[U-Boot] [PATCH] ls1088a: qspi: Enable XIP mode above 16 MB addresses

[Rajat Srivastava]

> -----Original Message-----
> From: York Sun
> Sent: Monday, February 05, 2018 10:20 PM
> To: Rajat Srivastava <rajat.srivastava at nxp.com>; u-boot at lists.denx.de
> Subject: Re: [PATCH] ls1088a: qspi: Enable XIP mode above 16 MB addresses
> 
> On 02/04/2018 09:37 PM, Rajat Srivastava wrote:
> >
> >
> >> -----Original Message-----
> >> From: York Sun
> >> Sent: Friday, February 02, 2018 9:29 PM
> >> To: Rajat Srivastava <rajat.srivastava at nxp.com>; u-boot at lists.denx.de
> >> Subject: Re: [PATCH] ls1088a: qspi: Enable XIP mode above 16 MB
> >> addresses
> >>
> >> On 02/02/2018 04:07 AM, Rajat Srivastava wrote:
> >>> Currently in LS1088A, XIP mode in QSPI works up to 16 MB addresses.
> >>> This patch enables QSPI support in XIP mode for addresses above 16
> >>> MB as well.
> >>
> >> Can you write to QSPI above 16MB address?
> >
> > No, I think execute in place (XIP) itself means we can only read.
> > Please suggest if I shall change the patch description.
> >
> 
> How do you put the image into it to begin with? Don't tell me you were using an
> external tool or a hacked version of older U-Boot.
> 
This patch enables data read above 16MB using AHB (on Uboot prompt) and does 
not involve our QSPI driver. It is equivalent to reading from DDR via cp or md commands.
Whereas writing to flash is possible via IPS mode which involves our driver (using sf 
commands).