_head_ptr = spi_buffer_base
buf_tail_ptr = spi_buffer_base


I have a gap, but, it is on the order of 20 bytes.

The order of allocation of variables by ld is curious. The ldscripts give order to the sections. Moving variable declarations around seems to have little or no effect on the order I see from avr-nm.

Tom Dean

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