From: Amit Virdi <amit.virdi@st.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 03/25] SPEAr: Place ethaddr write and read within CONFIG_CMD_NET
Date: Mon, 26 Mar 2012 16:53:27 +0530 [thread overview]
Message-ID: <4F7051AF.9080905@st.com> (raw)
In-Reply-To: <201203071421.08705.sr@denx.de>
Hi Stefan,
Sorry for this delayed response, I'm back to office after almost 2 weeks.
On 3/7/2012 6:51 PM, Stefan Roese wrote:
> On Wednesday 07 March 2012 13:03:52 Amit Virdi wrote:
>> From: Vipin KUMAR<vipin.kumar@st.com>
>>
>> ethaddr can be optionally read from i2c memory. So, chip_config command
>> supports reading/writing hw mac id into i2c memory. Placing this code
>> within CONFIG_CMD_NET as this would only be needed when network interface
>> is configured
>>
>> Signed-off-by: Vipin Kumar<vipin.kumar@st.com>
>> Signed-off-by: Amit Virdi<amit.virdi@st.com>
>
> I'm not really sure, why you have this special ethaddr handling in I2C prom
> here at all. Isn't it enough to have the MAC address (ethaddr) stored in the
> U-Boot environment (NOR, NAND, etc)? Why do you need this additional I2C
> stuff? Could you please explain this?
>
Generally MAC addresses are stored in EEPROMs due to two reasons:
1. Special set of command sequences are required to erase data from an
EEPROM
2. EEPROMs are cheaper
As a result, board manufacturers provide an EEPROM memory that contains
MAC address and other vital board parameters. In such case, NAND/NOR
memories may not have ethaddr stored. On SPEAr, I2C is used to access
EEPROM. So this patch is required. Please let me know if I understood
your question correctly and, hence, gave the right answer.
Thanks n Regards
Amit Virdi
next prev parent reply other threads:[~2012-03-26 11:23 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-07 12:03 [U-Boot] [PATCH 00/25] SPEAr: Update platform support for SPEAr3xx/6xx Amit Virdi
2012-03-07 12:03 ` [U-Boot] [PATCH 01/25] SPEAr: Fix ARM relocation support Amit Virdi
2012-03-07 13:11 ` Stefan Roese
2012-03-07 12:03 ` [U-Boot] [PATCH 02/25] SPEAr: Eliminate dependency on Xloader table Amit Virdi
2012-03-07 13:16 ` Stefan Roese
2012-03-07 12:03 ` [U-Boot] [PATCH 03/25] SPEAr: Place ethaddr write and read within CONFIG_CMD_NET Amit Virdi
2012-03-07 13:21 ` Stefan Roese
2012-03-07 13:29 ` Mike Frysinger
2012-03-26 11:23 ` Amit Virdi [this message]
2012-03-26 13:15 ` Wolfgang Denk
2012-03-07 12:03 ` [U-Boot] [PATCH 04/25] SPEAr: Configure network support for spear SoCs Amit Virdi
2012-03-07 13:29 ` Stefan Roese
2012-03-26 11:41 ` Amit Virdi
2012-03-26 11:51 ` Stefan Roese
2012-03-07 12:03 ` [U-Boot] [PATCH 05/25] SPEAr: Add macb driver support for spear310 and spear320 Amit Virdi
2012-03-07 12:03 ` [U-Boot] [PATCH 06/25] SPEAr: Add interface information in initialization Amit Virdi
2012-03-07 12:03 ` [U-Boot] [PATCH 07/25] SPEAr: Add basic arch related support for SPEAr SoCs Amit Virdi
2012-03-07 13:49 ` Stefan Roese
2012-03-12 12:30 ` Amit Virdi
2012-03-07 12:03 ` [U-Boot] [PATCH 08/25] SPEAr: Add configuration options for spear3xx and spear6xx boards Amit Virdi
2012-03-07 13:54 ` Stefan Roese
2012-03-26 12:10 ` Amit Virdi
2012-03-26 12:30 ` Stefan Roese
