On Wed, Dec 22, 2010 at 1:20 AM, Philip Rakity <prakity@xxxxxxxxxxx> wrote:
>
> On Dec 21, 2010, at 10:14 PM, zhangfei gao wrote:
>
>> On Wed, Dec 22, 2010 at 12:52 AM, Philip Rakity <prakity@xxxxxxxxxxx> wrote:
>>>
>>> On Dec 21, 2010, at 9:37 PM, zhangfei gao wrote:
>>>
>>>> On Wed, Dec 22, 2010 at 12:09 AM, Philip Rakity <prakity@xxxxxxxxxxx> wrote:
>>>>>
>>>>> Resend as plain test -- with additional comments.
>>>>> On Dec 21, 2010, at 4:37 AM, zhangfei gao wrote:
>>>>>
>>>>>> v3: sync to mmc-next
>>>>>>
>>>>>> Emmc speed could double if using ddr50 mode, help check
>>>>>>
>>>>>> From 895c3d15a200d5f5803f992dab46ff114ad26f90 Mon Sep 17 00:00:00 2001
>>>>>> From: Zhangfei Gao <zhangfei.gao@xxxxxxxxxxx>
>>>>>> Date: Tue, 21 Dec 2010 19:51:38 -0500
>>>>>> Subject: [PATCH] mmc: sdhci support emmc ddr50 mode
>>>>>>
>>>>>> 1. spec sdhc 3.0 does not claim support 1.2v ddr mode
>>>>>> 2. Call back function set_power is added, since some controller count
>>>>>> on external pmic to provide power
>>>>>> 3. According to spec sdhc 3.0, uhs mode, including emmc ddr50 takes
>>>>>> effect only when 1.8v Signaling Enable bit, which used for providing
>>>>>> 1.8v.
>>>>>> So emmc ddr50 mode works after 1.8v switching process, though emmc
>>>>>> ddr50 could work at high voltage such as 3.3v if external pmic provide
>>>>>> voltage.
>>>>>> Limitation: emmc ddr50 mode only workable when both host and emmc
>>>>>> card support 1.70-1.90v
>>>>>
>>>>>
>>>>> signaling voltage is not the same as card voltage. card voltage can be 3.3v and
>>>>> signaling voltage 1.8v.
>>>> My understanding is signal voltage is io voltage, which could be low
>>>> voltage, 1.70~1.90v.
>>>> Card voltage should be keeps high voltage.
>>>> In fact, two power domain inside emmc, one is vcc, the other is vccq,
>>>> this is control io domain.
>>>>>
>>>>>> 4. According to JESD84, power down and power up is required to
>>>>>> provide low voltage 1.70-1.90v to mmc.
>>>>>>
>>>>>> Verified: toshiba emmc on mmp2, with io voltage at 1.8v provided by
>>>>>> external pmic.
>>>>>>
>>>>>> Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxxx>
>>>>>> ---
>>>>>> drivers/mmc/core/core.c | 13 +++++++++++++
>>>>>> drivers/mmc/core/core.h | 1 +
>>>>>> drivers/mmc/core/mmc.c | 6 +++++-
>>>>>> drivers/mmc/host/sdhci.c | 44 +++++++++++++++++++++++++++++++++++++++++---
>>>>>> drivers/mmc/host/sdhci.h | 14 +++++++++++++-
>>>>>> 5 files changed, 73 insertions(+), 5 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>>>>>> index a8e89f3..fd657f1 100644
>>>>>> --- a/drivers/mmc/core/core.c
>>>>>> +++ b/drivers/mmc/core/core.c
>>>>>> @@ -1012,6 +1012,19 @@ static void mmc_power_off(struct mmc_host *host)
>>>>>> }
>>>>>>
>>>>>> /*
>>>>>> + * mmc select low voltage 1.70-1.95v
>>>>>> + */
>>>>>> +void mmc_select_low_voltage(struct mmc_host *host, u32 ocr)
>>>>>> +{
>>>>>> + if (!(ocr & MMC_VDD_165_195))
>>>>>> + return;
>>>>>> +
>>>>>> + mmc_power_off(host);
>>>>>> + host->ocr = ocr & host->ocr_avail;
>>>>>> + mmc_power_up(host);
>>>>>> +}
>>>>>> +
>>>>>> +/*
>>>>>> * Cleanup when the last reference to the bus operator is dropped.
