On Thu, Jan 23, 2020 at 10:33 PM Tom Rini <trini@xxxxxxxxxxxx> wrote: > > On Thu, Jan 23, 2020 at 10:25:50PM +0530, Jagan Teki wrote: > > On Mon, Jan 20, 2020 at 11:10 PM Alexander Graf <agraf@xxxxxxxxx> wrote: > > > > > > > > > On 20.01.20 18:22, Tom Rini wrote: > > > > +A few people that may have insight to my question > > > > > > > > On Sat, Dec 21, 2019 at 01:24:31PM +0530, Jagan Teki wrote: > > > > > > > >> Add distro boot command support for SPI flash. > > > >> > > > >> This distro boot will read the boot script at specific > > > >> location at the flash and start sourcing the same. > > > >> > > > >> The common macro like BOOTENV_SHARED_FLASH would help > > > >> to extend the support for nand flash in future. > > > >> > > > >> Cc: Tom Rini <trini@xxxxxxxxxxxx> > > > >> Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> > > > > What distro is this for? My concern here is that hundreds of boards > > > > (literally) grow by a few hundred bytes to add in this bit of additional > > > > default logic. That's not a big problem if distributions are now going > > > > to be using SPI flash as where they're programming in their bootscript. > > > > But, who is doing that? Thanks! > > > > > > > > > I am not aware of any "distro" that puts a U-Boot script at offset 0 of > > > the SPI Flash. > > > > > > Traditionally, SPI Flash boot setups were always very hand crafted - > > > exactly the opposite of what distro boot is for. That said, I think > > > supporting SPI Flash boot for rk3399 is great! Albeit I would personally > > > only store U-Boot and the environment on SPI, not the target OS. > > > > > > Jagan, is putting a U-Boot script on the SPI Flash something you thought > > > of or something that the rk3399 reference board already does? If it's > > > the latter, maybe you could add it as a board custom boot function? > > > > Yes it would be later that points to. rk3399 has SPI flash layout and > > out of which one of offset(script_offset_f=0xffe000 from > > include/configs/rk3399_common.h) stored the programming script. > > So I'm not sure why we're adding distro boot support to SPI flash. What > is the reference platform storing there exactly? Thanks! I'm not sure I understand the question? we have rk3399 SBC's that boot from SPI and have feasibility to run distro boot using programming script store in flash offset like boot.scr does for MMC. _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
