From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bin Meng Date: Tue, 15 Sep 2015 10:30:58 +0800 Subject: [U-Boot] Galileo instructions In-Reply-To: References: Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Simon, On Tue, Sep 15, 2015 at 10:15 AM, Simon Glass wrote: > Hi Bin, > > On 14 September 2015 at 20:06, Bin Meng wrote: >> >> Hi Simon, >> >> On Tue, Sep 15, 2015 at 9:52 AM, Simon Glass wrote: >> > Hi Bin, >> > >> > On 14 September 2015 at 08:32, Bin Meng wrote: >> >> Hi Simon, >> >> >> >> On Mon, Sep 14, 2015 at 9:59 PM, Bin Meng wrote: >> >>> Hi Simon, >> >>> >> >>> On Mon, Sep 14, 2015 at 8:51 PM, Simon Glass wrote: >> >>>> Hi Bin, >> >>>> >> >>>> On 14 September 2015 at 06:49, Bin Meng wrote: >> >>>>> >> >>>>> Hi Simon, >> >>>>> >> >>>>> On Mon, Sep 14, 2015 at 8:45 PM, Simon Glass wrote: >> >>>>> > Hi Bin, >> >>>>> > >> >>>>> > On 13 September 2015 at 03:28, Bin Meng wrote: >> >>>>> >> Hi Simon, >> >>>>> >> >> >>>>> >> On Sun, Sep 13, 2015 at 5:06 AM, Simon Glass wrote: >> >>>>> >>> Hi Bin, >> >>>>> >>> >> >>>>> >>> I have a Galileo Gen 2 and am trying to get U-Boot to start on it. The >> >>>>> >>> first problem I have is that the schematic says the chip is a W25Q64FV >> >>>>> >>> which I think is an 8MB part, but the image produced is only 1MB. >> >>>>> >> >> >>>>> >> Yes, the board has an 8MB SPI flash, but U-Boot (u-boot.rom) only >> >>>>> >> utilizes the last 1MB. >> >>>>> >> >> >>>>> >>> >> >>>>> >>> Also I know that there is a Gen 1 and a Gen 2. I recall you saying >> >>>>> >>> that U-Boot supports the Gen 2 but can easily support the Gen 1. But >> >>>>> >>> perhaps I have done something wrong. >> >>>>> >>> >> >>>>> >> >> >>>>> >> I've verified U-Boot can boot on both gen1 and gen2 boards. >> >>>>> > >> >>>>> > Thanks. >> >>>>> >> >> >>>>> >>> I downloaded the BSP from here: >> >>>>> >>> >> >>>>> >>> https://downloadcenter.intel.com/download/23197/Intel-Quark-BSP >> >>>>> >>> >> >>>>> >>> File name: Board_Support_Package_Sources_for_Intel_Quark_v1.1.0.7z >> >>>>> >>> Version: 1.1.0 (Latest) >> >>>>> >>> >> >>>>> >>> Date: 03/03/2015 >> >>>>> >>> Size: 2.72 MB >> >>>>> >>> >> >>>>> >>> Any hints? I am using a dediprog em100 with a test clip over the flash chip. >> >>>>> >>> >> >>>>> >> >> >>>>> >> It's not clear to me what issue you got. It looks like there might be >> >>>>> >> some issue for dediporg em100 to handle the rom size mismatch? If this >> >>>>> >> is the case, you can just create an 8MB u-boot.rom with the 1MB >> >>>>> >> version with other 7MB filled up with 0xFFs. >> >>>>> > >> >>>>> > OK I did this and it works, thanks. >> >>>>> >> >>>>> So it's indeed the dediprog em100 cannot handle the rom mismatch? >> >>>>> >> >>>>> > Why don't we just change the ROM size? This point is not mentioned in README.x86. >> >>>>> > >> >>>>> >> >>>>> 1MB is enough for U-Boot. u-boot.rom does not necessarily have to >> >>>>> match the SPI flash size. And on Galileo since there is no Intel ME, >> >>>>> so we don't need to create a whole 8MB rom. This is the same as Intel >> >>>>> CrownBay, which has a 2MB SPI flash, but still 1MB u-boot.rom. >> >>>> >> >>>> What is the benefit of this mismatch? I only see the down-side at >> >>>> present (user confusion, unbootable .rom). >> >>> >> >>> I don't see this as a down-side. Why did you call this as unbootable >> >>> .rom? The Dediprog em100 does not work does not mean it is not >> >>> bootable. The assumption is to program this 1MB u-boot.rom to the last >> >>> 1MB of the SPI flash. Perhaps you need contact Dediprog to fix their >> >>> em100 tool to handle such rom mismatch correctly. Or maybe there is >> >>> some parameter to control such behavior that you are not aware of. I >> >> >> >> I don't have a dediprog em100 tool, but based on the user manual [1] I >> >> found on their website, the em100 tool does support such scenario. If >> >> you check page 22, the 'Configuration Setting' window allows you can >> >> specify the flash offset at which you download the rom file. The >> >> corresponding command line parameter is at page 33, which is '-a >> >> addr'. For example, on Galileo board, you need specify '-a 0x700000' >> >> (I believe). >> > >> > Maybe that is the windows version? My version of the utility does not >> > have that option. >> >> Looks it is the Windows version. So you are using Linux version which >> does not have such feature? It's quite odd if that's the case. >> >> > >> >> >> >>> think this is quite a normal use case, as is exactly the same as other >> >>> architectures, that u-boot.bin does not have to match the flash media >> >>> size. Say on