Hello Sascha, On 20/6/19 16:32, Sascha Hauer wrote: > On Mon, Jun 17, 2019 at 05:07:39PM +0200, Ahmad Fatoum wrote: >> Ahmad Fatoum (12): >> ARM: stm32mp157c-dk2: add board-specific sysconf fixups Please drop this patch from next. >> ARM: psci: fix erroneous call of ->system_reset on system_off >> ARM: stm32mp: implement PSCI support >> ARM: stm32mp157c-dk2: boot kernel in nonsecure mode as well as these three. These patches duplicate functionality already existing in the upstream ARM Trusted Firmware-A repository. STMicro provides two boot chains for the STM32MP. A trusted boot chain, with the TF-A as the first stage boot loader doing the SDRAM init and U-Boot as the second stage as well as a simplified one where U-Boot SPL acts as a first stage. After talking this over with Lucas, I now see that barebox should probably not go down this road and instead settle for support of one of these boot chains. STMicro's docs[1] state that > authentication is optional with this boot chain, so it can run on any STM32MP > security variant (that is, with or without the Secure boot). > The trusted boot chain is the default solution delivered by STMicroelectronics, > with a complete feature set (for example, all Flash devices are supported). Which makes me lean towards settling for TF-A as first stage and have barebox focus on the second stage instead. Should it turn out, we should be doing first stage as well, these can always be reinstated in a way that doesn't break use of TF-A. Dropping them now allows a boot chain with mainline TF-A -> barebox with my network patches -> mainline Kernel to function. >> ARM: sm: move get_gicd_base_address to header for reuse Could be removed as well, but it doesn't hurt to leave it in. Future code for other subarches may need this as well. [1]: https://wiki.st.com/stm32mpu/wiki/Boot_chains_overview ¶2.2.1 Cheers Ahmad > > Applied, thanks > > Sascha > > -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
