Hi Adam, > Subject: Re: Applying DTB Overlays from ATF on RZ/G2 > > On Mon, Jan 9, 2023 at 2:46 AM Biju Das <biju.das...@bp.renesas.com> wrote: > > > > Hi Adam, > > > > > Subject: Re: Applying DTB Overlays from ATF on RZ/G2 > > > > > > On Sat, Jan 7, 2023 at 6:01 AM Adam Ford <aford...@gmail.com> wrote: > > > > > > > > On Wed, Jan 4, 2023 at 5:55 PM Marek Vasut <ma...@denx.de> wrote: > > > > > > > > > > On 1/5/23 00:48, Heinrich Schuchardt wrote: > > > > > > Am 5. Januar 2023 00:19:36 MEZ schrieb Adam Ford > <aford...@gmail.com>: > > > > > >> On Wed, Jan 4, 2023 at 5:15 PM Heinrich Schuchardt > > > <xypron.g...@gmx.de> wrote: > > > > > >>> > > > > > >>> On 1/4/23 22:35, Adam Ford wrote: > > > > > >>>> ATF generates a couple memory nodes based on how it's > > > > > >>>> compiled and generates a reserved-memory node, and I want > > > > > >>>> to overlay it with the device tree so Linux knows about this > reserved memory. > > > > > >>>> > > > > > >>>> When I boot U-Boot, I can read the reserved-memory node: > > > > > >>>> > > > > > >>>> => fdt addr 0xe631e588 > > > > > >>>> Working FDT set to e631e588 => fdt print /reserved-memory > > > > > >>>> reserved-memory { > > > > > >>>> lossy-decompression@54000000 { renesas,formats = > > > > > >>>> <0x00000000>; no-map; reg = <0x00000000 > > > > > >>>> 0x54000000 0x00000000 0x03000000>; compatible = > > > > > >>>> "renesas,lossy-decompression", "shared-dma-pool"; }; }; => > > > > > >>>> > > > > > > + CC Biju Das > > > > > > > >>>> I attempt to overlay it with the following: > > > > > >>>> > > > > > >>>> => run loadfdt > > > > > >>>> 65932 bytes read in 6 ms (10.5 MiB/s) => fdt addr > > > > > >>>> $load_addr > > > > > >>> > > > > > >>> When actually setting the address you will see a message > > > > > >>> "Working FDT set to %lx\n". So I assume $load_addr is empty. > > > > > >>> > > > > > >>> Did you mean $loadaddr or $fileaddr? > > > > > >> > > > > > >> Opps, that was a copy-paste error. Even with that, I still > > > > > >> get the failure to overlay: > > > > > >> > > > > > > > > > > > > Did you load a .dtbo file to apply? You cannot apply a devicetree. > > > > > > > > > > > > Is the fdt that you want to apply the overlay to built with > > > > > > symbols > > > (dtc parameter -@)? > > > > > > > > > > Note that the fragment passed to U-Boot by upstream ATF is > > > > > already automatically merged into the U-Boot control DT (see > > > > > board/renesas/rcar-common/common.c ) . U-Boot should pass that > > > > > on to Linux automatically. > > > > > > > > I ran some tests, and it appears the function fdtdec_board_setup > > > > is never getting called. > > > > Without that board detection and proper memory detection in u-boot/kernel > won't happen. > > [1] > > https://jpn01.safelinks.protection.outlook.com/?url=https%3A%2F%2Felix > > ir.bootlin.com%2Fu-boot%2Flatest%2Fsource%2Fboard%2Fhoperun%2Fhihope-r > > zg2%2Fhihope-rzg2.c%23L83&data=05%7C01%7Cbiju.das.jz%40bp.renesas.com% > > 7C0852ecec21cd4a3c09a908daf260323d%7C53d82571da1947e49cb4625a166a4a2a% > > 7C0%7C0%7C638088792215848419%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM > > DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdat > > a=RWHfDYQgV7duNwRByGAoqv%2BekIxYMEfUzQLJFME9sQY%3D&reserved=0 > > > > Right now, my device trees have the memory node(s), but not the reserved- > memory node which I'm trying to insert dymanically based on how ATF is > built. > > > > > > > That looks like the code that grabs the blob from ATF. I > > > > intentionally removed the memory nodes from the kernel device tree > > > > expecting the memory nodes to get added from ATF, but when I > > > > booted it, it promptly hung. That implied to me that the memory > > > > nodes didn't get added from ATF. > > > > > > > > I added some debug code and noticed that ft_board_setup did not > > > > get executed, so I created a call to fdtdec_board_setup from > > > > ft_board_setup and my board booted just fine. I am curious to > > > > know if other rcar/rzg2 boards are seeing something similar? Is > > > > calling fdtdec_board_setup from ft_board_setup appropriate? > > > > It should be working as we are using lossy compression for media > > playback for VLP release and VLP release[1] is using Mainline ATF and U- > boot. Similar case for R-Car. > > I remember correctly for lossy compression case, we explicitly add a node > in kernel [2]. > > > > > > Your custom repo has the reserved-memory node in the device tree. I was > trying to figure out how to get the reserved-memory node to propagate from > ATF through U-Boot to Linux without needing to have the reserved-memory node > in the device tree. I had attempted to add the reserved-memory node > upstream, and Geert asked me to use ATF insead. > I added debug code into the function that reads the ATF node that is passed > to U-Boot and it doesn't appear to be getting called unless I modify the > code to explicitly do it. I wasn't sure if I am missing a Kconfig option > somewhere.
May be Marek can help here. May be U-boot[1] needs patching similar to Optee For lossy-compression. [1] https://elixir.bootlin.com/u-boot/latest/source/lib/optee/optee.c Cheers, Biju