>>>>>> */
>>>>>> static void __mmc_release_bus(struct mmc_host *host)
>>>>>> diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
>>>>>> index 026c975..b05c20a 100644
>>>>>> --- a/drivers/mmc/core/core.h
>>>>>> +++ b/drivers/mmc/core/core.h
>>>>>> @@ -41,6 +41,7 @@ void mmc_set_bus_width(struct mmc_host *host,
>>>>>> unsigned int width);
>>>>>> void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width,
>>>>>> unsigned int ddr);
>>>>>> u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
>>>>>> +void mmc_select_low_voltage(struct mmc_host *host, u32 ocr);
>>>>>> void mmc_set_timing(struct mmc_host *host, unsigned int timing);
>>>>>>
>>>>>> static inline void mmc_delay(unsigned int ms)
>>>>>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>>>>>> index 86cac0d..8779339 100644
>>>>>> --- a/drivers/mmc/core/mmc.c
>>>>>> +++ b/drivers/mmc/core/mmc.c
>>>>>> @@ -790,7 +790,11 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
>>>>>> ocr &= ~0x7F;
>>>>>> }
>>>>>>
>>>>>> - host->ocr = mmc_select_voltage(host, ocr);
>>>>>> + if ((ocr & MMC_VDD_165_195)
>>>>>> + && (host->ocr_avail & MMC_VDD_165_195))
>>>>>> + mmc_select_low_voltage(host, ocr);
>>>>>> + else
>>>>>> + host->ocr = mmc_select_voltage(host, ocr);
>>>>>>
>>>>>
>>>>> The patch for dual voltage cards should be a separate patch. It is independent of
>>>>> support for dual data rate.
>>>>>
>>>>>> /*
>>>>>> * Can we support the voltage of the card?
>>>>>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>>>>>> index d5febe5..aafbb42 100644
>>>>>> --- a/drivers/mmc/host/sdhci.c
>>>>>> +++ b/drivers/mmc/host/sdhci.c
>>>>>> @@ -986,6 +986,22 @@ static void sdhci_finish_command(struct sdhci_host *host)
>>>>>> host->cmd = NULL;
>>>>>> }
>>>>>>
>>>>>> +static void sdhci_set_ddr(struct sdhci_host *host, unsigned int ddr)
>>>>>> +{
>>>>>> + u16 con;
>>>>>> +
>>>>>> + if (ddr == MMC_SDR_MODE)
>>>>>> + return;
>>>>>> +
>>>>>> + con = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>>>>>> + if (con & SDHCI_CTRL2_1_8V) {
>>>>>> + con &= ~SDHCI_CTRL2_UHS_MASK;
>>>>>> + if (ddr & MMC_1_8V_DDR_MODE)
>>>>>> + con |= SDHCI_CTRL2_DDR50;
>>>>>> + sdhci_writew(host, con, SDHCI_HOST_CONTROL2);
>>>>>> + }
>>>>>> +}
>>>>>> +
>>>>>> static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
>>>>>> {
>>>>>> int div;
>>>>>> @@ -1084,6 +1100,18 @@ static void sdhci_set_power(struct sdhci_host
>>>>>> *host, unsigned short power)
>>>>>> return;
>>>>>> }
>>>>>>
>>>>>> + if ((pwr == SDHCI_POWER_180) &&
>>>>>> + (host->mmc->caps & MMC_CAP_1_8V_DDR)) {
>>>>>> + u16 con;
>>>>>> +
>>>>>> + con = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>>>>>> + con |= SDHCI_CTRL2_1_8V;
>>>>>> + sdhci_writew(host, con, SDHCI_HOST_CONTROL2);
>>>>>> +
>>>>>> + if (host->ops->set_power)
>>>>>> + host->ops->set_power(host, pwr);
>>>>>> + }
>>>>>> +
>>>>>
>>>>> power to the card can be at 3.3v and signaling at 1.8v. This is a legal combination.
