Android工程之SD卡问题

最新推荐文章于 2025-04-01 20:20:21 发布

Tree_in_sea

最新推荐文章于 2025-04-01 20:20:21 发布

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本文链接：https://blog.youkuaiyun.com/Tree_in_sea/article/details/79034929

本文档总结了作者在xxx公司针对Android平台上SD卡出现的识别和读取不稳定问题进行的调试分析。通过分析内核log，发现了Error -123（无卡或卡损坏），Error -84（卡传输错误）和Error -110（卡识别问题）三种情况，并提出了相应的测试方法和解决思路。针对Error -123，建议检查SD卡状态和更换新卡；对于Error -84，建议改进硬件等长处理及信号质量，并延长软件中断去抖动时间；而对于Error -110，建议提升驱动能力或优化坏块检测代码。

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/*****************************************************************************
* Author : Elvins Fu yeyecheng_93@163.com
*
* Info : xxx Inc,(C) 2018-01-11, All rights revseved.
*
* Description : This document is summed up by the author for that the company of xxxs
* R&D debug SD card on the android platform。
*
* This context describes that sd card problem and methods to analysis.
****************************************************************************/

1.在调试SD卡的过程中，遇到了卡识别或者读取不稳定的情况，抓取log进行分析。

情况1:
--------------------------------------------------------------------------------------
[ 558.956332] mmc0: Re-init card rc = -123 (retries = 5)

[ 559.057076] mmc0: Re-init card rc = -123 (retries = 4)

[ 559.174989] mmc0: Re-init card rc = -123 (retries = 3)

[ 559.273596] mmc0: Re-init card rc = -123 (retries = 2)

[ 559.374437] mmc0: Re-init card rc = -123 (retries = 1)

[ 559.478705] mmc_sd_detect(mmc0): Unable to re-detect card (-123)

[ 559.489688] mmc0: card 0001 removed

情况2:
----------------------------------------------------------------------------------------------------
[ 8.682295] mmcblk0: mmc0:0260 SD 120 MiB

[ 8.684970] mmc0: data txfr (0x00200000) error: -84 after 0 ms

[ 8.684977] sdhci: =========== REGISTER DUMP (mmc0)===========

[ 8.684987] sdhci: Sys addr: 0x00000000 | Version: 0x00004902

[ 8.684997] sdhci: Blk size: 0x00004200 | Blk cnt: 0x00000007

[ 8.685010] sdhci: Argument: 0x00000000 | Trn mode: 0x00000033

[ 8.685019] sdhci: Present: 0x01f80206 | Host ctl: 0x0000001e

[ 8.685028] sdhci: Power: 0x0000000d | Blk gap: 0x00000000

[ 8.685037] sdhci: Wake