On 06/26/2014 06:27 AM, Alexander Aring wrote:
> On Sun, Jun 22, 2014 at 11:50:56PM +0200, Sebastian Hesselbarth wrote:
>> On 06/22/2014 10:34 PM, Alexander Aring wrote:
>>> This patch add a basic support for the D-Link DNS-325.
>>>
>>> Currently only booting via uart with kwboot is supported. The barebox
>>> kwboot utility doesn't work at the moment. Use kwboot utility from u-boot
>>> instead.
>>
>> Why does kwboot does not work? There is an issue with early Kirkwood's
>> BootROM and UART boot mode. Just try over and over again. I also recall
>> modifying the timeouts may help.
>>
>
> I tried to change the timeouts and it works now. I take these timings from
> u-boot. Is there any reason why these timings differs?
IIRC, timings differ because barebox kwboot was mainly tested on Armada
370 and that low timings break UART boot mode there. I remember some
discussion about it a while ago. I'll see if I can find the discussion
and if there are any hints for timeouts that suite both Kirkwood and
Armada 370/XP.
> Datasheet says nothing about any delay while loop for sending bootmsg.
>
>
> Here is my diff with the very small change:
>
> diff --git a/scripts/kwboot.c b/scripts/kwboot.c
> index e068660..bcb5972 100644
> --- a/scripts/kwboot.c
> +++ b/scripts/kwboot.c
> @@ -34,8 +34,8 @@ static unsigned char kwboot_msg_debug[] = {
> 0xDD, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77
> };
>
> -#define KWBOOT_MSG_REQ_DELAY 1000 /* ms */
> -#define KWBOOT_MSG_RSP_TIMEO 1000 /* ms */
> +#define KWBOOT_MSG_REQ_DELAY 10 /* ms */
> +#define KWBOOT_MSG_RSP_TIMEO 50 /* ms */
>
> /*
> * Xmodem Transfers
>
>
>
> btw.:
>
> Now I see that the internal ROM bootloader could also boot from SATA
> device - this sounds interesting. I will try that next weekend.
Boot source is determined by bootstrap pins, i.e. some pull-up/pull-down
resistors on board. UART boot mode check was added to BootROM in some
later Kirkwoods and _additionally_ checks for UART boot source.
You cannot just change the default boot source without soldering.
Sebastian
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