>>>>
>>>> It is legal combination, then why here should be reworked?
>>>> The Power control register is control SD bus voltage, which should be
>>>> io voltage.
>>>> Even the dual voltage emmc card can not work at both vcc and vccq are 1.8v.
>>>>
>>>>> The
>>>>>> + if ((pwr == SDHCI_POWER_180) &&
>>>>>> + (host->mmc->caps & MMC_CAP_1_8V_DDR)) {
>>>>> should be reworked.
>>>>>
>>>>>> /*
>>>>>> * Spec says that we should clear the power reg before setting
>>>>>> * a new value. Some controllers don't seem to like this though.
>>>>>> @@ -1180,6 +1208,7 @@ static void sdhci_set_ios(struct mmc_host *mmc,
>>>>>> struct mmc_ios *ios)
>>>>>> }
>>>>>>
>>>>>> sdhci_set_clock(host, ios->clock);
>>>>>> + sdhci_set_ddr(host, ios->ddr);
>>>>>>
>>>>>> if (ios->power_mode == MMC_POWER_OFF)
>>>>>> sdhci_set_power(host, -1);
>>>>>> @@ -1744,7 +1773,7 @@ EXPORT_SYMBOL_GPL(sdhci_alloc_host);
>>>>>> int sdhci_add_host(struct sdhci_host *host)
>>>>>> {
>>>>>> struct mmc_host *mmc;
>>>>>> - unsigned int caps, ocr_avail;
>>>>>> + unsigned int caps, caps_h = 0, ocr_avail;
>>>>>> int ret;
>>>>>>
>>>>>> WARN_ON(host == NULL);
>>>>>> @@ -1767,8 +1796,17 @@ int sdhci_add_host(struct sdhci_host *host)
>>>>>> host->version);
>>>>>> }
>>>>>>
>>>>>> - caps = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
>>>>>> - sdhci_readl(host, SDHCI_CAPABILITIES);
>>>>>> + if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
>>>>>> + caps = host->caps;
>>>>>> + else {
>>>>>> + caps = sdhci_readl(host, SDHCI_CAPABILITIES);
>>>>>> + caps_h = sdhci_readl(host, SDHCI_CAPABILITIES_1);
>>>>>> + }
>>>>>> +
>>>>>> + if (caps & SDHCI_CAN_VDD_180) {
>>>>>> + if (caps_h & SDHCI_CAN_SDR50)
>>>>>> + mmc->caps |= (MMC_CAP_1_8V_DDR);
>>>>>> + }
>>>>>>
>>>>>> if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
>>>>>> host->flags |= SDHCI_USE_SDMA;
>>>>>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>>>>>> index 6e0969e..c4bd5dd 100644
>>>>>> --- a/drivers/mmc/host/sdhci.h
>>>>>> +++ b/drivers/mmc/host/sdhci.h
>>>>>> @@ -145,7 +145,14 @@
>>>>>>
>>>>>> #define SDHCI_ACMD12_ERR 0x3C
>>>>>>
>>>>>> -/* 3E-3F reserved */
>>>>>> +#define SDHCI_HOST_CONTROL2 0x3E
>>>>>> +#define SDHCI_CTRL2_UHS_MASK 0x0007
>>>>>> +#define SDHCI_CTRL2_SDR12 0x0000
>>>>>> +#define SDHCI_CTRL2_SDR25 0x0001
>>>>>> +#define SDHCI_CTRL2_SDR50 0x0002
>>>>>> +#define SDHCI_CTRL2_SDR104 0x0003
>>>>>> +#define SDHCI_CTRL2_DDR50 0x0004
>>>>>> +#define SDHCI_CTRL2_1_8V 0x0008
>>>>>>
>>>>>> #define SDHCI_CAPABILITIES 0x40
>>>>>> #define SDHCI_TIMEOUT_CLK_MASK 0x0000003F
>>>>>> @@ -167,6 +174,9 @@
>>>>>> #define SDHCI_CAN_64BIT 0x10000000
>>>>>>
>>>>>> #define SDHCI_CAPABILITIES_1 0x44
>>>>>> +#define SDHCI_CAN_SDR50 0x00000001
>>>>>> +#define SDHCI_CAN_SDR104 0x00000002
>>>>>> +#define SDHCI_CAN_DDR50 0x00000004
>>>>>>
>>>>>> #define SDHCI_MAX_CURRENT 0x48
>>>>>>
>>>>>> @@ -222,6 +232,8 @@ struct sdhci_ops {
