On Thu, Jan 23, 2020 at 10:59:17PM +0530, Jagan Teki wrote: > On Thu, Jan 23, 2020 at 10:45 PM Tom Rini <trini@xxxxxxxxxxxx> wrote: > > > > On Thu, Jan 23, 2020 at 10:41:15PM +0530, Jagan Teki wrote: > > > 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. > > > > OK, and what distro(s) today are doing that? I'm not happy with this > > patch as it's growing hundreds (literally) of boards in size and I'd > > like to know what is leveraging this functionality today, or is going to > > be as soon as it's upstream and widely available. Thanks! > > Not sure about the possibility more boards using this at this point, > but I was initially created custom to rockchip and feel that it would > be useful to rest if it's generic. May be will split into rockchip > area if it's eating too much footprint. Yes, the "distro boot" functionality refers to what we need to allow boards to easily Just Work with standard off the shelf *nix distributions. Thanks! -- Tom
Attachment:
signature.asc
Description: PGP signature
_______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
