Eric Lee / smarc-uboot

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Commit 6cba327bd96f90818a8beede51405228c54a5251

Authored by Alexey Brodkin
1 parent 2a5062ca9e
Exists in smarc_8mq_lf_v2020.04 and in 17 other branches 8qm-imx_v2020.04_5.4.70_2.3.0, emb_lf_v2022.04, pitx_8mp_lf_v2020.04, smarc-8m-android-10.0.0_2.6.0, smarc-8m-android-11.0.0_2.0.0, smarc-8mp-android-11.0.0_2.0.0, smarc-imx6_v2018.03_4.14.98_2.0.0_ga, smarc-imx7_v2018.03_4.14.98_2.0.0_ga, smarc-imx_v2018.03_4.14.78_1.0.0_ga, smarc_8m-imx_v2018.03_4.14.98_2.0.0_ga, smarc_8m-imx_v2019.04_4.19.35_1.1.0, smarc_8m_00d0-imx_v2018.03_4.14.98_2.0.0_ga, smarc_8mm-imx_v2018.03_4.14.98_2.0.0_ga, smarc_8mm-imx_v2019.04_4.19.35_1.1.0, smarc_8mm-imx_v2020.04_5.4.24_2.1.0, smarc_8mp_lf_v2020.04, smarc_8mq-imx_v2020.04_5.4.24_2.1.0

arcv2: Halt non-master cores 

Even though we expect only master core to execute U-Boot code
let's make sure even if for some reason slave cores attempt to
execute U-Boot in parallel with master they get halted very early.

If platform wants it may kick-start slave cores before passing control
to say Linux kernel or any other application that want to see all cores
of SMP SoC up and running.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

Showing 1 changed file with 16 additions and 0 deletions Side-by-side Diff

arch/arc/lib/start.S
Diff comments   View file @ 6cba327
... ... @@ -10,6 +10,22 @@
10 10 #include <asm/arcregs.h>
11 11  
12 12 ENTRY(_start)
  13 + ; Non-masters will be halted immediately, they might be kicked later
  14 + ; by platform code right before passing control to the Linux kernel
  15 + ; in bootm.c:boot_jump_linux().
  16 + lr r5, [identity]
  17 + lsr r5, r5, 8
  18 + bmsk r5, r5, 7
  19 + cmp r5, 0
  20 + mov.nz r0, r5
  21 + bz .Lmaster_proceed
  22 + flag 1
  23 + nop
  24 + nop
  25 + nop
  26 +
  27 +.Lmaster_proceed:
  28 +
13 29 /* Setup interrupt vector base that matches "__text_start" */
14 30 sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]
15 31