>>>>>> void (*platform_send_init_74_clocks)(struct sdhci_host *host,
>>>>>> u8 power_mode);
>>>>>> unsigned int (*get_ro)(struct sdhci_host *host);
>>>>>> + unsigned int (*set_power)(struct sdhci_host *host,
>>>>>> + unsigned short power);
>>>>>> };
>>>>>>
>>>>>> #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
>>>>>> --
>>>>>> 1.7.0.4
>>>>>> <0001-mmc-sdhci-support-emmc-ddr50-mode.patch>
>>>>>
>>>>>
>>>
>>>
>>> commented out support for 1.8v in sdhci.c where the check was made for the controller supporting 1.8v core voltage
>>> added printk to show ocr and host->ocr. before check to call mmc_select_low_voltage or mmc_select_voltage in mmc.c
>>>
>>> the card is recognized as DDR but we do not mount the drive since the check for SDHCI_POWER_180 fails and we do not program the registers.
>>>
>>>
>>>
>>> [ 0.000000] Linux version 2.6.37-rc6-next-20101220-00023-ge7c195e-dirty (philip@philip-laptop) (gcc version 4.2.0 20070413 (prerelease) (CodeSourcery 2007q1-10. Marvell 2009q3-18 20090821)) #80 PREEMPT 0
>>> [ 0.000000] CPU: Marvell PJ4 processor [560f5815] revision 5 (ARMv7), cr=00c5387f
>>> [ 0.000000] CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
>>> [ 0.000000] Machine: Brownstone Development Platform
>>> [ 0.000000] Ignoring unrecognised tag 0x41000403
>>> [ 0.000000] Memory policy: ECC disabled, Data cache writeback
>>> [ 0.000000] On node 0 totalpages: 131072
>>> [ 0.000000] free_area_init_node: node 0, pgdat c03713d8, node_mem_map c0390000
>>> [ 0.000000] Normal zone: 1024 pages used for memmap
>>> [ 0.000000] Normal zone: 0 pages reserved
>>> [ 0.000000] Normal zone: 130048 pages, LIFO batch:31
>>> [ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
>>> [ 0.000000] pcpu-alloc: [0] 0
>>> [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 130048
>>> [ 0.000000] Kernel command line: debug rootdelay=15 root=/dev/mmcblk0p1 rootfstype=ext3 console=ttyS2,38400 mem=512M uart_dma mbr_offset=0x4800
>>> [ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
>>> [ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
>>> [ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
>>> [ 0.000000] Memory: 512MB = 512MB total
>>> [ 0.000000] Memory: 516108k/516108k available, 8180k reserved, 0K highmem
>>> [ 0.000000] Virtual kernel memory layout:
>>> [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
>>> [ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
>>> [ 0.000000] DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
>>> [ 0.000000] vmalloc : 0xe0800000 - 0xfe000000 ( 472 MB)
>>> [ 0.000000] lowmem : 0xc0000000 - 0xe0000000 ( 512 MB)
>>> [ 0.000000] modules : 0xbf000000 - 0xc0000000 ( 16 MB)
>>> [ 0.000000] .init : 0xc0008000 - 0xc001f000 ( 92 kB)
>>> [ 0.000000] .text : 0xc001f000 - 0xc035400c (3285 kB)
>>> [ 0.000000] .data : 0xc0356000 - 0xc0373040 ( 117 kB)
>>> [ 0.000000] Preemptable hierarchical RCU implementation.
