From 03fb0958c9090eb3add089cb9f5a8a5ecb30ddf6 Mon Sep 17 00:00:00 2001 From: Sumit Garg Date: Mon, 26 Nov 2018 16:50:17 +0530 Subject: qemu-arm: Add persistent environment support Currently on qemu-arm platforms environment is kept in RAM. Instead use pflash device 1 to provide persistent environment support across device reset. Also (optionally) provide support for persistent environment across qemu machine OFF/ON using following instructions: - Create envstore.img using qemu-img: qemu-img create -f raw envstore.img 64M - Add a pflash drive parameter to the command line: -drive if=pflash,format=raw,index=1,file=envstore.img Signed-off-by: Sumit Garg --- doc/README.qemu-arm | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'doc/README.qemu-arm') diff --git a/doc/README.qemu-arm b/doc/README.qemu-arm index 260165638a..e67bc13f70 100644 --- a/doc/README.qemu-arm +++ b/doc/README.qemu-arm @@ -47,6 +47,12 @@ The minimal QEMU command line to get U-Boot up and running is: Note that for some odd reason qemu-system-aarch64 needs to be explicitly told to use a 64-bit CPU or it will boot in 32-bit mode. +Additional persistent U-boot environment support can be added as follows: +- Create envstore.img using qemu-img: + qemu-img create -f raw envstore.img 64M +- Add a pflash drive parameter to the command line: + -drive if=pflash,format=raw,index=1,file=envstore.img + Additional peripherals that have been tested to work in both U-Boot and Linux can be enabled with the following command line parameters: -- cgit