On Mon, Jan 25, 2016 at 09:45:47PM -0500, Tom Rini wrote: >On Tue, Jan 26, 2016 at 09:55:43AM +0800, Peng Fan wrote: >> Hi Simon, >> >> On Mon, Jan 25, 2016 at 06:11:24PM -0700, Simon Glass wrote: >> >+Hans >> > >> >Hi Tom, >> > >> >On 21 January 2016 at 05:24, Tom Rini <tr...@konsulko.com> wrote: >> >> On Wed, Jan 20, 2016 at 07:46:15PM -0700, Simon Glass wrote: >> >>> +Mugunthan, Tom >> >>> >> >>> On 17 January 2016 at 03:56, Christophe Ricard >> >>> <christophe.ric...@gmail.com> wrote: >> >>> > Convert omap3_spi driver to DM and keep compatibility with previous >> >>> > mode. >> >>> > >> >>> > Signed-off-by: Christophe Ricard <christophe-h.ric...@st.com> >> >>> > --- >> >>> > >> >>> > drivers/spi/Kconfig | 6 + >> >>> > drivers/spi/omap3_spi.c | 439 >> >>> > ++++++++++++++++++++++++++++++++++++++++++------ >> >>> > drivers/spi/omap3_spi.h | 14 +- >> >>> > 3 files changed, 402 insertions(+), 57 deletions(-) >> >>> >> >>> This is a pretty painful conversion, with lots of #ifdefs. I think it >> >>> would be possible to use a common pointer type and reduce this. >> >>> >> >>> But perhaps it does not matter - how long must we be in the state of >> >>> supporting legacy SPI? Can we convert all TI boards to driver model? >> >> >> >> We _really_ need some way to support more than one board per binary >> >> before we can move everything to DM only. >> >> >> >> I think we can kind of do this today if we stick to using platform data >> >> for everything that's board-specific rather than SoC-defined. What we >> >> talked about at ELCE was auto-generating the pdata from the device tree, >> >> I think. >> > >> >We discussed this on IRC but since that doesn't exist as far as the >> >mailing list is concerned... >> > >> >The current plan is: >> > >> >- Adjust build system to optionally build a u-boot.img in FIT format >> >that includes the U-Boot binary and >1 device tree files >> >- Adjust SPL to load this >> >- Add a way for SPL to determine which device tree to select (by >> >calling a board-specific function) >> >- Have SPL pass this selected device tree to U-Boot when it starts >> >> Can dtb be sperated from the final u-boot.img, if using SPL? >> I mean let SPL load the u-boot.img and the dtb to correct DRAM address. >> And the dtb is shared with linux kernel. > >This sounds similar, but different. The problem I'm asking to be solved >is that at the starting point, there are no DTBs on the hardware. But
Oh. Thanks for explanation. >we can in software easily and reliable tell which of say 3 boards we are >on. At that point, we need to make sure that both SPL and then U-Boot >know which board they are on. And if in U-Boot we use the DT to pass in >all data, it has to be correct. It sounds to me like you're describing >the case where the HW has the dtb stored at a known location and you >just don't need it embedded within SPL/U-Boot. Yeah. I mean not embedded dtb into SPL/U-Boot, just let it be sperate file. Thanks, Peng. > >-- >Tom _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