>>> [ 0.000000] RCU-based detection of stalled CPUs is disabled.
>>> [ 0.000000] Verbose stalled-CPUs detection is disabled.
>>> [ 0.000000] NR_IRQS:320 nr_irqs:360 360
>>> [ 0.000000] sched_clock: 32 bits at 6MHz, resolution 153ns, wraps every 660764ms
>>> [ 0.000000] Console: colour dummy device 80x30
>>> [ 0.000166] Calibrating delay loop... 796.26 BogoMIPS (lpj=3981312)
>>> [ 0.220135] pid_max: default: 32768 minimum: 301
>>> [ 0.220328] Mount-cache hash table entries: 512
>>> [ 0.220328] CPU: Testing write buffer coherency: ok
>>> [ 0.224398] print_constraints: dummy: regulator:
>>> [ 0.224525] NET: Registered protocol family 16
>>> [ 0.224525] Tauros2: Disabling L2 prefetch.
>>> [ 0.224569] Tauros2: L2 cache support initialised in ARMv6 mode.
>>> [ 0.227737] bio: create slab <bio-0> at 0
>>> [ 0.228950] Switching to clocksource clocksource
>>> [ 0.233848] NET: Registered protocol family 2
>>> [ 0.234150] IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
>>> [ 0.234482] TCP established hash table entries: 16384 (order: 5, 131072 bytes)
>>> [ 0.234482] TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
>>> [ 0.234733] TCP: Hash tables configured (established 16384 bind 16384)
>>> [ 0.234863] TCP reno registered
>>> [ 0.234878] UDP hash table entries: 256 (order: 0, 4096 bytes)
>>> [ 0.234878] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
>>> [ 0.234901] NET: Registered protocol family 1
>>> [ 0.235444] RPC: Registered udp transport module.
>>> [ 0.235444] RPC: Registered tcp transport module.
>>> [ 0.235462] RPC: Registered tcp NFSv4.1 backchannel transport module.
>>> [ 0.237177] JFFS2 version 2.2. (NAND) .. 2001-2006 Red Hat, Inc.
>>> [ 0.237177] msgmni has been set to 1008
>>> [ 0.238053] io scheduler noop registered
>>> [ 0.238087] io scheduler deadline registered
>>> [ 0.238104] io scheduler cfq registered (default)
>>> [ 0.238679] pxa2xx-uart.0: ttyS0 at MMIO 0xd4030000 (irq = 27) is a FFUART
>>> [ 0.238852] pxa2xx-uart.2: ttyS2 at MMIO 0xd4018000 (irq = 24) is a STUART
>>> [ 1.353048] console [ttyS2] enabled
>>> [ 1.364154] mousedev: PS/2 mouse device common for all mice
>>> [ 1.380867] sdhci: Secure Digital Host Controller Interface driver
>>> [ 1.399304] sdhci: Copyright(c) Pierre Ossman
>>> [ 1.412378] mmc0: no vmmc regulator found
>>> [ 1.424539] mmc0: SDHCI controller on MMC [sdhci-pxa.2] using ADMA
>>> [ 1.443030] mmc1: no vmmc regulator found
>>> [ 1.455203] mmc1: SDHCI controller on MMC [sdhci-pxa.0] using ADMA
>>> [ 1.474554] mmc2: no vmmc regulator found
>>> [ 1.486636] mmc2: SDHCI controller on MMC [sdhci-pxa.1] using ADMA
>>> [ 1.505238] TCP cubic registered
>>> [ 1.514889] NET: Registered protocol family 17
>>> [ 1.529176] Registering the dns_resolver key type
>>> [ 1.545330] VFP support v0.3: implementor 56 architecture 2 part 20 variant 9 rev 5
>>> [ 1.568612] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
>>> [ 1.587543] Waiting 15sec before mounting root device...
