netdev - Re: [PATCH linux-can-next/flexcan 1/4] can: flexcan: initialize all flexcan memory for ECC function

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Date:   Fri, 25 Sep 2020 09:33:20 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Joakim Zhang <qiangqing.zhang@....com>, linux-can@...r.kernel.org
Cc:     linux-imx@....com, netdev@...r.kernel.org
Subject: Re: [PATCH linux-can-next/flexcan 1/4] can: flexcan: initialize all
 flexcan memory for ECC function

On 9/25/20 5:10 PM, Joakim Zhang wrote:
> There is a NOTE at the section "Detection and correction of memory errors":
> All FlexCAN memory must be initialized before starting its operation in
> order to have the parity bits in memory properly updated. CTRL2[WRMFRZ]
> grants write access to all memory positions that require initialization,
> ranging from 0x080 to 0xADF and from 0xF28 to 0xFFF when the CAN FD feature
> is enabled. The RXMGMASK, RX14MASK, RX15MASK, and RXFGMASK registers need to
> be initialized as well. MCR[RFEN] must not be set during memory initialization.
> 
> Memory range from 0x080 to 0xADF, there are reserved memory (unimplemented
> by hardware), these memory can be initialized or not.
> 
> Initialize all FlexCAN memory before accessing them, otherwise, memory
> errors may be detected. The internal region cannot be initialized when
> the hardware does not support ECC.
> 
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>

Is this whole patch valid/compatible with the mx7,too?

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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