Hi, Am 14.05.2017 um 04:24 schrieb Andreas Färber: > This mini-series adds initial support for the Realtek RTD1295 SoC and > the Zidoo X9S TV box. > > v3 changes #address-cells, #size-cells and ranges. > > With these patches CPU0 can be booted with earlycon. > > PSCI doesn't work despite present in the vendor device tree; as enable-method > it instead used a custom "rtk-spin-table" that I sadly have no source code of. Synology has now published source code for RTD1293/1296. This has allowed me to narrow the RTD1295 CPU1..3 issue down to two changes in arch/arm64/kernel/smp_spin_table.c:smp_spin_table_cpu_prepare(): 1) writel_relaxed() instead of writeq_relaxed() 2) ioremap() instead of ioremap_cache() Without those changes it hangs in earlycon after this line: [ 0.043674] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes) The size difference sounds easy enough - we could introduce an optional cpu-release-size property to handle this or derive a "spin-table-32bit" enable-method to that effect. The second one appears to be caused by PROT_NORMAL vs. PROT_DEVICE_nGnRE. Is there any simple check we could do on cpu-release-addr to choose which MT to use? https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=113954c6463d1d80a206e91627ae49711f8b47cd Any other ideas? [...] > The boot process is slightly twisted: The files need to be loaded from a > 32-bit U-Boot, then boot into 64-bit U-Boot where the kernel can be booted. > Similar to my previous Amlogic S905 work, the TEXT_OFFSET poses a problem, so > a uImage needs to be used (or the kernel patched) for load address 0x00280000. > I haven't succeeded loading an initrd via bootm/booti; but as quick workaround > initrd=$rootfs_loadaddr,0x$filesize can manually be specified in $bootargs. > > Cf. https://en.opensuse.org/HCL:Zidoo_X9S > > More experimental patches at: > https://github.com/afaerber/linux/commits/rtd1295-next [snip] My above branch includes the above spin-table hack for now. Regards, Andreas -- SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
