<br><br><div class="gmail_quote">On Wed, Jun 13, 2012 at 3:40 PM, Henrik Nordström <span dir="ltr"><<a href="mailto:henrik@henriknordstrom.net" target="_blank">henrik@henriknordstrom.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
ons 2012-06-13 klockan 10:41 +0800 skrev Tom Cubie:<br>
<br>
<br>
> Awesome!<br>
<br>
Thanks!<br>
<br>
I honestly don't know why it took this long. As expected the protocol<br>
used by FEL is really simple. Only excuse it that I got held up by the<br>
u-boot SPL issues..<br>
<br>
Tom, would you be able to provide share hints on the memory map at this<br>
stage of the boot process? (BROM FEL only, not any details on what<br>
livesuite is doing)<br>
<br>
Questions:<br>
<br>
1. how large is the SRAM area at 0x00000000? 48KB?<br>
<br></blockquote><div>32K.</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
2. Which parts of the SRAM is reserved for internal BROM FEL usage and<br>
should not be touched? Or put otherwise, which parts of the SRAM area is<br>
free for uploading code to execute?<br>
<br></blockquote><div>The whole 32k is used by FEL, FEL is kind of an OS, and program sent from</div><div>pc are apps. </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
3. In uboot sources it's mentioned that the SRAM is divided in 4<br>
regions. Do these regions have different purposes?<br>
<br>
#define SUNXI_SRAM_A1_BASE 0X00000000 /* 16k */<br>
#define SUNXI_SRAM_A2_BASE 0X00004000 /* 16k */<br>
#define SUNXI_SRAM_A3_BASE 0X00008000 /* 13k */<br>
#define SUNXI_SRAM_A4_BASE 0X0000B400 /* 3k */<br>
<div class="HOEnZb"><div class="h5"><br></div></div></blockquote><div>Yes, afaik, some region is reserved for special usage, like nand driver. </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">
Regards<br>
Henrik<br>
<br>
<br>
<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><font face="'trebuchet ms', sans-serif">Keep simple, stay foolish.</font>
<div> </div><br>