* [PATCH] arm:pdu001: Use pseudo partition UUID for LINUX kernel boot paramter root
@ 2020-12-18 8:03 Felix Brack
2020-12-23 8:19 ` Lokesh Vutla
0 siblings, 1 reply; 2+ messages in thread
From: Felix Brack @ 2020-12-18 8:03 UTC (permalink / raw
To: u-boot
As more and more LINUX drivers are modified to use asynchronous probing
instead of synchronous probing, relying on device names being equal in
U-Boot and LINUX is not possible anymore. This is also true for block
device names like mmc0, mmc1 ect.
With LINUX kernel commit a1a4891 the probing type for the sdhci-omap
driver has been set to asynchronous mode too (probe_type is now
PROBE_PREFER_ASYNCHRONOUS).
In the case of the PDU001 board this results in the devices mmc0 and
mmc1 being swapped between U-Boot and LINUX. Device mmc0 in U-Boot
becomes mmc1 in LINUX an vice versa. Hence using device name identifiers
with LINUX kernel parameter root does not work anymore.
This patch changes the LINUX kernel boot parameter root to use the
pseudo (since we use MBR not GPT) partition UUID to locate the partition
hosting the root file system.
Signed-off-by: Felix Brack <fb@ltec.ch>
---
include/configs/pdu001.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/configs/pdu001.h b/include/configs/pdu001.h
index e4b14c5ecd..53342ce193 100644
--- a/include/configs/pdu001.h
+++ b/include/configs/pdu001.h
@@ -37,9 +37,10 @@
#define CONFIG_BOOTCOMMAND \
"run eval_boot_device;" \
+ "part uuid mmc ${mmc_boot}:${root_fs_partition} root_fs_partuuid;" \
"setenv bootargs console=${console} " \
"vt.global_cursor_default=0 " \
- "root=/dev/mmcblk${mmc_boot}p${root_fs_partition} " \
+ "root=PARTUUID=${root_fs_partuuid} " \
"rootfstype=ext4 " \
"rootwait " \
"rootdelay=1;" \
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] arm:pdu001: Use pseudo partition UUID for LINUX kernel boot paramter root
2020-12-18 8:03 [PATCH] arm:pdu001: Use pseudo partition UUID for LINUX kernel boot paramter root Felix Brack
@ 2020-12-23 8:19 ` Lokesh Vutla
0 siblings, 0 replies; 2+ messages in thread
From: Lokesh Vutla @ 2020-12-23 8:19 UTC (permalink / raw
To: u-boot
On 18/12/20 1:33 pm, Felix Brack wrote:
> As more and more LINUX drivers are modified to use asynchronous probing
> instead of synchronous probing, relying on device names being equal in
> U-Boot and LINUX is not possible anymore. This is also true for block
> device names like mmc0, mmc1 ect.
> With LINUX kernel commit a1a4891 the probing type for the sdhci-omap
> driver has been set to asynchronous mode too (probe_type is now
> PROBE_PREFER_ASYNCHRONOUS).
> In the case of the PDU001 board this results in the devices mmc0 and
> mmc1 being swapped between U-Boot and LINUX. Device mmc0 in U-Boot
> becomes mmc1 in LINUX an vice versa. Hence using device name identifiers
> with LINUX kernel parameter root does not work anymore.
> This patch changes the LINUX kernel boot parameter root to use the
> pseudo (since we use MBR not GPT) partition UUID to locate the partition
> hosting the root file system.
>
> Signed-off-by: Felix Brack <fb@ltec.ch>
Applied to u-boot-ti/for-next
Thanks and regards,
Lokesh
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-12-18 8:03 [PATCH] arm:pdu001: Use pseudo partition UUID for LINUX kernel boot paramter root Felix Brack
2020-12-23 8:19 ` Lokesh Vutla
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