>>> [ 1.604984] mmc_attach_mmc:mmc0: ocr & MMC_VDD_165_195 = 80, host->ocr_avail & MMC_VDD_165_195 = 0
>>
>> Here something wrong, host->ocr_avail should have 0x80, otherwise ocr
>> can not get ox80 back,
>> Could you try the patch send you this morning, which is tested based
>> on mmc-next.
>>
>
>
> The host controller is NOT required to support 1.8v. mmp2 supports this and to show the bug
> I commented out support for this as I mentioned above. If 1.8v core voltage is not supported
> by the controller by code break.
I think we should conform to spec first, then consider the special requirement.
Since uhs mode, including SDR50 etc, only takes effective when 1.8v
singaling Enbale is set, which requires controller send out 1.8v io
voltage.
So only set 1.8v singaling Enbale at the condition host support 1.8v.
>
>>> [ 11.688964] mmc0: Timeout waiting for hardware interrupt.
>>> [ 11.688976] sdhci: =========== REGISTER DUMP (mmc0)===========
>>> [ 11.705024] sdhci: Sys addr: 0x00000000 | Version: 0x00000002
>>> [ 11.739657] sdhci: Blk size: 0x00007008 | Blk cnt: 0x00000000
>>> [ 11.739657] sdhci: Argument: 0x00000000 | Trn mode: 0x00000003
>>> [ 11.756973] sdhci: Present: 0x01fa0000 | Host ctl: 0x00000035
>>> [ 11.791607] sdhci: Power: 0x0000000f | Blk gap: 0x00000000
>>> [ 11.791607] sdhci: Wake-up: 0x00000000 | Clock: 0x00000207
>>> [ 11.808923] sdhci: Timeout: 0x0000000e | Int stat: 0x00000000
>>> [ 11.826241] sdhci: Int enab: 0x02ff000b | Sig enab: 0x02ff000b
>>> [ 11.843558] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
>>> [ 11.860874] sdhci: Caps: 0x25fcc8b2 | Caps_1: 0x00002f77
>>> [ 11.878191] sdhci: Cmd: 0x0000133a | Max curr: 0x00000000
>>> [ 11.895509] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x1f943808
>>> [ 11.912826] sdhci: ===========================================
>>> [ 11.947936] mmc0: new high speed DDR MMC card at address 0001
>>> [ 11.965402] mmcblk0: mmc0:0001 SEM08G 7.39 GiB
>>> [ 11.983931] mmcblk0: retrying using single block read
>>> [ 11.999498] mmcblk0: error -84 transferring data, sector 0, nr 8, card status 0x900
>>> [ 12.022300] end_request: I/O error, dev mmcblk0, sector 0
>>> [ 12.038868] mmcblk0: error -84 transferring data, sector 1, nr 7, card status 0x900
>>> [ 12.061745] end_request: I/O error, dev mmcblk0, sector 1
>>> [ 12.078364] mmcblk0: error -84 transferring data, sector 2, nr 6, card status 0x900
>>> [ 12.101155] end_request: I/O error, dev mmcblk0, sector 2
>>> [ 12.117704] mmcblk0: error -84 transferring data, sector 3, nr 5, card status 0x900
>>> [ 12.140507] end_request: I/O error, dev mmcblk0, sector 3
>>> [ 12.157063] mmcblk0: error -84 transferring data, sector 4, nr 4, card status 0x900
>>> [ 12.179876] end_request: I/O error, dev mmcblk0, sector 4
>>> [ 12.196428] mmcblk0: error -84 transferring data, sector 5, nr 3, card status 0x900
