Dear Bin, > -----Original Message----- > From: Bin Meng [mailto:bmeng...@gmail.com] > Sent: Friday, June 29, 2018 9:09 AM > To: Prabhakar Kushwaha <prabhakar.kushw...@nxp.com> > Cc: York Sun <york....@nxp.com>; Simon Glass <s...@chromium.org>; u- > b...@lists.denx.de > Subject: Re: [U-Boot] Support of device-tree for PowerPC platform: Query > > Hi Prabhakar, > > On Fri, Jun 29, 2018 at 10:55 AM, Prabhakar Kushwaha > <prabhakar.kushw...@nxp.com> wrote: > > > >> -----Original Message----- > >> From: York Sun > >> Sent: Thursday, June 28, 2018 9:07 PM > >> To: Prabhakar Kushwaha <prabhakar.kushw...@nxp.com>; Simon Glass > >> <s...@chromium.org> > >> Cc: u-boot@lists.denx.de; Poonam Aggrwal > <poonam.aggr...@nxp.com>; > >> Jagdish Gediya <jagdish.ged...@nxp.com> > >> Subject: Re: Support of device-tree for PowerPC platform: Query > >> > >> On 06/27/2018 11:30 PM, Prabhakar Kushwaha wrote: > >> > >> <snip> > >> > >> >> Thanks for the direction. > >> >> > >> >> We will be following approach "a" with updated flash map. > >> >> We will allocate 1MB for uboot in flash. Out which 64K for DTB and > >> >> 960KB for u-boot for future increase. > >> >> > >> >> We will also update location of env and fman ucode for NXP platforms. > >> >> > >> > > >> > > >> > Other thought, > >> > use CONFIG_OF_SEPARATE but **don't** concatenate dtb with u- > boot. > >> In > >> > this case user has to program u-boot and dtb separately at > >> > different location. It will also have minimal impact on PowerPC > >> > platforms > >> > > >> > Just wondering if this approach has any disadvantages in longer run. > >> > What if user forget to program dtb and restart system?? > >> > > >> > >> If we cannot combine DT with U-Boot image, we may have to live with > >> two separated images. We may have to shift the ENV sectors to make DT > >> right above U-Boot for convenience. If U-Boot can boot up and show a > >> message of missing DT, it is acceptable to me. > >> > > > > Putting DT in place of Env require lots of modification. > > I want to use existing QorIQ platform's memory map. > > > > Here 1 MB flash memory is reserved for Linux DTB. Just wanted to split into > 2 parts (Linux, uboot) with both size 512KB. > > This 1 MB location is far from u-boot, env, fman ucode. > > > > Since the QorIQ parts have lots of firmware that need to be put in flash, > binman is the best choice here and can handle dtb as well. >
Sure binman can help in creating/combining firmware for flash. But we still require flash map change to accommodate dtb. This is the reason I want to use reserved area which is very far from u-boot, env etc. I was thinking about any possible issue if u-boot and dtb are not together. --pk _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
