flashrom April 2015

flashrom@flashrom.org

23 participants
53 discussions

Re: [flashrom] Nec/Renesas 78k0s flash programming?
by Stefan Tauner 03 Apr '15

03 Apr '15

On Mon, 30 Mar 2015 15:56:06 +0000 Riccardo Delpopolo Carciopolo <rdelpopolo(a)gmail.com> wrote: > Hi, > I've used flashrom with pickit2 in past. > I'm a newbie but I'd like to add support for this MCUs by myself. > On Internet exist some parallel programmer but I want to program a 78k0s > flash my with the uart protocol. > We're can I start from? > It requires some vpp pulses to enable the uart programming mode. I don't think that flashrom is the right tool for the job of writing the flash memory of a microcontroller. Usually there are dedicated tools for this... but I guess the 78k0s are not really popular? You can of course use flashrom or at least its serial.c as a base for your tool. The protocol seems to be documented in a public application note: http://documentation.renesas.com/doc/DocumentServer/U17739EJ3V0AN00.pdf I am not sure about pulses thing. AFAICT the flash mode is enabled if FLMD0 is high when reset is released. I am however unsure if the following pulses on the same pin (FLMD0) are to be output by the programmer or are a way for the chip to indicate how it needs to be accessed... the language in the AN is abysmal. I would apply VCC to FLMD0 on reset release with a pull-up resistor and measure if the chip outputs anything on the port... Anyway this is rather off-topic... good luck with your project! -- Kind regards/Mit freundlichen Grüßen, Stefan Tauner

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Re: [flashrom] Linux Raspberry PI B - Spansion FL256S
by Stefan Tauner 02 Apr '15

02 Apr '15

On Thu, 2 Apr 2015 16:16:38 +0200 Pascal de Marichalar <pascal.demarichalar(a)gmail.com> wrote: > Hi, > > I use the latest version of flashrom from github: "flashrom v0.9.8-r1887 on > Linux 3.18.10+ (armv6l)" that I had built on a Raspberry PI B. When I run > the command line "flashrom -p linux_spi:dev=/dev/spidev0.0" to probe a SPI > Flash memory chip soldered on a board (I use a a clip test probe) I get the > message: 'Found Generic flash chip "unknown SPI chip (RDID)" (0 kB, SPI) on > linux_spi.' > The Flash chip is a 32 MB Spansion memory. On the chip is written « > FL256SAIF00 SPANSION ». I have attached the output log from flashrom. Flash chips >16MB are not supported yet, but there are some patches you might want to look at, see http://patchwork.coreboot.org/project/flashrom/list/ -- Kind regards/Mit freundlichen Grüßen, Stefan Tauner

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Linux Raspberry PI B - Spansion FL256S
by Pascal de Marichalar 02 Apr '15

02 Apr '15

Hi, I use the latest version of flashrom from github: "flashrom v0.9.8-r1887 on Linux 3.18.10+ (armv6l)" that I had built on a Raspberry PI B. When I run the command line "flashrom -p linux_spi:dev=/dev/spidev0.0" to probe a SPI Flash memory chip soldered on a board (I use a a clip test probe) I get the message: 'Found Generic flash chip "unknown SPI chip (RDID)" (0 kB, SPI) on linux_spi.' The Flash chip is a 32 MB Spansion memory. On the chip is written « FL256SAIF00 SPANSION ». I have attached the output log from flashrom. Thanks, Best regards, Pascal de Marichalar

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flashrom April 2015