2012-03-27 5:59 ` Amit Virdi
2012-03-07 12:03 ` [U-Boot] [PATCH 09/25] SPEAr: Remove unused flag (CONFIG_SYS_HZ_CLOCK) Amit Virdi
2012-03-07 13:56 ` Stefan Roese
2012-03-07 12:03 ` [U-Boot] [PATCH 10/25] SPEAr: Change the default environment variables Amit Virdi
2012-03-07 14:03 ` Stefan Roese
2012-03-12 12:38 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 11/25] SPEAr: Initialize SNOR in early_board_init_f Amit Virdi
2012-03-07 14:06 ` Stefan Roese
2012-03-07 12:04 ` [U-Boot] [PATCH 12/25] SPEAr: Enable usb device high speed support Amit Virdi
2012-03-07 14:07 ` Stefan Roese
2012-03-12 12:39 ` Amit Virdi
2012-03-26 12:15 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 13/25] SPEAr: spear usbtty configuration does not use ethernet device Amit Virdi
2012-03-07 14:14 ` Stefan Roese
2012-03-12 13:12 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 14/25] SPEAr: Enable udc and usb-console support only for usbtty configuration Amit Virdi
2012-03-07 14:15 ` Stefan Roese
2012-03-07 12:04 ` [U-Boot] [PATCH 15/25] SPEAr: Enable autoneg for ethernet Amit Virdi
2012-03-07 14:18 ` Stefan Roese
2012-03-27 9:02 ` Amit Virdi
2012-03-27 9:20 ` Stefan Roese
2012-03-27 9:24 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 16/25] SPEAr: Enable dcache for fast file transfer Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 17/25] SPEAr: Enable CONFIG_SYS_FLASH_PROTECTION Amit Virdi
2012-03-07 14:25 ` Stefan Roese
2012-03-27 6:39 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 18/25] SPEAr: Correct the definition of CONFIG_SYS_MONITOR_BASE Amit Virdi
2012-03-07 14:31 ` Stefan Roese
2012-03-27 6:38 ` Amit Virdi
2012-03-27 7:05 ` Stefan Roese
2012-03-27 7:42 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 19/25] SPEAr: Enable CONFIG_SYS_FLASH_EMPTY_INFO macro Amit Virdi
2012-03-07 14:32 ` Stefan Roese
2012-03-27 6:11 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 20/25] SPEAr: Enable ONFI nand flash detection for spear3xx and 6xx and evb Amit Virdi
2012-03-07 14:34 ` Stefan Roese
2012-03-27 6:09 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 21/25] SPEAr: explicitly select clk src for UART Amit Virdi
2012-03-07 14:36 ` Stefan Roese
2012-03-07 12:04 ` [U-Boot] [PATCH 22/25] SPEAr: Correct SoC ID offset in misc configuration space Amit Virdi
2012-03-07 14:36 ` Stefan Roese
2012-03-07 12:04 ` [U-Boot] [PATCH 23/25] SPEAr: Use separate config flags for 3xx and 6xx board files Amit Virdi
2012-03-07 14:38 ` Stefan Roese
2012-03-12 13:57 ` Amit Virdi
2012-03-12 14:17 ` Stefan Roese
2012-03-07 12:04 ` [U-Boot] [PATCH 24/25] cleanup/SPEAr: Remove unnecessary parenthesis Amit Virdi
2012-03-07 14:41 ` Stefan Roese
2012-03-07 14:46 ` Stefan Roese
2012-03-12 13:52 ` Amit Virdi
2012-03-07 12:04 ` [U-Boot] [PATCH 25/25] cleanup/SPEAr: Define configuration flags more elegantly Amit Virdi
2012-03-07 14:42 ` Stefan Roese
2012-03-07 13:15 ` [U-Boot] [PATCH 00/25] SPEAr: Update platform support for SPEAr3xx/6xx Stefan Roese
2012-03-07 13:56 ` Amit Virdi
2012-03-09 7:29 ` Vipin Kumar
2012-03-09 7:47 ` Stefan Roese
2012-03-09 8:47 ` Vipin Kumar
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