On Fri, Mar 31, 2023 at 05:42:54PM +0200, Michael Riesch wrote: > Hi Sascha, > > On 3/28/23 09:40, Sascha Hauer wrote: > > This series adds support for reading the amount of memory from > > the DDR controller. This helps on boards which come with > > different amounts of memory like the Radxa Rock3a. > > > > This series also fixes issues with an upstream TF-A firmware. With this > > the IRAM where the bootsource is stored is no longer accessible in > > normal mode. We have to read its contents before starting the TF-A. > > For this it became necessary to add a common barebox entry function > > for rk3568, to get a common place to read the IRAM contents. > > Nice, thanks for your efforts! Now it should be possible to remove the > memory nodes from arch/arm/dts/rk356*, right? > > I tried this on a ROCK3A with 8 GB and the memory calculation returned > the correct result. There are now two ram devices > > `-- mem0 > `-- 0x00000000-0x10fffffff ( 4.3 GiB): /dev/ram1 > `-- mem1 > `-- 0x00000000-0xef5fffff ( 3.7 GiB): /dev/ram0 > `-- mem2 > `-- 0x00000000-0xffffffffffffffff ( 0 Bytes): /dev/mem At first sight I was a bit puzzled that both memory regions start a 0x0. That's correct for the devinfo output of course. The output of 'iomem' would show the situation better here. > > that start at SZ_4G and 0xa00000, respectively. > > However, after loading the kernel the system hangs: > > Loaded kernel to 0x100000000, devicetree at 0x101970000 > > Is this a bug in barebox or is something special required to boot the > kernel from SZ_4G? I would have guessed that barebox puts the kernel below the malloc area just as usual. Ok, apparently it doesn't. I haven't found anything in Documentation/arm64/booting.rst that forbids placing the kernel above the 32bit boundary. You could verify that the memory nodes barebox writes meet your expectations by adding some -v to the boot command. Also earlycon might help to get some output from the kernel. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
