[Arm-netbook] FEL protocol have been reversed

[Tom Cubie]

On Wed, Jun 13, 2012 at 3:40 PM, Henrik Nordström <
henrik at henriknordstrom.net> wrote:

> ons 2012-06-13 klockan 10:41 +0800 skrev Tom Cubie:
>
>
> > Awesome!
>
> Thanks!
>
> I honestly don't know why it took this long. As expected the protocol
> used by FEL is really simple. Only excuse it that I got held up by the
> u-boot SPL issues..
>
> Tom, would you be able to provide share hints on the memory map at this
> stage of the boot process? (BROM FEL only, not any details on what
> livesuite is doing)
>
> Questions:
>
> 1. how large is the SRAM area at 0x00000000? 48KB?
>
> 32K.

> 2. Which parts of the SRAM is reserved for internal BROM FEL usage and
> should not be touched? Or put otherwise, which parts of the SRAM area is
> free for uploading code to execute?
>
> The whole 32k is used by FEL, FEL is kind of an OS, and program sent from
pc are apps.

> 3. In uboot sources it's mentioned that the SRAM is divided in 4
> regions. Do these regions have different purposes?
>
>        #define SUNXI_SRAM_A1_BASE 0X00000000 /* 16k */
>        #define SUNXI_SRAM_A2_BASE 0X00004000 /* 16k */
>        #define SUNXI_SRAM_A3_BASE 0X00008000 /* 13k */
>        #define SUNXI_SRAM_A4_BASE 0X0000B400 /* 3k */
>
> Yes, afaik, some region is reserved for special usage, like nand driver.

>  Regards
> Henrik
>
>
>
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-- 
Keep simple, stay foolish.
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