>>> [ 12.219233] end_request: I/O error, dev mmcblk0, sector 5
>>> [ 12.235789] mmcblk0: error -84 transferring data, sector 6, nr 2, card status 0x900
>>> [ 12.258604] end_request: I/O error, dev mmcblk0, sector 6
>>> [ 12.275154] mmcblk0: error -84 transferring data, sector 7, nr 1, card status 0x900
>>> [ 12.297970] end_request: I/O error, dev mmcblk0, sector 7
>>> [ 12.314016] Buffer I/O error on device mmcblk0, logical block 0
>>> [ 12.332239] mmcblk0: retrying using single block read
>>> [ 12.347777] mmcblk0: error -84 transferring data, sector 0, nr 8, card status 0x900
>>> [ 12.370589] end_request: I/O error, dev mmcblk0, sector 0
>>> [ 12.387149] mmcblk0: error -84 transferring data, sector 1, nr 7, card status 0x900
>>> [ 12.409954] end_request: I/O error, dev mmcblk0, sector 1
>>> [ 12.426510] mmcblk0: error -84 transferring data, sector 2, nr 6, card status 0x900
>>> [ 12.449325] end_request: I/O error, dev mmcblk0, sector 2
>>> [ 12.465891] mmcblk0: error -84 transferring data, sector 3, nr 5, card status 0x900
>>> [ 12.488677] end_request: I/O error, dev mmcblk0, sector 3
>>> [ 12.505239] mmcblk0: error -84 transferring data, sector 4, nr 4, card status 0x900
>>> [ 12.528050] end_request: I/O error, dev mmcblk0, sector 4
>>> [ 12.544602] mmcblk0: error -84 transferring data, sector 5, nr 3, card status 0x900
>>> [ 12.567407] end_request: I/O error, dev mmcblk0, sector 5
>>> [ 12.583965] mmcblk0: error -84 transferring data, sector 6, nr 2, card status 0x900
>>> [ 12.606770] end_request: I/O error, dev mmcblk0, sector 6
>>> [ 12.623330] mmcblk0: error -84 transferring data, sector 7, nr 1, card status 0x900
>>> [ 12.646134] end_request: I/O error, dev mmcblk0, sector 7
>>> [ 12.662188] Buffer I/O error on device mmcblk0, logical block 0
>>> [ 12.679810] mmcblk0: unable to read partition table
>>> [ 16.609127] VFS: Cannot open root device "mmcblk0p1" or unknown-block(179,1)
>>> [ 16.630132] Please append a correct "root=" boot option; here are the available partitions:
>>> [ 16.654964] b300 7757824 mmcblk0 driver: mmcblk
>>> [ 16.670806] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,1)
>>> [ 16.695905] [<c002abe8>] (unwind_backtrace+0x0/0x124) from [<c0038518>] (panic+0x6c/0x18c)
>>> [ 16.720516] [<c0038518>] (panic+0x6c/0x18c) from [<c0008d94>] (mount_block_root+0x1c4/0x204)
>>> [ 16.745636] [<c0008d94>] (mount_block_root+0x1c4/0x204) from [<c0008e74>] (mount_root+0xa0/0xc4)
>>> [ 16.771787] [<c0008e74>] (mount_root+0xa0/0xc4) from [<c0008fb4>] (prepare_namespace+0x11c/0x174)
>>> [ 16.798201] [<c0008fb4>] (prepare_namespace+0x11c/0x174) from [<c0008750>] (kernel_init+0x108/0x14c)
>>> [ 16.825393] [<c0008750>] (kernel_init+0x108/0x14c) from [<c00263e0>] (kernel_thread_exit+0x0/0x8)
>>>
>>>
>>>
>
>
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