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laforge gerrit-no-reply at lists.osmocom.orglaforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-ccid-firmware/+/16866 ) Change subject: reserve RAM for DFU magic ...................................................................... reserve RAM for DFU magic this changes the linker script so the first word (smallest unit since the data needs to be 4 baty aligned) is not reserved for the RAM section. this allows the application to write any data at this address without the rest of the code messing with the content. since the SRAM is preserved after reset, this allows to share data between firmware. in particular it allows the application to tell the bootloader it should start the flashing procedure. this is already implemented in the osmo-asf4-dfu DFU bootloader. if the application wants to switch to the DFU bootloader, write the DFU magic 0x44465521 (DFU!) at the beginning of RAM at address (uint32_t*)HSRAM_ADDR, and perform a system reset. Change-Id: Ibafd08429b05fd3cab6af060904201db83186a4e --- M sysmoOCTSIM/gcc/gcc/same54n19a_dfu.ld M sysmoOCTSIM/gcc/gcc/same54n19a_flash.ld 2 files changed, 4 insertions(+), 2 deletions(-) Approvals: Jenkins Builder: Verified laforge: Looks good to me, approved diff --git a/sysmoOCTSIM/gcc/gcc/same54n19a_dfu.ld b/sysmoOCTSIM/gcc/gcc/same54n19a_dfu.ld index 7d76cc2..17fc417 100644 --- a/sysmoOCTSIM/gcc/gcc/same54n19a_dfu.ld +++ b/sysmoOCTSIM/gcc/gcc/same54n19a_dfu.ld @@ -36,7 +36,8 @@ MEMORY { rom (rx) : ORIGIN = 0x00000000 + 16K, LENGTH = 0x00080000 - 16K - ram (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00030000 + /* The first word of the RAM is used for the DFU magic */ + ram (rwx) : ORIGIN = 0x20000000 + 4, LENGTH = 0x00030000 - 4 bkupram (rwx) : ORIGIN = 0x47000000, LENGTH = 0x00002000 qspi (rwx) : ORIGIN = 0x04000000, LENGTH = 0x01000000 } diff --git a/sysmoOCTSIM/gcc/gcc/same54n19a_flash.ld b/sysmoOCTSIM/gcc/gcc/same54n19a_flash.ld index 33b8ed9..ce30971 100644 --- a/sysmoOCTSIM/gcc/gcc/same54n19a_flash.ld +++ b/sysmoOCTSIM/gcc/gcc/same54n19a_flash.ld @@ -36,7 +36,8 @@ MEMORY { rom (rx) : ORIGIN = 0x00000000, LENGTH = 0x00080000 - ram (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00030000 + /* The first word of the RAM is used for the DFU magic */ + ram (rwx) : ORIGIN = 0x20000000 + 4, LENGTH = 0x00030000 - 4 bkupram (rwx) : ORIGIN = 0x47000000, LENGTH = 0x00002000 qspi (rwx) : ORIGIN = 0x04000000, LENGTH = 0x01000000 } -- To view, visit https://gerrit.osmocom.org/c/osmo-ccid-firmware/+/16866 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-ccid-firmware Gerrit-Branch: master Gerrit-Change-Id: Ibafd08429b05fd3cab6af060904201db83186a4e Gerrit-Change-Number: 16866 Gerrit-PatchSet: 1 Gerrit-Owner: tsaitgaist <kredon at sysmocom.de> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: laforge <laforge at osmocom.org> Gerrit-MessageType: merged -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20200114/29ada015/attachment.htm>