[U-Boot] [Patch V3 3/3] armv8/ls1043aqds: add QSPI boot support

[Qianyu Gong]

> -----Original Message-----
> From: Scott Wood [mailto:oss at buserror.net]
> Sent: Thursday, January 14, 2016 8:21 AM
> To: Qianyu Gong <qianyu.gong at nxp.com>; u-boot at lists.denx.de
> Cc: B07421 at freescale.com; B48286 at freescale.com;
> Wenbin.Song at freescale.com; Mingkai Hu <mingkai.hu at nxp.com>
> Subject: Re: [U-Boot] [Patch V3 3/3] armv8/ls1043aqds: add QSPI boot support
> 
> On Tue, 2016-01-12 at 03:14 +0000, Qianyu Gong wrote:
> > > -----Original Message-----
> > > From: Scott Wood [mailto:oss at buserror.net]
> > > Sent: Tuesday, January 12, 2016 1:47 AM
> > > To: Qianyu Gong <qianyu.gong at nxp.com>; u-boot at lists.denx.de
> > > Cc: B07421 at freescale.com; B48286 at freescale.com;
> > > Wenbin.Song at freescale.com; Mingkai Hu <mingkai.hu at nxp.com>
> > > Subject: Re: [U-Boot] [Patch V3 3/3] armv8/ls1043aqds: add QSPI boot
> > > support
> > >
> > > On Mon, 2016-01-11 at 10:17 +0800, Gong Qianyu wrote:
> > > > diff --git a/board/freescale/ls1043aqds/ls1043aqds.c
> > > > b/board/freescale/ls1043aqds/ls1043aqds.c
> > > > index d6696ca..770b79f 100644
> > > > --- a/board/freescale/ls1043aqds/ls1043aqds.c
> > > > +++ b/board/freescale/ls1043aqds/ls1043aqds.c
> > > > @@ -43,15 +43,19 @@ enum {
> > > >
> > > >  int checkboard(void)
> > > >  {
> > > > +#ifndef CONFIG_QSPI_BOOT
> > > >  	char buf[64];
> > > >  #ifndef CONFIG_SD_BOOT
> > > >  	u8 sw;
> > > >  #endif
> > > > +#endif
> > > >
> > > >  	puts("Board: LS1043AQDS, boot from ");
> > > >
> > > >  #ifdef CONFIG_SD_BOOT
> > > >  	puts("SD\n");
> > > > +#elif defined(CONFIG_QSPI_BOOT)
> > > > +	puts("QSPI\n");
> > > >  #else
> > > >  	sw = QIXIS_READ(brdcfg[0]);
> > > >  	sw = (sw & QIXIS_LBMAP_MASK) >> QIXIS_LBMAP_SHIFT; @@ -68,12
> > > +72,15
> > > > @@ int checkboard(void)
> > > >  		printf("invalid setting of SW%u\n", QIXIS_LBMAP_SWITCH);
> > > #endif
> > > >
> > > > +#ifndef CONFIG_QSPI_BOOT
> > > > +	/* For QSPI boot, here I2C is not ready yet. */
> > > >  	printf("Sys ID: 0x%02x, Sys Ver: 0x%02x\n",
> > > >  	       QIXIS_READ(id), QIXIS_READ(arch));
> > > >
> > > >  	printf("FPGA:  v%d (%s), build %d\n",
> > > >  	       (int)QIXIS_READ(scver), qixis_read_tag(buf),
> > > >  	       (int)qixis_read_minor());
> > > > +#endif
> > >
> > > Why isn't i2c ready?  How is DDR inited without it?
> > >
> > > -Scott
> >
> > Hi Scott,
> >
> > The calling sequence in U-Boot is :
> > checkboard() -> init_func_i2c() -> dram_init()
> >
> > So I2C is not ready in checkboard() but is ready for DDR initialization.
> 
> Can you move the prints later in the boot sequence?
> 
> In any case, the relevant variable is whether qixis uses i2c, not whether you're
> booting from qspi (even if they are correlated).
> 
> -Scott

Yes. Only with QSPI it needs I2C to access QIXIS. 
But if defining CONFIG_DISPLAY_BOARDINFO_LATE, the print layout will look
really uncomfortable.. So we just comment out the FPGA prints for QSPI boot.

Regards,
Qianyu