PowerPC BookE processors, the NOR flash media can be 8MB, >> >>> 16MB, but the generated bootable u-boot.bin is 512KB, 1MB, etc (Check >> >>> these Freescale QorIQ boards in U-Boot). Users need program u-boot.bin >> >>> to the last 512KB or 1MB in the NOR flash. >> >>> >> >>> And I don't see this is a confusion. Perhaps all x86 boards you've >> >>> played before require the Intel ME firmware, in which case your >> >>> u-boot.rom MUST match the SPI flash size, but we have to realize Intel >> >>> ME is an optional feature and not every x86 board requires that. I am >> >>> afraid this is a preconceived idea instead of confusion. >> >>> >> >> >> >> And one more use case from my experience FYI, on Intel Bayley Bay >> >> which is a BayTrail based board, and it requires Intel ME, as you see >> >> its u-boot.rom is 8MB which is the same as MinnowMax. But I did a >> >> trick in my debugging, that I changed the rom size to 1MB and remove >> >> the Intel ME Kconfig option from 'menuconfig'. This way I only need >> >> program a 1MB u-boot.rom starting from 0x700000. Only the very first >> >> time I touch this board, I chose to program the complete 8MB >> >> u-boot.rom to the SPI flash. Programming 1MB takes quite less time >> >> than 8MB, not to mention the first 5MB (flash descriptors plus Intel >> >> ME firmware) is always the same. >> > >> > OK I see, but in that case you are building a partial image. This is >> > an optimisation which could be done another way, e.g. by cutting off >> > the top part of the image. >> > >> >> It is not a partial *image*. It is a complete image which can boot on >> the board. It is not working because we programmed (ie: using Dediprog >> sf100) or downloaded (ie: using Dediprog em100) to a wrong place. We >> probably could say it is a partial *rom*, if we specify *rom* >> corresponds to the whole SPI flash. >> >> > I think the .rom file should actually be writen to the ROM as is. To >> > me it seems clearer. Perhaps we should provide another file which is >> >> No, I don't think so. The SPI flash is only the flash media to store >> bootloader, but the bootloader file size does not have to match the >> SPI flash size. The SPI flash can have some places to store kernel >> image, root file system, etc. We cannot create a u-boot.rom which >> occupies all these spaces. >> >> > optimised - e.g. a minimal file like u-boot.rom.min? Also even 1MB is >> > a lot more than you normally need to write - does the flashing tool >> > you use provide options to write a partial image? >> >> Again, it is not a partial *image*. It is a complete *image*. The >> flash tool (I am using Dediprog sf100) supports writing a file to >> whatever flash offset. And I believe, such feature is probably >> supported by all flash tools in the market as it is a very basic and >> common use case. Why are you forcing users to always erase the whole >> SPI flash and program a file which corresponds to the whole SPI flash? >> It is not only SPI flash, but also the case for NOR flash, NAND flash >> programmers that I have ever used. All of these support writing a file >> to a particular flash offset. > > Well since this seems to be what you want, then at least the docs > should be updated to explain this. I think this is a common sense, isn't it? As I said, perhaps there is a preconceived idea on the ROM location. Since preciously all x86 board you've worked on happen to require a u-boot.rom corresponding to whole SPI flash in order to boot (this is required by the chipset implementation, as there is a flash descriptor plus Intel ME firmware needs to be there). But SPI flash is not solely used to store bootloader, just like the case on ARM and PowerPC targets. > > Perhaps it is more confusing because the image goes at the end of the > ROM, not the start. > Well, it seems to me you've been working too much in the ARM world where ARM bootloaders (to be exactly, 1st stage bootloaders) normally starts from flash offset 0 because the reset vector is there. :-) This is always the case for x86 (at the flash end due to x86 reset vector is there), and for PowerPC BookE processors (like IBM/AMCC 4xx, Freescale MPC85xx, QorIQ P/T series). Other PowerPC processors like 603, 83xx have an option to decide where the bootloader should be (ie: they can reside at the start of the flash, just like ARM). I would say this is not a confusion, as this is something defined by the architecture and/or the SoC implementation that we (as U-Boot users) must be aware of. >> >> > >> >> >> >> [1] http://www.dediprog.com/save/79.pdf/to/DP_EM100Pro_user%20manual_V1.3.pdf >> > Regards, Bin