On Wed, Nov 28, 2018 at 05:24:45AM +0100, Heiko Schocher wrote: > Hello Marek, Jagan, > > Am 27.11.2018 um 13:10 schrieb Marek Vasut: > >On 11/27/2018 06:51 AM, Jagan Teki wrote: > >>On Mon, Nov 26, 2018 at 12:48 PM Peng Fan <peng....@nxp.com> wrote: > >>> > >>>Hi Jagan, > >>> > >>>Just have a quick question here. > >>> > >>>After dropping non-DM code, for SPL use non-DM code should switch to > >>>SPL_DM and use SPL OF CONTROL? > >> > >>Here are the options, that we dealt based on the size constraints > >>1) try to use DM_SPL with SPL OF_CONTROL > > > >Not possible > > > >>2) try PLATDATA > > > >Adds extra bloat to SPLs which are already borderline, so not possible. > > > >>3) try TPL for truly small size > > > >How would that help ? I don't need extra level of bootloader, I can use > >SPL right now. > > Exactly my thoughts too. I have a at91 based board (smartweb) in mainline > where the SPL fits into 4k sram ... no chance for 1) or 2) ... > > I see the reasons for integrating more and more stuff into SPL, but > it should be possible to build a small SPL ... > > Hopefully TPL stays really small ...
Staying small is the stated goal of TPL. And it's not impossible that something like smartweb will need to switch to something like TPL->U-Boot. > Hmm.. while writting (did not actually looked into TPL ...): > > Is it possible to boot U-boot directly from TPL ? No reason why not, so long as everything U-Boot needs is setup, just like always. > >>if none works, we can see the other option. may be some glue code to > >>read flash for SPL or something else. > > > >I'll have to take a look at the Renesas Gen2, but probably next year. > > I talk with customers to get time for converting, but this also may > take some time ... I understand this concern, but, things have been converting for years. I continue to be happy to hear and welcome additional technical problems that need to be solved, but by that same token, I want to be clear that "I think we just can't convert $X to DM for full U-Boot" or similar aren't arguments I'm very receptive to. -- Tom
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