> From: Simon Glass <s...@chromium.org> > Date: Wed, 2 Jan 2019 18:15:31 -0700 > > Hi Kever, > > I have a firefly-rk3399 and would like to boot it into U-Boot (as a start) > from an uSD card. > > Are there instructions somewhere on how to do this? I gather that I need > OP-TEE but not how to build it or how to put the image together. I would > like to have instructions in README.rockchip if possible. > > I'm planning to add U-Boot support for bob and maybe kevin (both > Chromebooks) but am not sure where to start. I thought the firefly might be > best since it is pretty common.
Hi Simon, The instructions in board/u-boot/rockchip/evb_rk3399/README apply to the firefly-rk3399 as well. I've successfully built working firmware for my board using the TF-A (ATF) 2.0 release and U-Boot SPL in the past that way. One complication with the firefly board is that by default it boots from eMMC, so you can't easily test new firmware by putting it on uSD card unless you make the eMMC unbootable somehow (e.g. by overwriting the start of the eMMC storage with zeroes). In that case you can boot from uSD card if you write U-Boot SPL and U-Boot proper at the right offsets: # dd if=idbspl.img of=/dev/sd1c seek=64 # dd if=u-boot.itb of=/dev/sd1c seek=16384 (that's on OpenBSD, on Linux the device names will be different) Haven't tested flashing eMMC with rkdeveloptool myself, but that should work on the firefly as well. Another complication as that the serial console speed defaults to 1500000 which isn't supported by all serial-to-USB chips and frankly too sensitive to wire noise. Also be aware that TF-A built from the official ARM sources at https://github.com/ARM-software/arm-trusted-firmware.git defaults to 115200 (which is more reasonable IMHO). So I have the following diff in my U-Boot tree. The device tree change comes in handy if you want to boot from uSD card, otherwise U-Boot SPL will attempt to load the full U-Boot from eMMC. Perhaps that bit should be committed at some point. Having support for bob would be great. I have one, and would like to make OpenBSD run on it. Cheers, Mark diff --git a/arch/arm/dts/rk3399-firefly.dts b/arch/arm/dts/rk3399-firefly.dts index be350866a7..f90e7e88db 100644 --- a/arch/arm/dts/rk3399-firefly.dts +++ b/arch/arm/dts/rk3399-firefly.dts @@ -15,7 +15,7 @@ chosen { stdout-path = &uart2; - u-boot,spl-boot-order = &sdhci, &sdmmc; + u-boot,spl-boot-order = "same-as-spl", &sdhci, &sdmmc; }; backlight: backlight { diff --git a/configs/firefly-rk3399_defconfig b/configs/firefly-rk3399_defconfig index 7ac4064a8b..01b3a0771f 100644 --- a/configs/firefly-rk3399_defconfig +++ b/configs/firefly-rk3399_defconfig @@ -58,7 +58,7 @@ CONFIG_REGULATOR_RK8XX=y CONFIG_PWM_ROCKCHIP=y CONFIG_RAM=y CONFIG_SPL_RAM=y -CONFIG_BAUDRATE=1500000 +CONFIG_BAUDRATE=115200 CONFIG_DEBUG_UART_SHIFT=2 CONFIG_SYSRESET=y CONFIG_USB=y _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
