From: Baruch Siach <baruch@tkos.co.il>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 8/8] mx25 3ds: add support for boot from UART
Date: Thu, 10 Jun 2010 14:49:39 +0300 [thread overview]
Message-ID: <20100610114939.GF31840@jasper.tkos.co.il> (raw)
In-Reply-To: <20100610111237.GH20799@pengutronix.de>
Hi Sascha,
On Thu, Jun 10, 2010 at 01:12:37PM +0200, Sascha Hauer wrote:
> On Wed, Jun 09, 2010 at 10:05:07AM +0300, Baruch Siach wrote:
[snip]
> > --- a/board/freescale-mx25-3-stack/3stack.c
> > +++ b/board/freescale-mx25-3-stack/3stack.c
> > @@ -44,7 +44,11 @@ extern unsigned long _stext;
> >
> > void __naked __flash_header_start go(void)
> > {
> > +#if defined CONFIG_FREESCALE_MX25_3STACK_UART_BOOT
> > + __asm__ (".word exception_vectors\n");
> > +#else
> > __asm__ __volatile__("b exception_vectors\n");
> > +#endif
>
> Do we need this change? I booted other i.MX SoCs without it. I really
> like to keep this because it enables to jump to the first address if
> booting second stage.
This is actually a (very) short "flash" header with only the
app_code_jump_vector entry left. Only reverse engineering the Freescale ATK
software revealed this secret. Reading through the i.MX25 Reference Manual I
now see that there is an option to pass DCD separately, but it complicates the
boot sequence. This change only affects builds when this configuration
option, and this option is disabled by default.
baruch
--
~. .~ Tk Open Systems
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- baruch@tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
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next prev parent reply other threads:[~2010-06-10 11:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-09 7:04 [PATCH 0/8] i.MX25 3DS fixes and enhancements Baruch Siach
2010-06-09 7:05 ` [PATCH 1/8] mx25 3ds: fix build failure Baruch Siach
2010-06-09 7:05 ` [PATCH 2/8] mx25: fix typo in imx25-regs.h Baruch Siach
2010-06-09 7:05 ` [PATCH 3/8] mx25 3ds: cleanup lowlevel_init code Baruch Siach
2010-06-09 7:05 ` [PATCH 4/8] mx25: add support for i2c Baruch Siach
2010-06-09 7:05 ` [PATCH 5/8] i2c: add driver for the MC34704 PMIC Baruch Siach
2010-06-09 7:05 ` [PATCH 6/8] mx25 3ds: add support for i2c master and PMIC Baruch Siach
2010-06-14 13:01 ` Ivo Clarysse
2010-06-14 13:39 ` Baruch Siach
2010-06-09 7:05 ` [PATCH 7/8] mx25 3ds: fix fec initialization Baruch Siach
2010-06-09 7:05 ` [PATCH 8/8] mx25 3ds: add support for boot from UART Baruch Siach
2010-06-10 11:12 ` Sascha Hauer
2010-06-10 11:49 ` Baruch Siach [this message]
2010-06-10 12:12 ` Sascha Hauer
2010-06-10 12:42 ` Baruch Siach
2010-06-10 12:46 ` Baruch Siach
2010-06-10 13:56 ` Sascha Hauer
2010-06-10 16:09 ` Baruch Siach
2010-06-10 11:10 ` [PATCH 0/8] i.MX25 3DS fixes and enhancements Sascha Hauer
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