A bug in the ZynqMP bootrom sets the PS_SYSMON_ANALOG_BUS register at 0xFFA50914 to the wrong value 0x3201. This causes the AMS to exchange the PS supply voltages 0 and 1. On Xilinx boards this is not noticable since these are tied together, it's only really noticable if banks 500 and 501 have different supplies. Xilinx' tech support reported this undocumented register to be the cause, and this patch applies a fix for all boards by programming the correct value.
Signed-off-by: Mike Looijmans <mike.looijm...@topic.nl> --- board/xilinx/zynqmp/zynqmp.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c index b94936474d..8d926c803b 100644 --- a/board/xilinx/zynqmp/zynqmp.c +++ b/board/xilinx/zynqmp/zynqmp.c @@ -326,6 +326,9 @@ int board_early_init_f(void) return ret; } +#define PS_SYSMON_ANALOG_BUS_VAL 0x3210 +#define PS_SYSMON_ANALOG_BUS_REG 0xFFA50914 + int board_init(void) { struct udevice *dev; @@ -343,6 +346,9 @@ int board_init(void) printf("EL Level:\tEL%d\n", current_el()); + /* Bug in ROM sets wrong value in this register */ + writel(PS_SYSMON_ANALOG_BUS_VAL, PS_SYSMON_ANALOG_BUS_REG); + #if defined(CONFIG_FPGA) && defined(CONFIG_FPGA_ZYNQMPPL) && \ !defined(CONFIG_SPL_BUILD) || (defined(CONFIG_SPL_FPGA_SUPPORT) && \ defined(CONFIG_SPL_BUILD)) -- 2.17.1 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot