From: Sean Anderson <seanga2@gmail.com>
To: u-boot@lists.denx.de
Subject: [PATCH 0/7] riscv: Correctly handle IPIs already pending upon boot
Date: Tue, 8 Sep 2020 22:44:06 -0400 [thread overview]
Message-ID: <ff70b2a8-b119-64ef-3533-30fb95828cda@gmail.com> (raw)
In-Reply-To: <9b45823d-77e2-bb48-a1d5-cda9221f2b47@gmail.com>
On 9/8/20 10:38 PM, Sean Anderson wrote:
> On 9/8/20 10:02 PM, Rick Chen wrote:
>> Hi Sean
>>
>>> On the K210, the prior stage bootloader does not clear IPIs. This presents
>>> a problem, because U-Boot up until this point assumes (with one exception)
>>> that IPIs are cleared when it starts. This series attempts to fix this in a
>>> robust manner, and fix several concurrency bugs I noticed while fixing
>>> these other areas. Heinrich previously submitted a patch addressing part of
>>> this problem in [1].
>>>
>>> [1] https://patchwork.ozlabs.org/project/uboot/patch/20200811035648.3284-1-xypron.glpk at gmx.de/
>>>
>>
>> It sounds like that the bootloader does not deal with SMP flow well
>> and jump to u-boot-spl, right ?
>>
>> I have a question that why not try to fix the prior stage bootloader
>> to clear IPIs correctly?
>
> Because it is a ROM :)
Err, perhaps I should clarify. When I say "prior stage bootloader," I
mean that in the general sense of "anything which comes before U-Boot,"
and not to refer specifically to SPL or TPL. For the k210, this is
something akin to the ZSBL on an fu540.
--Sean
next prev parent reply other threads:[~2020-09-09 2:44 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-07 18:16 [PATCH 0/7] riscv: Correctly handle IPIs already pending upon boot Sean Anderson
2020-09-07 18:16 ` [PATCH 1/7] Revert "riscv: Clear pending interrupts before enabling IPIs" Sean Anderson
2020-09-09 7:50 ` Rick Chen
2020-09-09 10:23 ` Sean Anderson
2020-09-10 6:39 ` Rick Chen
2020-09-10 10:18 ` Sean Anderson
2020-09-11 7:38 ` Bin Meng
2020-09-11 10:22 ` Sean Anderson
2020-09-11 14:45 ` Bin Meng
2020-09-11 18:30 ` Sean Anderson
2020-09-14 3:10 ` Rick Chen
2020-09-14 12:45 ` Sean Anderson
2020-09-07 18:16 ` [PATCH 2/7] riscv: Match memory barriers between send_ipi_many and handle_ipi Sean Anderson
2020-09-11 7:45 ` Bin Meng
2020-09-07 18:16 ` [PATCH 3/7] riscv: Use NULL as a sentinel value for smp_call_function Sean Anderson
2020-09-09 8:33 ` Rick Chen
2020-09-09 9:01 ` Rick Chen
2020-09-09 10:16 ` Sean Anderson
2020-09-09 10:26 ` Heinrich Schuchardt
2020-09-09 10:36 ` Sean Anderson
2020-09-10 8:09 ` Rick Chen
2020-09-14 3:21 ` Rick Chen
2020-09-11 8:04 ` Bin Meng
2020-09-14 1:58 ` Leo Liang
2020-09-14 2:07 ` Bin Meng
2020-09-14 6:10 ` Leo Liang
2020-09-14 6:15 ` Bin Meng
2020-09-14 14:05 ` Sean Anderson
2020-09-07 18:16 ` [PATCH 4/7] riscv: Clear pending IPIs on initialization Sean Anderson
2020-09-14 2:08 ` Bin Meng
2020-09-07 18:16 ` [PATCH 5/7] riscv: Add fence to available_harts_lock Sean Anderson
2020-09-10 3:26 ` Rick Chen
2020-09-11 10:39 ` Sean Anderson
2020-09-11 14:47 ` Bin Meng
2020-09-07 18:16 ` [PATCH 6/7] riscv: Ensure gp is NULL or points to valid data Sean Anderson
2020-09-14 5:25 ` Bin Meng
2020-09-14 13:03 ` Sean Anderson
2020-09-14 13:27 ` Sean Anderson
2020-09-07 18:16 ` [PATCH 7/7] riscv: Add some comments to start.S Sean Anderson
2020-09-14 5:26 ` Bin Meng
2020-09-09 2:02 ` [PATCH 0/7] riscv: Correctly handle IPIs already pending upon boot Rick Chen
2020-09-09 2:38 ` Sean Anderson
2020-09-09 2:44 ` Sean Anderson [this message]
2020-09-10 7:08 ` Rick Chen
2020-09-10 10:49 ` Sean Anderson
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