MLK-20542 imx8qm: xen: mek: add magic number
Write magic number in board early init, and clear magic when booting
Linux.
This is to let XEN know the current EL1 code is U-Boot or Linux
when reset/reboot. This is just a workaround because CM41 could not
communicate with XEN now, even XEN knows that EL1 is reseting/rebooting.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Flynn xu <flynn.xu@nxp.com>
(cherry picked from commit 8132f6b5848d45cab795bb472d6484130985415d)
diff --git a/board/freescale/imx8qm_mek/imx8qm_mek.c b/board/freescale/imx8qm_mek/imx8qm_mek.c
index 2bd39a1..1b3d154 100644
--- a/board/freescale/imx8qm_mek/imx8qm_mek.c
+++ b/board/freescale/imx8qm_mek/imx8qm_mek.c
@@ -60,6 +60,13 @@
int board_early_init_f(void)
{
int ret;
+
+ /* When start u-boot in XEN VM, directly return */
+ if (IS_ENABLED(CONFIG_XEN)) {
+ writel(0xF53535F5, (void __iomem *)0x80000000);
+ return 0;
+ }
+
/* Set UART0 clock root to 80 MHz */
sc_pm_clock_rate_t rate = 80000000;
@@ -451,6 +458,12 @@
"dma_lpuart0",
};
+ if (IS_ENABLED(CONFIG_XEN)) {
+ /* Clear magic number to let xen know uboot is over */
+ writel(0x0, (void __iomem *)0x80000000);
+ return;
+ }
+
power_off_pd_devices(power_on_devices, ARRAY_SIZE(power_on_devices));
}
